Garmin Forerunner® 570 - 42mm vs Garmin Forerunner® 645Size, Specs & Wrist Fit Compared
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Garmin
Forerunner® 570 - 42mm (010-02970-00)
Garmin
Forerunner® 645 (010-01863-00)
The Garmin Forerunner® 570 - 42mm and Garmin Forerunner® 645 share a near-identical 42.4mm case, so wrist presence comes down to thickness, lug-to-lug and weight.
The Garmin Forerunner® 570 - 42mm is the slimmer of the two (12.9mm vs 13.5mm), so it slides under a cuff more easily.
Specification Comparison
| Spec | GarminForerunner® 570 - 42mm | GarminForerunner® 645 |
|---|---|---|
| Case Width | 42.4mm | 42.5mm |
| Thickness | 12.9mm | 13.5mm |
| Weight | 42g | 41.8g |
| Shape | Circular | Circular |
| GPS | Yes | Yes |
| Display | AMOLED (optional always-on mode) | — |
| Battery life | Smartwatch mode: Up to 10 days GPS-Only GNSS mode: Up to 18 hours SatIQ (AutoSelect) GNSS mode: Up to 14 hours All-Systems GNSS mode + Multi-Band: Up to 13 hours GPS-Only GNSS mode with music: Up to 9 hours SatIQ (AutoSelect) GNSS mode with music: Up to 8 hours All-Systems GNSS mode + Multi-Band with music: Up to 8 hours See Details | Smartwatch Mode: Up to 7 daysGPS mode: Up to 14 hours |
| Battery type | Lithium ion | — |
| Battery life (smartwatch mode) | Up to 10 days | — |
| Battery saver (customizable low power watch) | Yes | — |
| Body Battery™ energy monitor | Yes | — |
| Released | 2025 | 2018 |
Full Specification Comparison
273 specs| Spec | Garmin Forerunner® 570 - 42mm | Garmin Forerunner® 645 |
|---|---|---|
| Overview | ||
| Family | Garmin | Garmin |
| General | ||
| Battery life | Smartwatch mode: Up to 10 days GPS-Only GNSS mode: Up to 18 hours SatIQ (AutoSelect) GNSS mode: Up to 14 hours All-Systems GNSS mode + Multi-Band: Up to 13 hours GPS-Only GNSS mode with music: Up to 9 hours SatIQ (AutoSelect) GNSS mode with music: Up to 8 hours All-Systems GNSS mode + Multi-Band with music: Up to 8 hours See Details | Smartwatch Mode: Up to 7 daysGPS mode: Up to 14 hours |
| Battery type | Lithium ion | — |
| Display Size | 1.2" (30.4 mm) diameter | 1.2" (30.4 mm) diameter |
| Color display | Yes | Yes |
| Lens Material | Corning® Gorilla® Glass 3 | Corning® Gorilla® Glass 3 |
| Bezel Material | aluminum | stainless steel |
| Memory/History | 8 GB | 200 hours of activity data |
| Strap material | silicone | silicone |
| Charging method | Garmin proprietary plug charger | — |
| Large font option | Yes | — |
| Display resolution | 390 x 390 pixels | 240 x 240 pixels |
| Quick Release bands | yes (20 mm, Industry standard) | yes (20 mm, Industry standard) |
| Built-in speaker/microphone | Yes | — |
| Sensors | ||
| GPS | Yes | Yes |
| QZSS | Yes | — |
| BeiDou | Yes | — |
| Compass | Yes | Yes |
| GLONASS | Yes | Yes |
| Galileo | Yes | Yes |
| Gyroscope | Yes | Yes |
| Thermometer | Yes | Yes |
| Accelerometer | Yes | Yes |
| SatIQ™ Technology | Yes | — |
| Ambient light sensor | Yes | — |
| Barometric altimeter | Yes | Yes |
| Pulse Ox Blood Oxygen Saturation Monitor | Yes | — |
| Garmin Elevate™ wrist heart rate monitor | Yes | Yes |
| Product Info | ||
| Main SKU | 010-02970-00 | 010-01863-00 |
| Product ID | 1463821 | 591311 |
| Product Name | Forerunner® 570 - 42mm | Forerunner® 645 |
| Release Date | 5/15/2025 | 1/9/2018 |
