With up to 500 songs worth of music storage built right into your watch, we’re putting the “beat” in your daily mission to beat yesterday. It’s easy to transfer music from your computer and then queue up your favorite playlist for easy listening through Bluetooth headphones. You can even sync your carefully crafted playlists from select music streaming services¹ to your watch for more ad-free listening. Now you really can leave your phone behind when you head out for a run, because the music that helps keep you moving is right there on your wrist.
We’re making it easier to get the data you need to improve your form. Let Forerunner 645 Music measure crucial running metrics that you can use to analyze your performance. Biomechanical measurements², such as cadence, stride length, ground contact time and balance, vertical oscillation and vertical ratio, are the key to understanding your form so you can bring your best on race day. These metrics are available with the addition of a compatible heart rate strap or the compact Running Dynamics Pod, which clips right onto your waistband. Also, take advantage of feature sets to help with cycling and even swim training. In the pool, Forerunner 645 Music will track your distance, pace, stroke count and more.
Just how effective is your current training plan? Forerunner 645 Music will help you monitor your training and recovery so you can better prepare for a race or training cycle. Training status is a performance monitoring tool that automatically evaluates your recent exercise history and performance indicators to let you know if you’re training productively, peaking or overreaching. The anaerobic training effect metric opens a window of insight to a critical dimension of training, telling you how your training is improving your ability to push the limits. You can even view your overall training load, which measures your exercise volume from the last 7 days and compares it to the optimal range for your fitness and recent training history.
Check out our Connect IQ store, where you can add personality to Forerunner 645 Music by downloading apps, widgets, watch faces and more. It’s easy and — even better — it’s free. New apps are added every day, so you can keep tabs on when your Uber is arriving, turn on your lights at home with the SmartThings app, and even use the AccuWeather MinuteCast app to find out when the rain will start. With the Face It™ watch face app, choose any image from your photo library, make some tweaks, and set it as your watch’s face.
Forerunner 645 Music makes it easy to run without leaving important smart features behind. Once paired with your compatible smartphone, you’ll be able to receive and even respond6 to text messages and see social media updates, emails and more right on your wrist. Find your phone, access music controls, and let friends LiveTrack your runs.
Syncing your activities to Garmin Connect is for more than just storing your data. Garmin Connect is a thriving online community where people on the go can connect and compete by joining challenges, encourage each other’s successes and even share their triumphs via social media. Garmin Connect is free and available on the web or on your smartphone with the Garmin Connect™ Mobileapp.
Your routine is anything but routine. Forerunner 645 Music lets you change things up with ease, thanks to built-in activity profiles for running (indoor/outdoor), cycling (indoor/outdoor), swimming (pool), elliptical, paddle sports, strength training and many more. Create your own custom workouts, and download for free from our Garmin Connect online fitness community. Then review your past efforts on the app, or share them with family and friends for added motivation.
Designed for runners, Forerunner 645 Music features a reliable five-button interface that lets you mark laps with a quick press. Feel free to take this watch outside in all kinds of weather. Not only is it safe for swimming and showering, its Garmin Chroma Display™ is easy to read — even in direct sunlight — and housed under chemically strengthened glass. When you want to change it up, swapping bands is fast and doesn’t require tools. And with up to 7 days of battery life in smartwatch mode and 12 hours in GPS mode, Forerunner 645 Music is the running partner that can keep up with you.
