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Garmin Forerunner 165 vs Garmin Forerunner 170

Every spec side by side, from each maker's published figures.

Better figure, where one is clearly better

GarminForerunner 165GarminForerunner 170
Overview
ReleasedFebruary 2024May 2026
Display
Case sizes43 mm42.6 mm
PanelOLEDOLED
Always-on displayYesYes
Display detail1.2-inch (30.4 mm diameter) colour AMOLED touchscreen, 390 x 390 pixels; optional always-on display; five physical buttons1.2-inch (30.4 mm diameter) colour AMOLED touchscreen, 390 x 390 pixels; optional always-on display and large-font setting; five physical buttons
Screen protectionChemically strengthened glassChemically strengthened glass
Health and fitness
ECGNoNo
Blood oxygenYesYes
Skin temperatureNoNo
Sleep apnoea alertsNoNo
High blood pressure alertsNoNo
Body compositionNoNo
Fall detectionNoNo
Crash detectionNoNo
GPSSingle-bandSingle-band
Water resistance50 m50 m
SensorsGarmin Elevate wrist heart rate; Pulse Ox; barometric altimeter; compass; accelerometer; thermometer; ambient light sensor; GPS, GLONASS and GalileoGarmin Elevate wrist heart rate; Pulse Ox; barometric altimeter; compass; gyroscope; accelerometer; thermometer; ambient light sensor; thermometer measures activity/ambient temperature, not overnight skin temperature
Health featuresContinuous 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 appContinuous heart rate with high/low alerts; HRV status; Body Battery; stress and respiration; advanced sleep, sleep coach, breathing variations and nap detection; smart wake alarm; Health Snapshot; lifestyle logging; Health Status; women's health tracking via Garmin Connect; no ECG app
Fitness featuresDaily 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)More than 80 sports apps; training readiness, status, load, load focus and recovery time; Garmin running, cycling and strength coaching; daily suggested running workouts and quick workouts; wrist-based running dynamics and running power; ground-contact balance requires a compatible accessory; PacePro and grade-adjusted pace; VO2 max and race predictions; cycling power-meter and Varia radar/light support; pool and open-water swimming; no dedicated triathlon mode; Breadcrumb course navigation, point-to-point navigation, back-to-start and TracBack; elevation profile, future elevation plot and Up Ahead; no full routable offline maps
Safety featuresIncident detection during selected activities, assistance and LiveTrack require a paired compatible smartphone and connectivity; live event sharing is Android-onlyIncident detection during selected activities, assistance and LiveTrack require a paired compatible smartphone; live event sharing is Android-only; screen flashlight, not a separate LED torch
Battery and connections
Battery life (maker's claim)Up to 11 daysUp to 10 days
In low-power modeUp to 20 daysUp to 19 days
Mobile data optionNoNo
Works withiPhone and AndroidiPhone and Android
Storage4 GB4 GB
Battery life detailSmartwatch 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 useSmartwatch up to 10 days, or 4 days with display always on; battery saver smartwatch up to 19 days; GPS-only GNSS up to 20 hours; all-systems GNSS up to 14 hours; actual life depends on enabled features and usage
ChargingGarmin proprietary plug charging/data cable; rechargeable built-in batteryGarmin proprietary plug charging/data cable; rechargeable built-in lithium-ion battery; USB charging temperature 0–45 °C
ConnectivityBluetooth 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 GNSSBluetooth and ANT+; GPS, GLONASS and Galileo; no multi-band GNSS; Garmin Pay contactless payments; Android-only text responses and notification images; Connect IQ apps/watch faces/data fields; Garmin Share; controls smartphone music without offline playback; no Wi-Fi, speaker/microphone calls or cellular connection
Storage4 GB memory/history ; standard model has no offline music player4 GB memory/history; standard Forerunner 170 does not support offline music playback
Design
Weight (lightest version)39 g41 g
SoftwareGarminGarmin
Case materialsFibre-reinforced polymer bezel; chemically strengthened glass; silicone band; 5 ATM water ratingFibre-reinforced polymer bezel; silicone band; chemically strengthened glass; 5 ATM water rating; operating/storage temperature –20–60 °C
Size43 x 43 x 11.6 mm; Garmin lists 39 g without a separate body-only weight42.6 x 42.6 x 11.9 mm; Garmin lists 41 g without a separate body-only weight
Bands20 mm quick-release silicone bands; fits 126–203 mm wristsStandard 20 mm quick-release two-tone silicone band; fits 126–203 mm wrists
ColoursBlack/Slate Grey; Mist Grey/WhitestoneBlack with Black/Amp Yellow band; Whitestone with Whitestone/Cloud Blue band; Teal Green and Red Pink belong to the separate Music model
In the boxForerunner 165; charging/data cable; documentationForerunner 170; charging cable; documentation

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