Garmin Forerunner 645/645 Music GPS Running Watch

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Garmin Forerunner 645/645 Music GPS Running Watch

The Garmin Forerunner 645 is a full-featured GPS running watch with contactless payments. Choose the Garmin Forerunner 645 Music to get all the features of the 645 plus the ability to carry 500 songs on your wrist!

Tune up your Training

The Forerunner 645 makes it easy to get the data you need to improve your form. Biomechanical measurements¹, 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 will track your distance, pace, stroke count and more.

Monitor Your Performance

Just how effective is your current training plan? Forerunner 645 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 seven days and compares it to the optimal range for your fitness and recent training history.

Paying Made Easy

Always on the run? Feel free to leave your phone and wallet behind. Forerunner 645 features Garmin Pay contactless payment solution,² which lets you pay for purchases with your watch. Use it just about anywhere you can tap your card to pay. A bottle of water here, a bite to eat there — just pay, and keep on moving.


With up to 500 songs worth of music storage built right into your watch, Garmin is 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 services³ 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.

¹ When used with Running Dynamics Pod or HRM-Run™ or HRM-Tri™ monitor (sold separately)
² View current supported country, payment network and issuing bank information
³ May require premium subscription with a third-party music provider


  • Customizable screens
  • Downloadable data via computer, via Wi-Fi, or via your phone’s Bluetooth
  • Connected features when when paired with a Bluetooth Smart Ready phone (compatibility list)
    • Wireless syncing
    • Live tracking
    • GroupTrack
    • Smart notifications
    • Music control
    • Find my phone
    • Weather
    • Find my watch
  • Activity tracking features
    • Step counter
    • Auto goal
    • Move alert
    • Sleep monitoring
    • Floors climbed counter
    • Intensity minutes
    • MoveIQ
  • Swim features
    • Pool swim metrics (lengths, distance, pace, stroke count/rate, calories)
    • Stroke type identification
    • Swim workouts
  • Cycling features 
    • Speed/cadence sensor compatible
    • Varia compatible
  • Running dynamics (require HRM-Run or HRM-Tri monitor)
    • Cadence
    • Vertical oscillation and ratio
    • Ground contact time and balance
    • Stride length
  • Physiological measurements (require heart rate monitor)
    • VO2 max estimate and predicted race times
    • Recovery advisor
    • Resting heart rate
    • Heart rate variability and stress score
    • Performance condition
    • Lactate threshold
  • Ski features
  • Connect IQ compatible
  • Navigate to saved location/back to start
  • Built-in barometer and electronic compass
  • Compatible with optional ANT+ sensors
    • Heart rate monitor
    • HRM-Run monitor
    • HRM-Tri monitor
    • Speed and cadence sensors
    • Foot pod
    • Running Dynamics Pod
    • tempe (temperature sensor)
  • Compatible with optional Bluetooth Smart sensors
    • Heart rate monitor
    • Speed and cadence sensors
    • Foot pod
  • Compatible with optional accessories 
    • Varia lights and radar
    • Varia Vision in-sight display
    • VIRB action cameras (remote functionality)
  • Heart rate broadcast (broadcasts HR data over ANT+™ to paired devices)
  • Backlight
  • Color display
  • Sunlight-visible, transflective memory-in-pixel (MIP)
  • Water resistant to 50 meters (5 ATM) (Swim)
  • Built-in accelerometer (calculates run distance without need for a foot pod)
  • Built-in optical heart rate (measures heart rate without need for a heart rate strap)
  • Garmin Pay


Forerunner 645 (Base Model)

  • Forerunner 645
  • Charging cable
  • Documentation

Forerunner 645 Music

  • Forerunner 645 Music
  • Charging cable
  • Documentation

More Information
SKU: Garmin-Forerunner-645-645-Music-GPS-Running-Watch
Crank Arm Length145 mm
BatteryRechargeable lithium-ion
Dimensions42.5 x 42.5 x 13.5 mm (Fits wrists with a circumference of 127–204 mm)
Display Resolution240 x 240 pixels
Display Size1.2" (30.4 mm) diameter
MaterialLens: chemically strengthened glass, Bezel: stainless steel, Band: silicone
Run TimeUp to 7 days in smartwatch mode and 12 hours in GPS mode. 645 Music gets up to 7 days in smartwatch mode and 5 hours in GPS mode with music.
Weight41.8 g