Last Updated on March 14, 2024 by Senior Editor
The Garmin Forerunner 245 is available in two models; the 245 music with onboard music storage capability and the 245 which lacks this feature. Both are outstanding fitness smartwatches featuring lots of fitness tracking features alongside some of the newly added features such as menstrual cycle tracking for women, body battery energy monitor, incidental fall detection, and a pulse ox. monitor that monitors your blood oxygen level. The battery life of these two is also very impressive, as you can get up to 7 days from any of these two. We’re comparing the differences between the Garmin Forerunner 245 vs 245 Music to help you make the right choice.
Garmin Forerunner 245 vs 245 Music: Specifications Compared
| Product Info |
 Garmin Forerunner 245 Specifications, Features and Price |
 Garmin Forerunner 245 Music Specifications, Features and Price |
|---|---|---|
| Price | $339.37 | Original price was: $349.99.$284.00Current price is: $284.00. |
| ABOUT DEVICE | ABOUT DEVICE | ABOUT DEVICE |
| Device name | Garmin Forerunner 245 | Garmin Forerunner 245 Music |
| Device type | Fitness/Sport smartwatch | Fitness/Sport smartwatch |
| Gender | Unisex | Unisex |
| Release date | April, 2019 | April, 2019 |
| Predecessor | Garmin Forerunner 235 | Garmin Forerunner 235 |
| Successor | Garmin Forerunner 255 | Garmin Forerunner 255 |
| Versions | Garmin Forerunner 245, Garmin Forerunner 245 Music | Garmin Forerunner 245, Garmin Forerunner 245 Music |
| BODY | BODY | BODY |
| Dimension | 42.3 x 42.3 x 12.2 mm | 42.3 x 42.3 x 12.2 mm |
| Weight | 38.5 grams | 38.5 grams |
| Shape | Circular | Circular |
| Case material | Fiber-reinforced polymer | Fiber-reinforced polymer |
| Strap material | Silicone | Silicone |
| Bezel material | Fiber-reinforced polymer | Fiber-reinforced polymer |
| Strap size | 20 mm | 20 mm |
| Interchangeable strap | 20mm, Yes | 20mm, Yes |
| Screen protection | Corning Gorilla Glass 3 | Corning Gorilla Glass 3 |
| Water resistance | Yes, 5ATM | Yes, 5ATM |
| Durability test | — | — |
| Swim-proof | Yes, recommended | Yes, recommended |
| Color | Berry, Gray | Aqua, Black, White |
| DISPLAY | DISPLAY | DISPLAY |
| Display size | 1.2 inches | 1.2 inches |
| Display type | LCD, Memory-in-pixel (MIP), transflective | LCD, Memory-in-pixel (MIP), transflective |
| Display resolution | 240 x 240 px | 240 x 240 px |
| Pixel density | 282.8 PPI | 282.8 PPI |
| Always on | Yes | Yes |
| Custom watch face | Yes | Yes |
| Input type | (not touchscreen), 5 Physical buttons | (not touchscreen), 5 Physical buttons |
| CONNECTIVITY | CONNECTIVITY | CONNECTIVITY |
| Bluetooth | ANT+, Bluetooth | ANT+, Bluetooth |
| Bluetooth calling | No | No |
| GPS | Galileo, GLONASS, GPS | Galileo, GLONASS, GPS |
| NFC | No | No |
| Wi-Fi | Yes | Yes |
| MEMORY | MEMORY | MEMORY |
| RAM | — | — |
| ROM | — | 4GB |
| Memory card slot | No | No |
| CELLULAR CONNECTIVITY | CELLULAR CONNECTIVITY | CELLULAR CONNECTIVITY |
| Technology | None | None |
| SIM type | None | None |
| Band | — | — |
| NOTIFICATIONS | NOTIFICATIONS | NOTIFICATIONS |
| SMS alert | Yes | Yes |
| Calls alert | Yes | Yes |
| Email alert | Yes | Yes |
| Event reminder | Yes | Yes |
| Third-party apps alert | Yes | Yes |
| Reply to Notifications | - | - |
| MEDIA | MEDIA | MEDIA |
| Audio | No | mp3/mp4 |
| Bluetooth music | No | Yes |
| Loudspeaker | No | No |
| Microphone | No | No |
| Camera | No | No |
| Radio | No | No |
| SENSORS | SENSORS | SENSORS |
| Sensor(s) | — | — |
| ACTIVITY TRACKING | ACTIVITY TRACKING | ACTIVITY TRACKING |
| Blood oxygen | Yes | Yes |
| Blood Pressure | No | No |
| Calories | Yes | Yes |
| Distance | Yes | Yes |
| ECG tracking | No | No |
| Heart rate monitoring | Yes | Yes |
| Sleep tracking | Yes | Yes |
| Steps | Yes | Yes |
| Floors climbed | No | No |
| Stress | Yes | Yes |
| Fall detection | Yes | Yes |
| Menstrual cycle | Yes | Yes |
| VO2 Max | Yes | Yes |
| Swim-tracking | Yes | Yes |
| Underwater heart rate tracking | Yes | Yes |
| On-screen workout | No | No |
| Sport modes | Yes | Yes |
| BATTERY | BATTERY | BATTERY |
