• Garmin
  • Item no. 010-01863-01
  • $400.00
  • Discontinued

Forerunner® 645

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… See more

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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.

  • 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

  • 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™

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