General |
|
Lens Material |
chemically strengthened glass |
---|---|
Bezel Material |
fiber-reinforced polymer |
Case material | fiber-reinforced polymer |
QuickFit™ watch band compatible |
yes (22 mm) |
Strap material |
silicone |
Physical size |
45 x 45 x 15.3 mm |
Display size | custom, two-window design; 0.9” x 0.9” (23 x 23 mm) |
Display resolution | 128 x 128 pixels |
Display type | monochrome, sunlight-visible, transflective memory-in-pixel (MIP) |
Weight |
52 g |
Battery life | Smartwatch mode: Up to 14 days GPS mode: Up to 16 hours UltraTrac™ mode: Up to 40 hours |
Water rating | 10 ATM |
Memory/History | 16 MB |
Clock Features |
|
Time/date | Yes |
---|---|
GPS Time Sync | Yes |
Automatic daylight saving time | Yes |
Alarm clock | Yes |
Timer | Yes |
Stopwatch | Yes |
Sunrise/sunset times | Yes |
Sensors |
|
GPS | Yes |
---|---|
GLONASS | Yes |
Galileo | Yes |
Garmin Elevate™ wrist heart rate monitor | Yes |
Barometric altimeter | Yes |
Compass | Yes |
Accelerometer | Yes |
Thermometer | Yes |
Daily Smart Features |
|
Connectivity | Bluetooth®, ANT+® |
---|---|
Smart notifications | Yes |
Text response/reject phone call with text (Android™ only) | Yes |
Calendar | Yes |
Weather | Yes |
Controls smartphone music | Yes |
Find My Phone | Yes |
Find My Watch | Yes |
VIRB® Camera Remote | Yes |
Smartphone compatibility | iPhone®, Android™ |
Compatible with Garmin Connect™ Mobile | Yes |
Activity Tracking Features |
|
Step counter | Yes |
---|---|
Move bar (displays on device after a period of inactivity; walk for a couple of minutes to reset it) | Yes |
Auto goal (learns your activity level and assigns a daily step goal) | Yes |
Sleep monitoring (monitors total sleep and periods of movement or restful sleep) | Yes |
Calories burned | Yes |
Floors climbed | Yes |
Distance traveled | Yes |
Intensity minutes | Yes |
TrueUp™ | Yes |
Move IQ™ | Yes |
All-day Stress Tracking | Yes |
Fitness Equipment/Gym |
|
Available gym activity profiles | Strength, Cardio and Elliptical Training, Stair Stepping, Floor Climbing, Indoor Rowing and Yoga |
---|---|
Cardio workouts | Yes |
Strength workouts | Yes |
Automatic rep counting | Yes |
Training, Planning and Analysis Features |
|
GPS speed and distance | Yes |
---|---|
Customizable data pages | Yes |
Customizable activity profiles | Yes |
Auto Pause® | Yes |
Interval training | Yes |
Advanced workouts | Yes |
Downloadable training plans | Yes |
Auto Lap® | Yes |
Manual lap | Yes |
Configurable lap alerts | Yes |
Customizable alerts | Yes |
Audio prompts | Yes |
Finish time | Yes |
Virtual Partner | Yes |
Race an Activity | Yes |
Course guidance | Yes |
LiveTrack | Yes |
Touch and/or button lock | Yes |
Hot keys | Yes |
Auto scroll | Yes |
Activity history on watch | Yes |
Heart Rate Features |
|
HR zones | Yes |
---|---|
HR alerts | Yes |
HR calories | Yes |
% HR max | Yes |
% HRR | Yes |
Auto max HR | Yes |
HR Broadcast (broadcasts HR data over ANT+™ to paired devices) | Yes |
Running Features |
|
Available run profiles |
Running, Treadmill Running, Indoor Track Running, Trail Running |
---|---|
GPS-based distance, time and pace | Yes |
Cadence (provides real-time number of steps per minute) | Yes |
Run workouts | Yes |
Foot pod capable | Yes |
Outdoor Recreation Features |
|
Available outdoor recreation profiles |
Hiking, Climbing, Mountain Biking, Skiing, Snowboarding, XC Skiing, Stand Up Paddleboarding, Rowing, Kayaking, Tactical |
---|---|
Point-to-point navigation | Yes |
Bread crumb trail in real time | Yes |
Back to start | Yes |
TracBack® | Yes |
UltraTrac mode | Yes |
Elevation profile | Yes |
Distance to destination | Yes |
Barometric trend indicator with Storm Alert | Yes |
Trail run auto climb | Yes |
Vertical speed | Yes |
Total ascent/descent | Yes |
Future elevation plot | Yes |
Compatible with BaseCamp™ | Yes |
GPS coordinates | Yes |
Projected waypoint | Yes |
Sight 'N Go | Yes |
Area calculation | Yes |
Sun and moon information | Yes |
Dual grid coordinates | Yes |
XERO™ Locations | Yes |
Cycling Features |
|
Available cycling profiles |
Biking, Indoor Biking, Mountain Biking |
---|---|
Courses | Yes |
Race an activity | Yes |
Time/distance alerts (triggers alarm when you reach goal) | Yes |
Speed and cadence sensor support (with sensor) |
yes (ANT+® and Bluetooth® Smart sensors) |
Swimming Features |
|
Available swim profiles |
Pool Swimming, Open Water Swimming |
---|---|
Pool swim metrics (lengths, distance, pace, stroke count/rate, calories) | Yes |
Stroke type detection (freestyle, backstroke, breaststroke, butterfly) | Yes |
Swim efficiency (SWOLF) | Yes |
Drill logging | Yes |
Pool swim workouts | Yes |
Open-water swim metrics (distance, pace, stroke count/rate, stroke distance, calories) | Yes |