| Battery type | non-removable Lithium-polymer | non-removable Lithium-polymer |
| Battery capacity | — | — |
| Battery life | GPS mode: 24hrs, Smartwatch mode: 7 days | GPS mode: 24hrs, Smartwatch mode: 7 days |
| Charging type | Charging dock | Charging dock |
| Charging time | 1-2 hours | 1-2 hours |
| Solar charging | No | No |
| PLATFORM | PLATFORM | PLATFORM |
| Chipset | — | — |
| CPU | — | — |
| GPU | — | — |
| Operating system | Proprietary OS | Proprietary OS |
| MISC | MISC | MISC |
| Companion app | Garmin Connect | Garmin Connect |
| Compatibility | Android, iOS | Android, iOS |
| Payment system | None | None |
| Voice command | No | No |
| Find my phone | Yes | Yes |
| Box content | Charger, Garmin Forerunner 245, Manual, Straps | Charger, Garmin Forerunner 245 Music, Manual, Straps |
SEE ALSO
Garmin Forerunner 245 vs 245 Music: Fitness Tracking Features
| Garmin Forerunner 245 | Garmin Forerunner 245 Music | |
| Activity Tracking Features Steps counter, floors climbed, fitness age, Move IQ intensity minutes and distanced traveled. | Yes | Yes |
| Body Battery Energy Monitor Lets you see your body’s energy levels throughout the day so you can find the best times for activity and rest. | Yes | Yes |
| Pulse OX Sensor The Pulse Ox sensor gauges your blood oxygen saturation during the day and as you sleep to show how well your body is absorbing oxygen. | Yes | Yes |
| Stress Tracking Helps you find out if you’re having a calm, balanced or stressful day. Relax reminders will even prompt you to do a short breathing activity when you’re feeling stressed. | Yes | Yes |
| Menstrual Cycle Tracking Lets you use the Garmin Connect™ app to track your cycle, log physical and emotional symptoms and learn about training and nutrition during each phase of your cycle. Even get cycle tracking information on your wrist. | Yes | Yes |
| Hydration Tracking Log your daily fluid intake as a reminder to stay hydrated. You can even have an auto goal for hydration that adjusts based on how much sweat you lose during activities — even underwater. | No | No |
| Respiration Tracking See how you’re breathing throughout the day, during sleep and during breath-work and yoga activities. | No | No |
| Advanced Sleep Monitoring Get a full picture of how you’re sleeping, with a breakdown of your light, deep and REM sleep stages as well as Pulse Ox and respiration data | Yes | Yes |
| Heart Rate Tracking The watch constantly samples your heart rate2 and will alert you if it stays high while you’re at rest. It also helps gauge how hard you work during activities even underwater. | Yes | Yes |
| Mindful Breathing When you want to relax or focus, you can start a breath-work activity, and this watch will track your stress and respiration to help you get a better understanding of how you’re breathing. | No | No |
| On-Screen Animated Workout Modes Easy-to-follow, animated cardio, strength, yoga and Pilates workouts come preloaded on the watch, and you can download more from the Garmin Connect app. | No | No |
| Preloaded Workout Modes Track all the ways you move with more than 20 preloaded GPS and indoor sports apps — including walking, running, cycling, pool swimming, golf and more. | Yes | Yes |
| Garmin Coach Get a personal running coach on your wrist, for free, to help you train for your next 5K, 10K or half-marathon. | Yes | Yes |
| Safety and Tracking Features When your watch and phone are paired, your live location can be sent to your contacts manually or — during outdoor activities — automatically with built-in incident detection. Also Livetrack, Group LiveTrack and Live event sharing allow you to invite other to join you in your training. | Yes | Yes |
| Gym & Fitness Equipment Available gym profiles; Strength, Cardio and Elliptical Training, Stair Stepping, Floor Climbing, Indoor Rowing, Pilates and Yoga. | Yes | Yes |
| Training, Planning and Analysis Features Available run profiles; Running, Treadmill Running, Indoor Track Running, Trail Running. GPS speed and distance, customizable activity profiles, advanced training, VO2 Max., heat and altitude acclimation, training load, training effect, auto and manual mutisport activities, Garmin and Strava live segments. | Fewer | Fewer |
