Product Details
＋Compare Garmin Forerunner 645, Versus FR935, Fenix 5 & FR735
So what is so special about the Forerunner 645M and how does it compare to the Forerunner 935 (the Fenix 5 is essentially the same watch as the 935 features wise) and 735? It may be a very simple reason why you want to buy the 645M or maybe a simple reason why the other units may be better suited for you.
Do you like to listen to music without having to carry your phone or MP3 player with you while you are doing your activities? Well the Forerunner 645M has built in storage, 3.5 GB, for music, audiobooks and podcasts. All you need is a compatible Bluetooth headset and you are good to go.
Do you hate carrying around money or credit cards while you are out running? The 645M has Garmin Pay so now you only need your watch to pay for things.
Why would the or be the better option? If you want to do multi sport, open water swimming or ultra-marathons.
Here is a brief breakdown on what you gain/lose between the 3 models
Feature |
Forerunner 645M |
Forerunner 735 |
Forerunner 935 |
GPS Battery |
12 hours / 5 with music |
14 |
24 |
Weight |
1.5 oz |
1.4 oz |
1.7 oz |
Dimensions |
1.7" x 1.7" x .5" |
1.75" x 1.75" x .47" |
1.8" x 2.1" .5" |
Wi-Fi connectivity |
Yes |
No |
Yes |
Barometric Altimeter |
Yes |
No |
Yes |
Music |
Yes |
No |
No |
Garmin Pay |
Yes |
No |
No |
Floors Climbed |
Yes |
No |
Yes |
Multi-Sport |
No |
Yes |
Yes |
Open Water Swimming |
No |
Yes |
Yes |
Golf |
No |
No |
Yes |
Anaerobic Training Effect |
Yes |
No |
Yes |
Training Status |
Yes |
No |
Yes |
Training Load |
Yes |
No |
Yes |
FTP |
No |
Yes |
Yes |
Bike Power |
No |
Yes |
Yes |
Cycling Dynamics |
No |
Yes |
Yes |
Shimano Di2 |
No |
Yes |
Yes |
HRM-Swim Support |
No |
Yes |
Yes |
Cost |
$449.99 |
$349.99 |
$499.99 |
Ca Residents: for Proposition 65 warning
There also is a Forerunner 645 version that does not have music that retails for $399.99 but for only $50 for the added music option, why not go for the 645M?
GPS Running Watch with Music and Contactless Payments
- Easily download up to 500 songs to your watch, and connect with Bluetooth headphones (sold separately) for phone-free listening. (Music version only)
- Syncs music from select streaming services for offline listening (Music version only)
- Garmin Pay contactless payment solution lets you make convenient payments with your watch, so you can leave your cash and cards at home.
- Provides advanced running dynamics, including ground contact time balance, stride length, vertical ratio and more.
- Uses wrist-based heart rate to offer performance monitoring features, including evaluating your current training status.
- Battery life: up to 7 days in smartwatch mode; 5 hours in GPS mode with music
Running is more than just exercise — it’s a performance. And Forerunner 645 has the tools to help you put on an outstanding show every time you lace up your shoes.
It features on-device music storage (music version only) — so you can run with your favorite tunes — and contactless payments that let you buy what you need without missing a beat.
With all those features plus advanced running dynamics and performance monitoring tools, this GPS running watch is the instrument you need to refine the performance.
Sandstone only available in non-music version, Cerise only available in music version.
Full Features:
BUILT-IN MUSIC: Easily download up to 500 songs directly from your computer or download offline playlists from select streaming services, including iHeartRadio, Deezer and more. Once the playlist is loaded, pair the 645 Music with a set of compatible Bluetooth® headphones (sold separately) and go. (Music Version Only)
GARMIN PAY: Garmin Pay contactless payment solution1 lets you make convenient payments with your watch, so you can leave your cash and cards at home.
STYLISTIC DESIGN: With the introduction of the 645 Music, the sporty style of the Forerunner line is getting a sophisticated makeover; the metal bezel, chemically strengthened glass and interchangeable bands make it easy to wear all day, every day.
RUNNING DYNAMICS: Perfect your running form with detailed running dynamics3 such as ground contact time balance, vertical ratio, stride length and more.
TRAINING STATUS: A performance monitoring tool automatically evaluates your recent exercise history and performance indicators to let you know if you’re training productively, peaking or overreaching.
CONNECTED FEATURES: Includes smart notifications plus the ability to send prewritten responses to text messages, automatic uploads to Garmin Connect and the ability for others to track your runs with the LiveTrack feature.
CONNECT IQ: Get free watch faces, widgets and apps from Connect IQ so you know when your Uber is arriving, can turn on the lights with the SmartThings app and more.
24/7 HR MONITORING: Garmin Elevate wrist heart rate technology gives you all-day heart rate monitoring at the wrist2.
GPS/GLONASS: Track even better in more challenging environments than GPS alone.
WELLNESS MONITORING: Features all-day stress tracking and relaxation-based breathing timer to help balance stress and rest.
BUILT-IN SPORTS: The running sports are just the beginning because there is also built-in support for cycling, pool swimming, row, elliptical, cardio and more.
CUSTOM WORKOUTS: Download or create your own custom running, cycling, cardio or strength workouts, and download them to your watch.
GARMIN CONNECT: Garmin Connect is an online community where people can connect and compete by joining challenges, encourage each other’s successes and share triumphs via social media. Garmin Connect is free and available on your smartphone with the Garmin Connect Mobile app.
BATTERY LIFE: Up 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.
