Garmin Forerunner 245 vs Garmin Forerunner 255

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Forerunner 245 compared with Forerunner 255

	GarminForerunner 245	GarminForerunner 255
Overview
Released
Released	April 2019	June 2022
Display
Case sizes
Case sizes	42 mm	46 mm
Panel
Panel	Memory-in-pixel	Memory-in-pixel
Always-on display
Always-on display	Yes	Yes
Display detail
Display detail	1.2-inch (30.4 mm) transflective colour memory-in-pixel display, 240 x 240 pixels; button-operated.	1.3-inch (33 mm) transflective colour memory-in-pixel display, 260 x 260 pixels; button-operated.
Screen protection
Screen protection	Corning Gorilla Glass 3.	Corning Gorilla Glass 3.
Health and fitness
ECG
ECG	No	No
Blood oxygen
Blood oxygen	Yes	Yes
Skin temperature
Skin temperature	No	No
Sleep apnoea alerts
Sleep apnoea alerts	No	No
High blood pressure alerts
High blood pressure alerts	No	No
Body composition
Body composition	No	No
Fall detection
Fall detection	No	No
Crash detection
Crash detection	No	No
GPS
GPS	Single-band	Dual-band (L1 and L5)
Water resistance
Water resistance	50 m	50 m
Sensors
Sensors	GPS, GLONASS, Galileo, Garmin Elevate wrist heart rate, Pulse Ox, compass and accelerometer.	GPS, GLONASS, Galileo, multi-frequency GNSS, Garmin Elevate wrist heart rate, Pulse Ox, barometric altimeter, compass, gyroscope and accelerometer.
Health features
Health features	Pulse Ox, sleep stages, all-day stress and Body Battery energy monitoring.	Pulse Ox, HRV status, sleep score, all-day stress and Body Battery energy monitoring.
Fitness features
Fitness features	Garmin Coach, VO2 max, training status and load, aerobic and anaerobic training effect, recovery time and running dynamics with a compatible pod or strap; breadcrumb course guidance.	Triathlon and open-water swimming profiles, morning report, race widget, daily suggested workouts, training status and load, recovery time and PacePro; breadcrumb course guidance.
Safety features
Safety features	Incident detection and assistance require a paired smartphone; LiveTrack.	Incident detection and assistance require a paired smartphone; LiveTrack.
Battery and connections
Battery life (maker's claim)
Battery life (maker's claim)	Up to 7 days	Up to 14 days
Mobile data option
Mobile data option	No	No
Works with
Works with	iPhone and Android	iPhone and Android
Battery life detail
Battery life detail	Up to seven days in smartwatch mode or 24 hours in GPS mode.	Up to 14 days in smartwatch mode, 30 hours in GPS-only mode or 16 hours with all-systems multi-band GNSS.
Charging
Charging	Rechargeable lithium-ion battery.	Rechargeable battery with Garmin charging cable.
Connectivity
Connectivity	Bluetooth and ANT+; smart notifications, Connect IQ and phone music controls.	Bluetooth and ANT+; Garmin Pay, Connect IQ, smart notifications and phone music controls. This standard model does not store music.
Design
Weight (lightest version)
Weight (lightest version)	38.5 g (better)	49 g
Software
Software	Garmin	Garmin
Case materials
Case materials	Fibre-reinforced polymer bezel and silicone band; 5 ATM water rating.	Fibre-reinforced polymer bezel and silicone band; 5 ATM water rating.
Size
Size	42.3 x 42.3 x 12.2 mm; 38.5 g.	45.6 x 45.6 x 12.9 mm; 49 g.
Bands
Bands	Quick-release 20 mm band; fits wrists 127–204 mm.	Quick-release 22 mm band; fits wrists 130–205 mm.
Colours
Colours	Black case with slate grey band.	Tidal blue with black bezel.