| Product Variation | Slate Gray Aluminum with Translucent Black/Black Band | Black with Stainless Hardware |
| Clock Features | ||
| Timer | Yes | Yes |
| Stopwatch | Yes | Yes |
| Time/date | Yes | Yes |
| Alarm clock | Yes | Yes |
| GPS Time Sync | Yes | Yes |
| Sunrise/sunset times | Yes | Yes |
| Automatic daylight saving time | Yes | Yes |
| Cycling Features | ||
| Courses | Yes | Yes |
| Race an activity | Yes | Yes |
| Power meter compatible | Yes | — |
| Power curve and % FTP workouts | Yes | — |
| Compatible with Varia™ lights | Yes | Yes |
| Compatible with Varia headlight camera | Yes | — |
| Speed and cadence sensor support (w/sensor) | Yes | Yes |
| Bike lap and lap maximum power (with power sensor) | Yes | — |
| Compatible with Varia™ radar (rear-facing radar) | Yes | Yes |
| Compatible with Vector™ and Rally™ (power meters) | Yes | — |
| Compatible with Varia Vision™ (head-mounted display) | Yes | Yes |
| Alerts (triggers alarm when you reach goals including time, distance, heart rate or calories) | Yes | Yes |
| Golfing Features | ||
| PinPointer | Yes | — |
| Handicap scoring | Yes | — |
| Tournament legal | Yes | — |
| Digital scorecard | Yes | — |
| Garmin AutoShot™ | Yes | — |
| Round timer/odometer | Yes | — |
| Auto CourseView updates | Yes | — |
| Yardage to layups/doglegs | Yes | — |
| Hazards and course targets | Yes | — |
| Pairs with Garmin Golf app | Yes | — |
| Green View with manual pin position | Yes | — |
| CT10 Automatic club tracking compatible (requires accessory) | Yes | — |
| Yardage to F/M/B (distance to front, middle and back of green) | Yes | — |
| Stat tracking (strokes, putts per round, greens and fairways hit) | Yes | — |
| Measures shot distance (calculates exact yardage for shots from anywhere on course) | automatic | — |
| Running Features | ||
| Run workouts | Yes | Yes |
| Running power | Yes | — |
| Race predictor | Yes | Yes |
| Foot pod capable | Yes | Yes |
| Running dynamics | Yes | Yes |
| Lactate threshold | Yes | — |
| Grade-adjusted pace | Yes | — |
| Trail run auto climb | Yes | — |
| Performance condition | Yes | Yes |
| Run/Walk/Stand detection | Yes | — |
| Stride length (real time) | Yes | — |
| PacePro™ Pacing Strategies | Yes | — |
| Projected race time and pace | Yes | — |
| Vertical oscillation and ratio | Yes | — |
| Ground contact time and balance | yes (GCT balance with accessory) | — |
| GPS-based distance, time and pace | Yes | Yes |
| Course- and weather-specific race predictor | Yes | — |
| Cadence (provides real-time number of steps per minute) | Yes | Yes |
| What You'll Love | ||
| Touchscreen | Yes | — |
| Display type | AMOLED (optional always-on mode) | — |
| Water rating | 5 ATM | — |
| Garmin Pay™ | Yes | Yes |
| Music storage | Yes | — |
| Multi-band GPS | Yes | — |
| Training status | yes (improved) | Yes |
| Training readiness | Yes | — |
| Pulse Ox blood oxygen | yes (spot-check, and optional all-day acclimation and in sleep) | — |
| Sleep score and insights | Yes | — |
| Battery life (smartwatch mode) | Up to 10 days | — |
| Make calls and send texts via voice | yes (with paired compatible smartphone) | — |
| Activity Profiles | ||
| Gym | Strength, HIIT, Cardio, Elliptical Training, Stair Stepping, Floor Climbing, Indoor Rowing, Jump Roping | Strength, Cardio and Elliptical Training, Stair Stepping, Floor Climbing, Indoor Rowing and Yoga |
