Garmin Forerunner 165 vs Garmin Forerunner 945

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Forerunner 165 compared with Forerunner 945

	GarminForerunner 165	GarminForerunner 945
Overview
Released
Released	February 2024	April 2019
Display
Case sizes
Case sizes	43 mm	47 mm
Panel
Panel	OLED	Memory-in-pixel
Always-on display
Always-on display	Yes	Yes
Display detail
Display detail	1.2-inch (30.4 mm diameter) colour AMOLED touchscreen, 390 x 390 pixels; optional always-on display; five physical buttons	1.2-inch (30.4 mm) transflective colour memory-in-pixel display, 240 x 240 pixels, with button controls.
Screen protection
Screen protection	Chemically strengthened glass	Gorilla Glass 3 with DX coating.
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	Single-band
Water resistance
Water resistance	50 m	50 m
Sensors
Sensors	Garmin Elevate wrist heart rate; Pulse Ox; barometric altimeter; compass; accelerometer; thermometer; ambient light sensor; GPS, GLONASS and Galileo	GPS, GLONASS, Galileo, Garmin Elevate wrist heart rate, Pulse Ox, barometric altimeter, compass, gyroscope, accelerometer and thermometer.
Health features
Health features	Continuous heart rate with high/low alerts; HRV status; Body Battery; stress, respiration and blood oxygen; advanced sleep and sleep score; sleep coach and nap detection; Health Snapshot; hydration and women's health tracking; no ECG app	Pulse Ox for sleep and altitude acclimation, advanced sleep, all-day stress and Body Battery energy monitoring.
Fitness features
Fitness features	Daily suggested running workouts and Garmin Coach plans; training effect and recovery time; wrist-based running dynamics and running power; PacePro; VO2 max and race predictions; pool and open-water swimming; running, cycling, strength, HIIT, yoga, Pilates, tennis, pickleball and padel profiles; point-to-point and breadcrumb course navigation, back-to-start and TracBack; no full offline maps or dedicated triathlon mode; no training readiness, load or status (Wareable and Tech Advisor)	Running, cycling, swimming and triathlon profiles; training status and load focus, heat- and altitude-adjusted VO2 max, recovery time, Garmin Coach and full-colour maps with Trendline routing. Full running dynamics require a compatible strap or pod.
Safety features
Safety features	Incident detection during selected activities, assistance and LiveTrack require a paired compatible smartphone and connectivity; live event sharing is Android-only	Incident detection and assistance require a paired smartphone; LiveTrack and Group LiveTrack.
Battery and connections
Battery life (maker's claim)
Battery life (maker's claim)	Up to 11 days	Up to 14 days
In low-power mode
In low-power mode	Up to 20 days	–
Mobile data option
Mobile data option	No	No
Works with
Works with	iPhone and Android	iPhone and Android
Storage
Storage	4 GB	–
Battery life detail
Battery life detail	Smartwatch up to 11 days; battery saver smartwatch up to 20 days; GPS-only up to 19 hours; all-systems GNSS up to 17 hours; actual life depends on display settings, enabled features and use	Up to two weeks in smartwatch mode, 36 hours in GPS mode without music or ten hours with GPS and music.
Charging
Charging	Garmin proprietary plug charging/data cable; rechargeable built-in battery	Rechargeable battery with Garmin charging cable.
Connectivity
Connectivity	Bluetooth and ANT+ ; controls smartphone music without offline playback; no Wi-Fi; Garmin Pay; Connect IQ apps, watch faces and data fields; smart notifications; Android-only text responses and notification images; Garmin Share and Garmin Messenger; no cellular connection or multi-band GNSS	Bluetooth, ANT+ and Wi-Fi; Garmin Pay, smart notifications and on-watch music storage for up to 1,000 songs.
Storage
Storage	4 GB memory/history ; standard model has no offline music player	–
Design
Weight (lightest version)
Weight (lightest version)	39 g (better)	50 g
Software
Software	Garmin	Garmin
Case materials
Case materials	Fibre-reinforced polymer bezel; chemically strengthened glass; silicone band; 5 ATM water rating	Fibre-reinforced polymer bezel and silicone band; 5 ATM water rating.
Size
Size	43 x 43 x 11.6 mm; Garmin lists 39 g without a separate body-only weight	47 x 47 x 13.7 mm; 50 g.
Bands
Bands	20 mm quick-release silicone bands; fits 126–203 mm wrists	QuickFit-compatible 22 mm band; fits wrists 130–220 mm.
Colours
Colours	Black/Slate Grey; Mist Grey/Whitestone	Black.
In the box
In the box	Forerunner 165; charging/data cable; documentation	–