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Forerunner® 645

Forerunner® 645

Part Number 010-01863-80
Forerunner® 645 Forerunner® 645 Forerunner® 645 Forerunner® 645

GPS Running Watch with Contactless Payments and Wrist-based Heart Rate

  • 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

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.

 

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 cadencestride lengthground contact time and balancevertical 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™ Mobileapp.

 

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 12 hours in GPS mode, Forerunner 645 is the running partner that can keep up with you.

1View current supported country, payment network and issuing bank information
2When used with Running Dynamics Pod or HRM-Run™ or HRM-Tri™ monitor (sold separately)
3Activity tracking accuracy
4When paired with a compatible smartphone
5Battery life may vary depending on selected performance mode and usage
6Responding capability available for Android™ customers only

The Bluetooth® word mark and logos are registered trademarks owned by Bluetooth SIG, Inc. and any use of such marks by Garmin is under license. Android is a registered trademark of Google Inc.

FirstbeatANT+

General

Lens Material chemically strengthened glass
Bezel Material stainless steel
Quick Release Bands (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 42.2 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  
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  
GPS Time Sync  
Automatic daylight saving time  
Alarm clock  
Timer  
Stopwatch  
Sunrise/sunset times  
Face It™ watch face creator  

Sensors

GPS  
GLONASS  
Garmin Elevate™ wrist heart rate monitor  
Barometric altimeter  
Compass  
Gyroscope  
Accelerometer  
Thermometer  

Daily Smart Features

Connectivity Bluetooth®, ANT+®, Wi-Fi®
Connect IQ™ (downloadable watch faces, data fields, widgets and apps)  
Smart notifications  
Text response/reject phone call with text (Android™ only)  
Calendar  
Weather  
Controls smartphone music  
Find My Phone  
Find My Watch  
VIRB® remote  
Smartphone compatibility iPhone® and Android™
Compatible with Garmin Connect™ Mobile  
Garmin Pay™  

Activity Tracking Features

Step counter  
Move bar (displays on device after a period of inactivity; walk for a couple of minutes to reset it)  
Auto goal (learns your activity level and assigns a daily step goal)  
Sleep monitoring (monitors total sleep and periods of movement or restful sleep)  
Calories burned  
Floors climbed  
Distance traveled  
Intensity minutes  
TrueUp™  
Move IQ™  
Fitness Age (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  
Strength workouts  
Automatic rep counting  

Training, Planning and Analysis Features

GPS speed and distance  
Customizable data pages  
Customizable activity profiles  
Auto Pause®  
Interval training  
Advanced workouts  
Downloadable training plans  
Auto Lap®  
Manual lap  
Virtual Partner  
Configurable lap alerts  
V02 max  
Training Status (lets you see if you’re training effectively by tracking your training history and fitness level trend.)  
Training Load (your total training load for the last 7 days calculated from estimated EPOC)  
Training Effect (aerobic)  
Training Effect (anaerobic)  
Customizable alerts  
Audio prompts  
Finish time  
Race an Activity  
Course guidance  
Segments (Live, Garmin)  
Strava features (Beacon, live segments)  
LiveTrack  
Touch and/or button lock  
Auto scroll  
Activity history on watch  

Heart Rate Features

HR zones  
HR alerts  
HR calories  
% HR max  
% HRR  
Recovery time  
Auto max HR  
HR Broadcast (broadcasts HR data over ANT+™ to paired devices)  

Running Features

Preloaded run profiles Running, Treadmill Running, Indoor Track
GPS-based distance, time and pace  
Running dynamics  
Cadence (provides real-time number of steps per minute)  
Performance condition (after running 6–20 minutes, compares your real-time condition to your average fitness level)  
Run workouts  
Race predictor  
Foot pod capable  

Outdoor Recreation Features

Preloaded outdoor recreation profiles Skiing, Snowboarding, XC Skiing, Stand up Paddleboarding, Rowing
Point-to-point navigation  
Bread crumb trail in real time  
Back to start  
TracBack®  
UltraTrac mode  
Elevation profile  
Distance to destination  
Vertical speed  
Total ascent/descent  
GPS coordinates  

Cycling Features

Preloaded cycling profiles Biking, Indoor Biking
Courses  
Race an activity  
Time/distance alerts (triggers alarm when you reach goal)  
Compatible with Varia Vision™ (head-mounted display)  
Compatible with Varia™ radar (rear-facing radar)  
Compatible with Varia™ lights  
Speed and cadence sensor support (with sensor) (ANT+® and Bluetooth® Smart)

Swimming Features

Preloaded swim profiles Pool Swimming
Pool swim metrics (lengths, distance, pace, stroke count/rate, calories)  
Stroke type detection (freestyle, backstroke, breaststroke, butterfly)  
Swim efficiency (SWOLF)  
Drill logging  
Pool swim workouts  
  • Forerunner 645
  • Charging cable
  • Documentation

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