• Garmin
  • Item no. 010-01863-01
  • 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

  • $400.00
  • Shop now

    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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