| ClimbPro Feature Use ClimbPro ascent planner on downloaded courses to see real-time information on your current and upcoming climbs, including gradient, distance and elevation gain. | No | No |
| Outdoor Recreation Features Outdoor recreational features include hiking, climbing, mountain biking, skiing, snowboarding, XC skiing, stand up paddleboarding, rowing, kayaking, jumpmaster, tactical | Fewer | Fewer |
| Multi-GNSS Support Access multiple global navigation satellite systems (GPS, GLONASS and Galileo) to track in more challenging environments than GPS alone. | Yes | Yes |
| TOPO Maps Preloaded Topographical (TOPO) maps allow you use TOPO maps with Trendline Popularity Routing to find the best routes and navigate your adventures effortlessly | No | No |
| Ski Maps Preloaded Ski maps allow you view run names and difficulty ratings for 2,000 worldwide ski resorts. | No | No |
| Round-trip Routing Enter a distance you want to travel, and get suggested routes that will bring you back to your starting point. Trendline™ popularity routing helps you find the best local paths. | No | No |
| Turn-by-turn Navigation Follow a route or course with help from turn-by-turn directions, which let you know ahead of time when the next turn is coming. | Yes | Yes |
| ABC sensors Navigate your next trail with ABC sensors, including an altimeter for elevation data, barometer to monitor weather and three-axis electronic compass | No | No |
| Running Features Available run profiles include running, treadmill running, indoor track running, trail running | Fewer | Fewer |
| PACEPRO Technology A first-of-its-kind PacePro feature helps keep you on pace with grade-adjusted guidance as you run a course. | No | No |
| Golf Courses Access full-color CourseView maps for more than 41,000 golf courses around the world, and get button targeting and the PlaysLike Distance feature. | No | No |
| Swimming Features Available swimming profiles; pool swimming, open water swimming, swimming/running. Other features include; tracks metrics such as distance, pace, stroke count, stroke distance and SWOLF. | Fewer | Fewer |
| Underwater Wrist-based Heart Rate Tracking Features underwater wrist-based heart rate tracking that helps you manage your swimming intensity. | Yes | Yes |
| Altimeter Floors climbed | No | No |
Garmin Forerunner 245 vs 245 Music: Battery Life
| Forerunner 245 | Forerunner 245 Music |
|
Smartwatch Mode: Up to 7 days GPS mode with music: Up to 6 hours GPS mode without music: Up to 24 hours | Smartwatch Mode: Up to 7 days GPS mode with music: Up to 5 hours GPS mode without music: Up to 14 hours |
Garmin Forerunner 245 vs 245 Music – Which is Better?
From all indications, the Forerunner 245 and 245 Music are two identical smartwatches. These two have the same design, display, and size. The Activity tracking features are also the same.
However, the difference is that the 245 Music comes with a 4GB storage capacity that allows you to store your favorite tracks on the watch. This isn’t possible with the Forerunner 245.
With the 245 Music, you can load your personal music to the watch as well as load from music streaming services such as Spotify, Amazon Music, and Deezer which you can listen to offline using a Bluetooth headphone.
Beyond this, the Forerunner 245 and 245 Music will track your daily activities such as your steps, calories, stress, sleep, and heart rate. These two also have an inbuilt GPS that will allow you to track outdoor activities like routes and locations. The 245 and 245 Music also feature blood oxygen measurement and the ability to detect falls.
Meanwhile, the 245 and 245 can’t count floors and Garmin Pay isn’t supported as there is no NFC.
The 245 Music is a better smartwatch if you want onboard music storage. Otherwise, the Forerunner 245 is a cheaper alternantive.
Garmin Forerunner 235 vs 245
The Forerunner 245 is a newer and more equipped smartwatch than the Forerunner 235, and as such, it’ll cost you more. Yet the Forerunner 235 is still a nice cheaper alternative for keeping tab on your active life.