| Swim | Pool Swimming, Open Water Swimming | Pool Swimming |
| Cycling | Biking, Road Biking, Mountain Biking, Gravel Biking, Bike Commuting, Bike Touring, eBiking, eMountain Biking, Indoor Biking, Cyclocross, BMX | Biking, Indoor Biking |
| Wellness | Walking, Pilates, Yoga, Indoor Walking, Mobility | — |
| Multisport | Triathlon, Duathlon, Brick, Pool Triathlon, Swimming/Running | — |
| In the ring | Boxing, Mixed Martial Arts | — |
| Team sports | Basketball, Volleyball, Field Hockey, Ice Hockey, Football/Soccer, American Football, Lacrosse, Rugby, Ultimate Disc, Cricket, Softball, Baseball | — |
| On the Water | Stand Up Paddleboarding, Rowing, Kayaking, Fishing, Boating | — |
| Racket sports | Tennis, Pickleball, Badminton, Squash, Table Tennis, Padel, Platform Tennis, Racquetball | — |
| Snow & winter | Skiing, Snowboarding, XC Classic Skiing, XC Skate Skiing, Ice Skating, Snowshoeing | — |
| Indoor running | Treadmill Running, Indoor Track Running, Virtual Running | — |
| Outdoor running | Running, Outdoor Track Running, Trail Running, Ultra Running, Obstacle Racing | — |
| Outdoor recreation | Hiking, Rucking, Mountaineering, Indoor Climbing, Bouldering, Hunting, Horseback Riding, Golfing, Disc Golf, Archery | Skiing, Snowboarding, XC Skiing, Stand up Paddleboarding, Rowing |
| Other activity profiles | Inline skating | — |
| Swimming Features | ||
| Pool swim workouts | Yes | Yes |
| Critical swim speed | Yes | — |
| Time and distance alerts | Yes | — |
| Auto rest (pool swim only) | Yes | — |
| Drill logging (pool swim only) | Yes | Yes |
| Pacing alerts (pool swim only) | Yes | — |
| Countdown start (pool swim only) | Yes | Yes |
| Underwater wrist-based heart rate | Yes | — |
| "Repeat on" rest timer (pool swim only) | Yes | Yes |
| Basic rest timer (up from 0) (pool swim only) | Yes | Yes |
| Stroke type detection (freestyle, backstroke, breaststroke, butterfly) (pool swim only) | Yes | Yes |
| Pool swim metrics (lengths, distance, pace, stroke count, swim efficiency (SWOLF), calories) | Yes | Yes |
| Open-water swim metrics (distance, pace, stroke count/rate, stroke distance, swim efficiency (SWOLF), calories) | Yes | — |
| Heart rate from external HRM (real-time during rests, interval and session stats during rests, and automatic heart rate download post-swim) | yes (with HRM-Swim, HRM-Pro, HRM-Pro Plus or HRM 600) | — |
| Outdoor Recreation | ||
| Up Ahead | Yes | — |
| Auto rest | Yes | — |
| TracBack® | Yes | Yes |
| Back to start | Yes | Yes |
| Fish forecast | yes (via Connect IQ™) | — |
| UltraTrac mode | Yes | Yes |
| Vertical speed | Yes | Yes |
| Area calculation | yes (via Connect IQ™) | — |
| Elevation profile | Yes | Yes |
| Total ascent/descent | Yes | Yes |
| Future elevation plot | Yes | — |
| Distance to destination | Yes | Yes |
| Sun and moon information | Yes | — |
| Point-to-point navigation | Yes | Yes |
| Rest Timer (Ultra Run only) | Yes | — |
| Bread crumb trail in real time | Yes | Yes |
| Barometric trend indicator with Storm Alert | Yes | — |
| GPS coordinates | — | Yes |
| Daily Smart Features | ||
| Stocks | yes (optional Connect IQ app) | — |
| Calendar | Yes | Yes |
| Passcode | Yes | — |
| Connectivity | Bluetooth®, ANT+®, Wi-Fi® | Bluetooth®, ANT+®, Wi-Fi® |
| Garmin Share | Yes | — |
| Find My Phone | Yes | Yes |
