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.
Paying Made Easy
Always on the run? Feel free to leave your phone and wallet behind. Forerunner 645 features Garmin Pay contactless payment solution, 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 measurements, 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 respond 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
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.
Track Your Cycle
Get a better understanding of your body using the Garmin Connect menstrual cycle tracking feature. Use it to track cycle details, log physical and emotional symptoms and record personal notes for regular, irregular and menopause transition cycle types. You’ll get education about training and nutrition during each phase of your current cycle, too. With the Connect IQ app, you’ll get cycle updates — such as period reminders, cycle details and symptoms logged for the day — delivered to your wrist.
Safety and Tracking Features
Forerunner 645 provides safety and tracking features to help provide a little extra peace of mind for you and your loved ones. If anything should happen — and your watch is paired with your compatible smartphone — hold the light button down until you feel the watch vibrate 3 times. This activates the assistance feature, which discreetly sends a message with your real-time location to your preloaded emergency contacts. That way, help has an easier time finding you. This watch also has incident detection, which automatically sends a message with your real-time location to preloaded emergency contacts if an incident is detected during an outdoor walk, run or bike activity.
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GENERAL
LENS MATERIAL
Corning® Gorilla® Glass 3
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
DISPLAY SIZE
1.2" (30.4 mm) diameter
DISPLAY RESOLUTION
240 x 240 pixels
DISPLAY TYPE
sunlight-visible, transflective memory-in-pixel (MIP)
WEIGHT
41.8g
BATTERY LIFE
Smartwatch Mode: Up to 7 days
GPS mode: Up to 14 hours
WATER RATING
5 ATM
COLOR DISPLAY
MEMORY/HISTORY
200 hours of activity data -
FEATURES
TIME/DATE
GPS TIME SYNC
AUTOMATIC DAYLIGHT SAVING TIME
ALARM CLOCK
TIMER
STOPWATCH
SUNRISE/SUNSET TIMES -
SENSORS
GPS
GLONASS
GALILEO
GARMIN ELEVATE™ WRIST HEART RATE MONITOR
BAROMETRIC ALTIMETER
COMPASS
GYROSCOPE
ACCELEROMETER
THERMOMETER -
DAILY SMART FEATURES
CONNECT IQ™ (DOWNLOADABLE WATCH FACES, DATA FIELDS, WIDGETS AND APPS)
SMART NOTIFICATIONS
TEXT RESPONSE/REJECT PHONE CALL WITH TEXT (ANDROID™ ONLY)
CONNECTIVITY
Bluetooth®, ANT+®, Wi-Fi®
CALENDAR
WEATHER
CONTROLS SMARTPHONE MUSIC
FIND MY PHONE
FIND MY WATCH
VIRB® CAMERA REMOTE
SMARTPHONE COMPATIBILITY
iPhone® and Android™
COMPATIBLE WITH GARMIN CONNECT™ MOBILE
GARMIN PAY™ -
SAFETY AND TRACKING FEATURES
LIVETRACK
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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)
ALL-DAY STRESS TRACKING -
GYM & FITNESS EQUIPMENT
AVAILABLE GYM ACTIVITY PROFILES
Strength, Cardio and 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
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)
CUSTOM ALERTS
AUDIO PROMPTS
FINISH TIME
VIRTUAL PARTNER
RACE AN ACTIVITY
COURSE GUIDANCE
GARMIN LIVE SEGMENTS
STRAVA LIVE SEGMENTS
TOUCH AND/OR BUTTON LOCK
AUTO SCROLL
ACTIVITY HISTORY ON WATCH
PHYSIO TRUEUP -
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
AVAILABLE RUN PROFILES
Running, Treadmill Running, Indoor Track, Trail Running
GPS-BASED DISTANCE, TIME AND PACE
RUNNING DYNAMICS
VERTICAL OSCILLATION AND RATIO (THE DEGREE OF 'BOUNCE' IN YOUR RUNNING MOTION AND THE COST-BENEFIT RATIO WITH STRIDE LENGTH)
(With compatible accessory)
GROUND CONTACT TIME AND BALANCE (SHOWS HOW MUCH TIME, IN THE RUNNING MOTION, YOUR FOOT IS ON THE GROUND RATHER THAN IN FLIGHT AND LETS YOU CHECK YOUR RUNNING SYMMETRY)
(With compatible accessory)
STRIDE LENGTH (REAL TIME)
(With compatible accessory)
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
AVAILABLE 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
AVAILABLE 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 sensors) -
SWIMMING FEATURES
AVAILABLE SWIM PROFILES
Pool Swimming
POOL SWIM METRICS (LENGTHS, DISTANCE, PACE, STROKE COUNT/RATE, SWIM EFFICIENCY (SWOLF), CALORIES)
STROKE TYPE DETECTION (FREESTYLE, BACKSTROKE, BREASTSTROKE, BUTTERFLY) (POOL SWIM ONLY)
DRILL LOGGING (POOL SWIM ONLY)
BASIC REST TIMER (UP FROM 0)
"REPEAT ON" REST TIMER
COUNTDOWN START
POOL SWIM WORKOUTS -
CONNECTIVITY
iPhone®, Android™