Garmin Forerunner 235 vs 245: Specifications Compared
| Product Info |
 Garmin Forerunner 235 Specifications, Features and Price |
Garmin Forerunner 245 Specifications, Features and Price |
|---|---|---|
| Price | $22,099.00 | $339.37 |
| ABOUT DEVICE | ABOUT DEVICE | ABOUT DEVICE |
| Device name | Garmin Forerunner 235 | Garmin Forerunner 245 |
| Device type | Fitness/Sport smartwatch | Fitness/Sport smartwatch |
| Gender | Unisex | Unisex |
| Release date | October, 2015 | April, 2019 |
| Predecessor | — | Garmin Forerunner 235 |
| Successor | Garmin Forerunner 245 | Garmin Forerunner 255 |
| Versions | Garmin Fenix 5, Garmin Fenix 5S, Garmin Fenix 5X | Garmin Forerunner 245, Garmin Forerunner 245 Music |
| BODY | BODY | BODY |
| Dimension | 45 x 45 x 11.7 mm | 42.3 x 42.3 x 12.2 mm |
| Weight | 42 grams | 38.5 grams |
| Shape | Circular | Circular |
| Case material | Fiber-reinforced polymer | Fiber-reinforced polymer |
| Strap material | Silicone | Silicone |
| Bezel material | Ceramics | Fiber-reinforced polymer |
| Strap size | 20 mm | 20 mm |
| Interchangeable strap | Yes | 20mm, Yes |
| Screen protection | Chemically strengthened glass | Corning Gorilla Glass 3 |
| Water resistance | Yes, 5ATM | Yes, 5ATM |
| Durability test | — | — |
| Swim-proof | Yes, recommended | Yes, recommended |
| Color | Black, Blue, Gray | Berry, Gray |
| DISPLAY | DISPLAY | DISPLAY |
| Display size | 1.23 inches | 1.2 inches |
| Display type | LCD, Memory-in-pixel (MIP), transflective | LCD, Memory-in-pixel (MIP), transflective |
| Display resolution | 215 x 180 pixels | 240 x 240 px |
| Pixel density | — | 282.8 PPI |
| Always on | Yes | Yes |
| Custom watch face | Yes | Yes |
| Input type | 5 Physical buttons | (not touchscreen), 5 Physical buttons |
| CONNECTIVITY | CONNECTIVITY | CONNECTIVITY |
| Bluetooth | Bluetooth | ANT+, Bluetooth |
| Bluetooth calling | No | No |
| GPS | GLONASS, GPS | Galileo, GLONASS, GPS |
| NFC | No | No |
| Wi-Fi | No | Yes |
| MEMORY | MEMORY | MEMORY |
| RAM | — | — |
| ROM | — | — |
| Memory card slot | No | No |
| CELLULAR CONNECTIVITY | CELLULAR CONNECTIVITY | CELLULAR CONNECTIVITY |
| Technology | None | None |
| SIM type | None | None |
| Band | — | — |
| NOTIFICATIONS | NOTIFICATIONS | NOTIFICATIONS |
| SMS alert | Yes | Yes |
| Calls alert | Yes | Yes |
| Email alert | Yes | Yes |
| Event reminder | Yes | Yes |
| Third-party apps alert | Yes | Yes |
| Reply to Notifications | - | - |
| MEDIA | MEDIA | MEDIA |
| Audio | No | No |
| Bluetooth music | No | No |
| Loudspeaker | No | No |
| Microphone | No | No |
| Camera | No | No |
| Radio | No | No |
| SENSORS | SENSORS | SENSORS |
| Sensor(s) | — | — |
| ACTIVITY TRACKING | ACTIVITY TRACKING | ACTIVITY TRACKING |
| Blood oxygen | — | Yes |
| Blood Pressure | No | No |
| Calories | Yes | Yes |
| Distance | Yes | Yes |
| ECG tracking | No | No |
| Heart rate monitoring | Yes | Yes |
| Sleep tracking | Yes | Yes |
| Steps | Yes | Yes |
| Floors climbed | - | No |
| Stress | Yes | Yes |
| Fall detection | No | Yes |
| Menstrual cycle | No | Yes |
| VO2 Max | Yes | Yes |
| Swim-tracking | Yes | Yes |
| Underwater heart rate tracking | No | Yes |
| On-screen workout | No | No |
| Sport modes | Yes | Yes |
| BATTERY | BATTERY | BATTERY |
| Battery type | non-removable Lithium-polymer | non-removable Lithium-polymer |
| Battery capacity | — | — |
| Battery life | GPS mode: 11hrs, Smartwatch mode: up to 9 days | GPS mode: 24hrs, Smartwatch mode: 7 days |
| Charging type | Charging dock | Charging dock |
| Charging time | 1-2 hours | 1-2 hours |
| Solar charging | No | No |
| PLATFORM | PLATFORM | PLATFORM |
| Chipset | — | — |
| CPU | — | — |
| GPU | — | — |
| Operating system | Proprietary OS | Proprietary OS |
| MISC | MISC | MISC |
| Companion app | Garmin Connect | Garmin Connect |
| Compatibility | Android 5.0+, iOS 11.0+ | Android, iOS |
| Payment system | None | None |
| Voice command | No | No |
| Find my phone | Yes | Yes |
| Box content | Charger, Garmin Forerunner 235, Manual, Straps | Charger, Garmin Forerunner 245, Manual, Straps |
Garmin Forerunner 235 vs 245: Fitness Tracking Features
