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.
Featuring contactless payments that let you buy what you need while on the go — plus advanced running dynamics and performance monitoring tools — this GPS running watch is the instrument you need to refine the performance.
GPS Running Watch with Contactless Payments and Wrist-based Heart Rate :
Garmin Pay™ contactless payment solution¹ lets you make convenient payments with your watch, so you can leave your cash and cards at home (Visa now available; Mastercard coming soon).
Provides advanced running dynamics², including ground contact time balance, stride length, vertical ratio and more.
Uses wrist-based heart rate³ to offer performance monitoring features, including evaluating your current training status.
Connected features4 include smart notifications, automatic uploads to Garmin Connect™ and the ability for others to track your runs with the LiveTrack feature.
Customize with free watch faces, apps and more from our Connect IQ™ store.
Battery life5: up to 7 days in smartwatch mode; 14 hours in GPS mode.
Paying Made Easy :
Always on the run? Feel free to leave your phone and wallet behind.
Forerunner 645 features Garmin Pay contactless payment solution¹, 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.
Tune up Your Training :
We’re making it easier to get the data you need to improve your form.
Let Forerunner 645 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 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 7 days and compares it to the optimal range for your fitness and recent training history.
More Ways to Customize :
Check out our Connect IQ store, where you can add personality to Forerunner 645 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.
Stay Connected on the Run :
Forerunner 645 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.
Share and Compete :
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™ Mobile app.
Train Your Way :
Your routine is anything but routine.
Forerunner 645 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.
Love the Look :
Designed for runners, Forerunner 645 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 14 hours in GPS mode, Forerunner 645 is the running partner that can keep up with you.
Lens Material : chemically strengthened glass
Bezel Material : stainless steel
Quick Release Bands : Yes (20 mm, Industry standard)
Strap material : silicone
Physical size : 42.5 x 42.5 x 13.5 mm (Fits wrists with a circumference of 127-204 mm)
Weight : 41.8 g
Water rating : 5 ATM
Display type : sunlight-visible, transflective memory-in-pixel (MIP)
Display size : 1.2” (30.4 mm) diameter
Display resolution : 240 x 240 pixels
Color display : Yes
Battery life :
Smartwatch Mode : Up to 7 days
GPS mode : Up to 14 hours
Memory/History : 200 hours of activity data
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
GPS : Yes
GLONASS : Yes
Garmin Elevate™ wrist heart rate monitor : Yes
Barometric altimeter : Yes
Compass : Yes
Gyroscope : Yes
Accelerometer : Yes
Thermometer : Yes
Daily Smart Features :
Connectivity : Bluetooth®, ANT+®, Wi-Fi®
Connect IQ™ (downloadable watch faces, data fields, widgets and apps) : Yes
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® and Android™
Compatible with Garmin Connect™ Mobile : Yes
Garmin Pay™ : 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
Fitness Age : Yes (in app)
Fitness Equipment/Gym :
Preloaded gym activity profiles : Strength Training, Cardio Training, 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
V02 max : Yes
Training Status (lets you see if you’re training effectively by tracking your training history and fitness level trend.) : Yes
Training Load (your total training load for the last 7 days calculated from estimated EPOC) : Yes
Training Effect (aerobic) : Yes
Training Effect (anaerobic) : Yes
Customizable alerts : Yes
Audio prompts : Yes
Finish time : Yes
Virtual Partner : Yes
Race an Activity : Yes
Course guidance : Yes
Segments (Live, Garmin) : Yes
Strava features (Beacon, live segments) : Yes
LiveTrack : Yes
Touch and/or button lock : 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
Recovery time : Yes
Auto max HR : Yes
HR Broadcast (broadcasts HR data over ANT+™ to paired devices) : Yes
Running Features :
Preloaded run profiles : Running, Treadmill Running, Indoor Track
GPS-based distance, time and pace : Yes
Running dynamics : Yes
Cadence (provides real-time number of steps per minute) : Yes
Performance condition (after running 6–20 minutes, compares your real-time condition to your average fitness level) : Yes
Run workouts : Yes
Race predictor : Yes
Foot pod capable : Yes
Outdoor Recreation Features :
Preloaded outdoor recreation profiles : Skiing, Snowboarding, XC Skiing, Stand up Paddleboarding, Rowing
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
Vertical speed : Yes
Total ascent/descent : Yes
GPS coordinates : Yes
Cycling Features :
Preloaded cycling profiles : Biking, Indoor Biking
Courses : Yes
Race an activity : Yes
Time/distance alerts (triggers alarm when you reach goal) : Yes
Compatible with Varia Vision™ (head-mounted display) : Yes
Compatible with Varia™ radar (rear-facing radar) : Yes
Compatible with Varia™ lights : Yes
Speed and cadence sensor support (with sensor) : Yes (ANT+® and Bluetooth® Smart)
Swimming Features :
Preloaded swim profiles : Pool 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