| Find My Watch | Yes | Yes |
| Voice command | Yes | — |
| Evening report | Yes | — |
| Morning report | Yes | — |
| Red shift mode | Yes | — |
| Weather forecasts | Yes | Yes |
| Smart Notifications | Yes | Yes |
| Smart trainer control | Yes | — |
| Smartphone compatibility | iPhone®, Android™ | iPhone® and Android™ |
| Controls smartphone music | Yes | Yes |
| On-device Connect IQ™ Store | Yes | — |
| Plays and controls watch music | Yes | — |
| Find My Phone during GPS activity | Yes | — |
| Pairs with Garmin Connect™ Mobile | Yes | Yes |
| Compatible with Garmin Messenger app | Yes | — |
| Battery saver (customizable low power watch) | Yes | — |
| Bluetooth phone calling and voice assistant support | Yes | — |
| Realtime settings sync with Garmin Connect™ mobile | Yes | — |
| View images from notifications on watch (Android™ only) | Yes | — |
| Text response/reject phone call with text (Android™ only) | Yes | Yes |
| Connect IQ™ (downloadable watch faces, data fields and apps) | Yes | Yes |
| VIRB® Remote | — | Yes |
| Activity Tracking Features | ||
| TrueUp™ | Yes | Yes |
| Move IQ™ | Yes | Yes |
| Step counter | Yes | Yes |
| Floors climbed | Yes | Yes |
| Calories burned | Yes | Yes |
| Distance traveled | Yes | Yes |
| Intensity minutes | Yes | Yes |
| Automatic rep counting | Yes | Yes |
| Garmin Connect™ Challenges app | yes (optional Connect IQ app) | yes (optional Connect IQ app) |
| Move alerts (displays on device after a period of inactivity) | Yes | Yes |
| Auto goal (learns your activity level and assigns a daily step goal) | Yes | Yes |
| Workout and Training Plans | ||
| HIIT workouts | Yes | — |
| Yoga workouts | Yes | — |
| Cardio workouts | Yes | Yes |
| Pilates workouts | Yes | — |
| Strength workouts | Yes | Yes |
| Multisport workouts | Yes | — |
| Garmin Cycling Coach | Yes | — |
| Garmin Running Coach | Yes | — |
| Garmin Triathlon Coach | Yes | — |
| Garmin Coach - Strength | Yes | — |
| Garmin Running Coach Experts | Yes | — |
| On-screen workout animations | Yes | — |
| On-screen workout muscle maps | Yes | — |
| Garmin Coach - Prebuilt Cycling Plans | Yes | — |
| Daily Suggested Workout - Cycling (Pace and Heart Rate Based) | Yes | — |
| Daily Suggested Workout - Running (Pace and Heart Rate Based) | Yes | — |
| Health & Wellness Monitoring | ||
| Sleep | yes (advanced) | yes (advanced) |
| Hydration | yes (in Garmin Connect™ and optional Connect IQ™ widget) | yes (in Garmin Connect™ and optional Connect IQ™ widget) |
| Breathwork | Yes | — |
| Meditation | Yes | — |
| Fitness age | Yes | yes (in app) |
| Sleep coach | Yes | — |
| Nap detection | Yes | — |
| All-day stress | Yes | Yes |
| Women's health | yes (in Garmin Connect™ and optional Connect IQ™ widget) | yes (in Garmin Connect™ and optional Connect IQ™ widget) |
| Health snapshot | Yes | — |
| Jet lag adviser | Yes | — |
| Respiration rate | Yes | — |
| Skin temperature | Yes | — |
| Resting heart rate | Yes | Yes |
| Breathing variations | Yes | — |
| Relaxation reminders | Yes | — |
| Abnormal heart rate alerts | yes (high and low) | — |
| Relaxation breathing timer | Yes | Yes |
| Body Battery™ energy monitor | Yes | — |
| Wrist-based heart rate (constant, every second) | Yes | Yes |
| Safety and Tracking Features | ||
| Assistance | Yes | — |
| Live Event Sharing | Android™ Only | — |