| Garmin Forerunner 235 | Garmin Forerunner 245 | |
| Activity Tracking Features Steps counter, floors climbed, fitness age, Move IQ intensity minutes and distanced traveled. | Yes | Yes |
| Body Battery Energy Monitor Lets you see your body’s energy levels throughout the day so you can find the best times for activity and rest. | No | Yes |
| Pulse OX Sensor The Pulse Ox sensor gauges your blood oxygen saturation during the day and as you sleep to show how well your body is absorbing oxygen. | No | Yes |
| Stress Tracking Helps you find out if you’re having a calm, balanced or stressful day. Relax reminders will even prompt you to do a short breathing activity when you’re feeling stressed. | Yes | Yes |
| Menstrual Cycle Tracking Lets you use the Garmin Connect™ app to track your cycle, log physical and emotional symptoms and learn about training and nutrition during each phase of your cycle. Even get cycle tracking information on your wrist. | No | Yes |
| Hydration Tracking Log your daily fluid intake as a reminder to stay hydrated. You can even have an auto goal for hydration that adjusts based on how much sweat you lose during activities — even underwater. | No | No |
| Respiration Tracking See how you’re breathing throughout the day, during sleep and during breath-work and yoga activities. | No | No |
| Advanced Sleep Monitoring Get a full picture of how you’re sleeping, with a breakdown of your light, deep and REM sleep stages as well as Pulse Ox and respiration data | Yes | Yes |
| Heart Rate Tracking The watch constantly samples your heart rate2 and will alert you if it stays high while you’re at rest. It also helps gauge how hard you work during activities even underwater. | Yes | Yes |
| Mindful Breathing When you want to relax or focus, you can start a breath-work activity, and this watch will track your stress and respiration to help you get a better understanding of how you’re breathing. | No | No |
| On-Screen Animated Workout Modes Easy-to-follow, animated cardio, strength, yoga and Pilates workouts come preloaded on the watch, and you can download more from the Garmin Connect app. | No | No |
| Preloaded Workout Modes Track all the ways you move with more than 20 preloaded GPS and indoor sports apps — including walking, running, cycling, pool swimming, golf and more. | Yes | Yes |
| Garmin Coach Get a personal running coach on your wrist, for free, to help you train for your next 5K, 10K or half-marathon. | No | Yes |
| Safety and Tracking Features When your watch and phone are paired, your live location can be sent to your contacts manually or — during outdoor activities — automatically with built-in incident detection. Also Livetrack, Group LiveTrack and Live event sharing allow you to invite other to join you in your training. | No, only LiveTrack | Yes |
| Gym & Fitness Equipment Available gym profiles; Strength, Cardio and Elliptical Training, Stair Stepping, Floor Climbing, Indoor Rowing, Pilates and Yoga. | Fewer | More |
| Training, Planning and Analysis Features Available run profiles; Running, Treadmill Running, Indoor Track Running, Trail Running. GPS speed and distance, customizable activity profiles, advanced training, VO2 Max., heat and altitude acclimation, training load, training effect, auto and manual mutisport activities, Garmin and Strava live segments. | Fewer | More |
| ClimbPro Feature Use ClimbPro ascent planner on downloaded courses to see real-time information on your current and upcoming climbs, including gradient, distance and elevation gain. | No | No |
| Outdoor Recreation Features Outdoor recreational features include hiking, climbing, mountain biking, skiing, snowboarding, XC skiing, stand up paddleboarding, rowing, kayaking, jumpmaster, tactical | Fewer | More |
| Multi-GNSS Support Access multiple global navigation satellite systems (GPS, GLONASS and Galileo) to track in more challenging environments than GPS alone. | Yes | Yes |
| TOPO Maps Preloaded Topographical (TOPO) maps allow you use TOPO maps with Trendline Popularity Routing to find the best routes and navigate your adventures effortlessly | No | No |
