Photo 1 of 5
Garmin Forerunner 645 · Photo source
Garmin · Forerunner
Forerunner 645
A 42.5 mm GPS running watch with training metrics, Garmin Pay and a stainless steel bezel.
- Type
- Smart and sports
- Sizes
- 42.5 mm
- Movement
- –
- Power reserve
- –
- Display
- Memory-in-pixel
- Battery
- 7 days
- Water
- 50 m
- GPS
- Single-band
- Weight
- 42.2 g
Specifications
Report a wrong or missing specDisplay
- Case sizes
- 42.5 mm
- Panel
- Memory-in-pixel
- Always-on display
- Yes
- Display detail
- 1.2-inch (30.4 mm) sunlight-readable transflective colour MIP display, 240 x 240 pixels, with five-button control.
- Screen protection
- Chemically strengthened glass.
Health and fitness
- ECG
- No
- Blood oxygen
- No
- Skin temperature
- No
- Sleep apnoea alerts
- No
- High blood pressure alerts
- No
- Body composition
- No
- Fall detection
- No
- Crash detection
- No
- GPS
- Single-band
- Water resistance
- 50 m
- Sensors
- GPS, GLONASS, Garmin Elevate wrist heart rate, barometric altimeter, compass, gyroscope, accelerometer and thermometer.
- Health features
- All-day heart rate, steps, sleep and intensity minutes.
- Fitness features
- Running, indoor running, cycling, pool swimming, skiing and rowing profiles; training status and load, aerobic and anaerobic training effect, VO2 max, recovery time and breadcrumb course guidance. Detailed running dynamics require an HRM strap or Running Dynamics Pod.
Battery and connections
- Battery life (maker's claim)
- Up to 7 days
- Mobile data option
- No
- Works with
- iPhone and Android
- Battery life detail
- Up to seven days in smartwatch mode or 14 hours in GPS mode per the exact model's Garmin specification table. The same page's prose says 12 GPS hours; its table and headline say 14.
- Charging
- Rechargeable battery with Garmin charging cable.
- Connectivity
- Bluetooth, ANT+ and Wi-Fi; Garmin Pay, smart notifications, Connect IQ, LiveTrack and phone music controls. No on-watch music storage.
- Storage
- Stores 200 hours of activity history.
Design
- Weight (lightest version)
- 42.2 g
- Software
- Garmin
- Case materials
- Stainless steel bezel, chemically strengthened glass and silicone band; 5 ATM water rating.
- Size
- 42.5 x 42.5 x 13.5 mm; 42.2 g.
- Bands
- Quick-release 20 mm band; fits wrists 127–204 mm.
- Colours
- Black band with silver-toned bezel.
Pros and cons
Pros
- Training status, load and course guidance
- Wrist heart rate and Garmin Pay
- Light 42.2 g case with replaceable bands
Cons
- No on-watch music storage on this standard model
- Detailed running dynamics require an accessory
Closest rivals
Model | Type | Sizes | Movement | Power reserve | Display | Battery | Water | GPS | Weight | Released |
|---|---|---|---|---|---|---|---|---|---|---|
| Smart and sports | 42.5 mm | – | – | Memory-in-pixel | 7 days | 50 m | Single-band | 42.2 g | 2018 | |
| Smart and sports | 42 mm | – | – | Memory-in-pixel | 7 days | 50 m | Single-band | 38.5 g | Apr 2019 | |
| Smart and sports | 42 mm | – | – | Memory-in-pixel | 7 days | 50 m | Single-band | 38.5 g | Apr 2019 |
Sources
- garmin.com.sg/products/discontinued/forerunner-645-black
- garmin.com/en-GB/blog/garmin-introduces-forerunner-645-music-gps-running-watch-…
Photo: garmin.com.sg
- Garmin Forerunner 645 with black band, front view displaying Garmin Pay: Garmin
- Garmin Forerunner 645 with black band, three-quarter view displaying run statistics: Garmin
- Garmin Forerunner 645 with black band, front view displaying the Run activity: Garmin
- Garmin Forerunner 645 with sandstone band, three-quarter view: Garmin