| Incident Detection during select activities | Yes | — |
| Incident detection alert on phone for wearables | Yes | — |
| Training, Planning and Analysis Features | ||
| % HRR | Yes | Yes |
| % HR max | Yes | Yes |
| HR zones | Yes | Yes |
| HR alerts | Yes | Yes |
| Shortcuts | Yes | — |
| HRV status | Yes | — |
| Load ratio | Yes | — |
| Manual lap | Yes | Yes |
| Rest timer | Yes | — |
| Auto max HR | Yes | Yes |
| Auto scroll | Yes | Yes |
| Finish time | Yes | Yes |
| HR calories | Yes | Yes |
| Voice alerts | Yes | Yes |
| Custom alerts | Yes | Yes |
| Physio TrueUp | Yes | Yes |
| Recovery time | Yes | Yes |
| Training load | Yes | Yes |
| VO2 Max (Run) | Yes | Yes |
| Course guidance | Yes | Yes |
| Training effect | Yes | Yes |
| Virtual Partner | Yes | Yes |
| Race an Activity | Yes | Yes |
| Advanced workouts | Yes | Yes |
| Interval training | Yes | Yes |
| Race glance/widget | Yes | — |
| Training load focus | Yes | — |
| VO2 Max (Trail Run) | Yes | — |
| GPS speed and distance | Yes | Yes |
| Improved recovery time | Yes | — |
| Configurable lap alerts | Yes | Yes |
| Customizable data pages | Yes | Yes |
| Unified training status | Yes | — |
| Touch and/or button lock | Yes | Yes |
| Activity history on watch | Yes | Yes |
| Multisport auto transition | Yes | — |
| Downloadable training plans | Yes | Yes |
| Training effect (anaerobic) | Yes | Yes |
| Manual multisport activities | Yes | — |
| HRM running pace and distance | Yes | — |
| Heat and altitude acclimation | Yes | — |
| Customizable activity profiles | Yes | Yes |
| Auto Pause® automatic timer halt | Yes | Yes |
| Respiration rate (during exercise) | yes (with compatible accessory) | — |
| Auto Lap® interval tracking feature | Yes | Yes |
| Primary benefit (Training Effect labels) | Yes | — |
| HR broadcast (broadcasts HR data over ANT+® to paired devices) | Yes | Yes |
| Improved interval (includes open repeats, intervals data page, rest screen and auto detection) | Yes | — |
| Garmin Live Segments | — | Yes |
| Strava Live Segments | — | Yes |
| Kid Activity Tracking Features | ||
| Toe-to-Toe™ Challenges app | — | yes (optional Connect IQ Toe-to-Toe™ Challenges app) |
Wrist Fit
Garmin Forerunner® 570 - 42mm
Sits best on wrists ~45–61mm wide (≈ 12.0–16.3cm circumference).
Garmin Forerunner® 645
Sits best on wrists ~45–61mm wide (≈ 12.0–16.3cm circumference).
2D Dimension Schematics
Accurate scale drawings based on case dimensions. Drag to pan, Ctrl+scroll to zoom. Works for every watch regardless of photo availability.
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Frequently Asked Questions
Is the Garmin Forerunner® 570 - 42mm bigger than the Garmin Forerunner® 645?
The Garmin Forerunner® 645 is bigger — 42.5mm vs 42.4mm case width.
Which fits a smaller wrist better, the Garmin Forerunner® 570 - 42mm or the Garmin Forerunner® 645?
The Garmin Forerunner® 570 - 42mm suits wrists around 45–61mm wide, and the Garmin Forerunner® 645 around 45–61mm. The one with the smaller lower bound is the safer pick for a small wrist.
Can I see the Garmin Forerunner® 570 - 42mm and Garmin Forerunner® 645 side by side at true scale?
Yes — the schematics and photos above show both watches at matched scale, and our fit tool overlays each on your wrist width.
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