| Ski Maps Preloaded Ski maps allow you view run names and difficulty ratings for 2,000 worldwide ski resorts. | No | No |
| Round-trip Routing Enter a distance you want to travel, and get suggested routes that will bring you back to your starting point. Trendline™ popularity routing helps you find the best local paths. | No | No |
| Turn-by-turn Navigation Follow a route or course with help from turn-by-turn directions, which let you know ahead of time when the next turn is coming. | No | Yes |
| ABC sensors Navigate your next trail with ABC sensors, including an altimeter for elevation data, barometer to monitor weather and three-axis electronic compass | No | No |
| Running Features Available run profiles include running, treadmill running, indoor track running, trail running | Fewer | More |
| PACEPRO Technology A first-of-its-kind PacePro feature helps keep you on pace with grade-adjusted guidance as you run a course. | No | Yes |
| Golf Courses Access full-color CourseView maps for more than 41,000 golf courses around the world, and get button targeting and the PlaysLike Distance feature. | No | No |
| Swimming Features Available swimming profiles; pool swimming, open water swimming, swimming/running. Other features include; tracks metrics such as distance, pace, stroke count, stroke distance and SWOLF. | No | More |
| Underwater Wrist-based Heart Rate Tracking Features underwater wrist-based heart rate tracking that helps you manage your swimming intensity. | No | Yes |
| Altimeter Floors climbed | No | No |
Garmin Forerunner 235 vs 245: Battery Life
| Forerunner 235 | Forerunner 245 |
| Smartwatch Mode: Up to 9 days GPS mode: Up to 11 hours | Smartwatch Mode: Up to 7 days GPS mode: Up to 24 hours |
Garmin Forerunner 45 vs 245
The Forerunner 45 is a cheaper GPS-running smartwatch that’s very fitness-focused and loaded with lots of features. It also has a decent battery life. The 45 has a lot of features in common with the 245, although, the 245 is a more equipped smartwatch. Compare these two to find out the differences.
Garmin Forerunner 45 vs 245: Specifications Compared
| Product Info |
 Garmin Forerunner 45 Specifications, Features and Price |
Garmin Forerunner 245 Specifications, Features and Price |
|---|---|---|
| Price | Original price was: $189.00.$179.00Current price is: $179.00. | $339.37 |
| ABOUT DEVICE | ABOUT DEVICE | ABOUT DEVICE |
| Device name | Garmin Forerunner 45 | Garmin Forerunner 245 |
| Device type | Fitness/Sport smartwatch | Fitness/Sport smartwatch |
| Gender | Unisex | Unisex |
| Release date | April, 2019 | April, 2019 |
| Predecessor | Garmin Forerunner 35 | Garmin Forerunner 235 |
| Successor | Garmin Forerunner 55 | Garmin Forerunner 255 |
| Versions | Garmin Forerunner 45, Garmin Forerunner 45S | Garmin Forerunner 245, Garmin Forerunner 245 Music |
| BODY | BODY | BODY |
| Dimension | 42 x 42 x 11.4 mm | 42.3 x 42.3 x 12.2 mm |
| Weight | 36 grams | 38.5 grams |
| Shape | Circular | Circular |
| Case material | Fiber-reinforced polymer | Fiber-reinforced polymer |
| Strap material | Silicone | Silicone |
| Bezel material | Fiber-reinforced polymer | Fiber-reinforced polymer |
| Strap size | 20 mm | 20 mm |
| Interchangeable strap | 20mm, Yes | 20mm, Yes |
| Screen protection | Chemically strengthened glass | Corning Gorilla Glass 3 |
| Water resistance | Yes, 5ATM | Yes, 5ATM |
| Durability test | — | — |
| Swim-proof | Yes | Yes, recommended |
| Color | Black, Red | Berry, Gray |
| DISPLAY | DISPLAY | DISPLAY |
| Display size | 1.04 inches | 1.2 inches |
| Display type | LCD, Memory-in-pixel (MIP), transflective | LCD, Memory-in-pixel (MIP), transflective |
| Display resolution | 208 x 208 pixels | 240 x 240 px |
| Pixel density | 282.8 PPI | 282.8 PPI |
| Always on | Yes | Yes |
| Custom watch face | Yes | Yes |
| Input type | (not touchscreen), 5 Physical buttons | (not touchscreen), 5 Physical buttons |
| CONNECTIVITY | CONNECTIVITY | CONNECTIVITY |
| Bluetooth | Bluetooth | ANT+, Bluetooth |
| Bluetooth calling | No | No |
| GPS | Galileo, GLONASS, GPS | Galileo, GLONASS, GPS |
| NFC | No | No |
| Wi-Fi | No | Yes |
| MEMORY | MEMORY | MEMORY |
| RAM | — | — |
| ROM | — | — |
| Memory card slot | No | No |
| CELLULAR CONNECTIVITY | CELLULAR CONNECTIVITY | CELLULAR CONNECTIVITY |
| Technology | None | None |
| SIM type | None | None |
| Band | — | — |
| NOTIFICATIONS | NOTIFICATIONS | NOTIFICATIONS |
| SMS alert | Yes | Yes |
| Calls alert | Yes | Yes |
| Email alert | Yes | Yes |
| Event reminder | Yes | Yes |
| Third-party apps alert | Yes | Yes |
| Reply to Notifications | - | - |
| MEDIA | MEDIA | MEDIA |
| Audio | No | No |
| Bluetooth music | No | No |
| Loudspeaker | No | No |
| Microphone | No | No |
| Camera | No | No |
| Radio | No | No |
| SENSORS | SENSORS | SENSORS |
| Sensor(s) | — | — |
| ACTIVITY TRACKING | ACTIVITY TRACKING | ACTIVITY TRACKING |
| Blood oxygen | No | Yes |
| Blood Pressure | No | No |
| Calories | Yes | Yes |
| Distance | Yes | Yes |
| ECG tracking | No | No |
| Heart rate monitoring | Yes | Yes |
| Sleep tracking | Yes | Yes |
| Steps | Yes | Yes |
| Floors climbed | No | No |
| Stress | Yes | Yes |
| Fall detection | Yes | Yes |
| Menstrual cycle | Yes | Yes |
| VO2 Max | Yes | Yes |
| Swim-tracking | Yes | Yes |
| Underwater heart rate tracking | No | Yes |
| On-screen workout | No | No |
| Sport modes | Yes | Yes |
| BATTERY | BATTERY | BATTERY |
| Battery type | non-removable Lithium-polymer | non-removable Lithium-polymer |
| Battery capacity | — | — |
| Battery life | GPS mode: 13hrs, Smartwatch mode: 7 days | GPS mode: 24hrs, Smartwatch mode: 7 days |
| Charging type | Charging dock | Charging dock |
| Charging time | 1-2 hours | 1-2 hours |
| Solar charging | No | No |
| PLATFORM | PLATFORM | PLATFORM |
| Chipset | N/A | — |
| CPU | N/A | — |
| GPU | N/A | — |
| Operating system | Proprietary OS | Proprietary OS |
| MISC | MISC | MISC |
| Companion app | Garmin Connect | Garmin Connect |
| Compatibility | Android, iOS | Android, iOS |
| Payment system | None | None |
| Voice command | No | No |
| Find my phone | Yes | Yes |
| Box content | Charger, Garmin Forerunner 45, Manual, Straps | Charger, Garmin Forerunner 245, Manual, Straps |
Garmin Forerunner 45 vs 245 vs 245 Music: Fitness Tracking Features
| Garmin Forerunner 45 | Garmin Forerunner 245 | Garmin Forerunner 245 Music | |
| Activity Tracking Features Steps counter, floors climbed, fitness age, Move IQ intensity minutes and distanced traveled. | Yes | Yes | Yes |
| Body Battery Energy Monitor Lets you see your body’s energy levels throughout the day so you can find the best times for activity and rest. | Yes | Yes | Yes |
| Pulse OX Sensor The Pulse Ox sensor gauges your blood oxygen saturation during the day and as you sleep to show how well your body is absorbing oxygen. | No | Yes | Yes |
| Stress Tracking Helps you find out if you’re having a calm, balanced or stressful day. Relax reminders will even prompt you to do a short breathing activity when you’re feeling stressed. | Yes | Yes | Yes |
| Menstrual Cycle Tracking Lets you use the Garmin Connect™ app to track your cycle, log physical and emotional symptoms and learn about training and nutrition during each phase of your cycle. Even get cycle tracking information on your wrist. | No | Yes | Yes |
| Hydration Tracking Log your daily fluid intake as a reminder to stay hydrated. You can even have an auto goal for hydration that adjusts based on how much sweat you lose during activities — even underwater. | No | No | No |
| Respiration Tracking See how you’re breathing throughout the day, during sleep and during breath-work and yoga activities. | No | No | No |
| Advanced Sleep Monitoring Get a full picture of how you’re sleeping, with a breakdown of your light, deep and REM sleep stages as well as Pulse Ox and respiration data | Yes | Yes | Yes |
| Heart Rate Tracking The watch constantly samples your heart rate2 and will alert you if it stays high while you’re at rest. It also helps gauge how hard you work during activities even underwater. | Yes | Yes | Yes |
| Mindful Breathing When you want to relax or focus, you can start a breath-work activity, and this watch will track your stress and respiration to help you get a better understanding of how you’re breathing. | No | No | No |
| On-Screen Animated Workout Modes Easy-to-follow, animated cardio, strength, yoga and Pilates workouts come preloaded on the watch, and you can download more from the Garmin Connect app. | No | No | No |
| Preloaded Workout Modes Track all the ways you move with more than 20 preloaded GPS and indoor sports apps — including walking, running, cycling, pool swimming, golf and more. | Yes | Yes | Yes |
| Garmin Coach Get a personal running coach on your wrist, for free, to help you train for your next 5K, 10K or half-marathon. | Yes | Yes | Yes |
| Safety and Tracking Features When your watch and phone are paired, your live location can be sent to your contacts manually or — during outdoor activities — automatically with built-in incident detection. Also Livetrack, Group LiveTrack and Live event sharing allow you to invite other to join you in your training. | Yes | Yes | Yes |
| Gym & Fitness Equipment Available gym profiles; Strength, Cardio and Elliptical Training, Stair Stepping, Floor Climbing, Indoor Rowing, Pilates and Yoga. | Yes | Yes | Yes |
| Training, Planning and Analysis Features Available run profiles; Running, Treadmill Running, Indoor Track Running, Trail Running. GPS speed and distance, customizable activity profiles, advanced training, VO2 Max., heat and altitude acclimation, training load, training effect, auto and manual mutisport activities, Garmin and Strava live segments. | Fewer | More | More |
| ClimbPro Feature Use ClimbPro ascent planner on downloaded courses to see real-time information on your current and upcoming climbs, including gradient, distance and elevation gain. | No | No | No |
| Outdoor Recreation Features Outdoor recreational features include hiking, climbing, mountain biking, skiing, snowboarding, XC skiing, stand up paddleboarding, rowing, kayaking, jumpmaster, tactical | Fewer | More | More |
| Multi-GNSS Support Access multiple global navigation satellite systems (GPS, GLONASS and Galileo) to track in more challenging environments than GPS alone. | Yes | Yes | Yes |
| TOPO Maps Preloaded Topographical (TOPO) maps allow you use TOPO maps with Trendline Popularity Routing to find the best routes and navigate your adventures effortlessly | No | No | No |
| Ski Maps Preloaded Ski maps allow you view run names and difficulty ratings for 2,000 worldwide ski resorts. | No | No | No |
| Round-trip Routing Enter a distance you want to travel, and get suggested routes that will bring you back to your starting point. Trendline™ popularity routing helps you find the best local paths. | No | No | No |
| Turn-by-turn Navigation Follow a route or course with help from turn-by-turn directions, which let you know ahead of time when the next turn is coming. | No | Yes | Yes |
| ABC sensors Navigate your next trail with ABC sensors, including an altimeter for elevation data, barometer to monitor weather and three-axis electronic compass | No | No | No |
| Running Features Available run profiles include running, treadmill running, indoor track running, trail running | Fewer | More | More |
| PACEPRO Technology A first-of-its-kind PacePro feature helps keep you on pace with grade-adjusted guidance as you run a course. | No | Yes | Yes |
| Golf Courses Access full-color CourseView maps for more than 41,000 golf courses around the world, and get button targeting and the PlaysLike Distance feature. | No | No | No |
| Swimming Features Available swimming profiles; pool swimming, open water swimming, swimming/running. Other features include; tracks metrics such as distance, pace, stroke count, stroke distance and SWOLF. | Fewer | More | More |
| Underwater Wrist-based Heart Rate Tracking Features underwater wrist-based heart rate tracking that helps you manage your swimming intensity. | No | Yes | Yes |
| Altimeter Floors climbed | No | No | No |
Garmin Forerunner 45 vs 245 vs 245 Music: Battery Life
| Forerunner 45 | Forerunner 245 | Forerunner 245 Music |
| Smartwatch Mode: Up to 7 days GPS mode: Up to 13 hours | Smartwatch Mode: Up to 7 days GPS mode: Up to 24 hours | Smartwatch Mode: Up to 7 days GPS mode with music: Up to 6 hours GPS mode without music: Up to 24 hours |