idk.dev
Compare
Fenix 8 51mm AMOLED vs Fenix 9 Pro 51mm

Garmin Fenix 8 51mm AMOLED vs Garmin Fenix 9 Pro 51mm

What Fenix 8 51mm AMOLED does better (4) and where Fenix 9 Pro 51mm wins (6) — every spec side by side.

Garmin · 2024Fenix 8 51mm AMOLED

8.9Score

4 advantages≈ $1,100

Higher score

Garmin · 2026Fenix 9 Pro 51mm

8.8Score

6 advantages≈ $1,200

7.5Display7.8

9.4Battery life8.6

8.3Health tracking8.3

8.2Sports & outdoor8.2

3.2Smart features3.2

6.0Build & durability6.0

Dimensions

Size comparison

Fenix 8 51mm AMOLEDFenix 9 Pro 51mm

	Fenix 8 51mm AMOLED	Fenix 9 Pro 51mm	Difference
Height	51 mm	51 mm	=
Width	51 mm	51 mm	=
Thickness	14.7 mm	15.8 mm	−1.1 mm
Weight	102 g	99 g	+3 g

Drawn to the same scale from the official dimensions (front and side).

Why is Fenix 8 51mm AMOLED better than Fenix 9 Pro 51mm?

GPS battery life84 h vs 56 h+50%
GPS battery life (dual-band)62 h vs 45 h+38%
Thickness14.7 mm vs 15.8 mm+7%
Pixel density324 ppi vs 311 ppi+4%

Why is Fenix 9 Pro 51mm better than Fenix 8 51mm AMOLED?

Battery life (smartwatch mode)29 days vs 31 days+7%
Storage32 GB vs 64 GB2×
Screen size1.4″ vs 1.5″+7%
Weight102 g vs 99 g+3%
Resolution (width)454 px vs 466 px+3%
Battery saver mode41 days vs 42 days+2%

Specifications

Side by side

Only differences	Garmin Fenix 8 51mm AMOLED≈ $1,1008.9	Garmin Fenix 9 Pro 51mm≈ $1,2008.8
Design & durability
Case size	51 mm	51 mm
Weight	102 g	99 g
Thickness	14.7 mm	15.8 mm
Height	51 mm	51 mm
Width	51 mm	51 mm
Case material	Titanium	Titanium
Sapphire crystal	Yes	Yes
Lens / cover glass	Corning® Gorilla® Glass or sapphire crystal	sapphire crystal
Strap material	silicone	silicone
Water resistance	10 ATM	10 ATM
Water rating (maker)	10 ATM	10 ATM
Rated dive depth	40 m	40 m
Display
Screen size	1.4″	1.5″
Display technology	AMOLED	AMOLED
Panel	AMOLED	AMOLED
AMOLED / OLED display	Yes	Yes
Touchscreen	Yes	Yes
Resolution (width)	454 px	466 px
Resolution (height)	454 px	466 px
Pixel density	324 ppi	311 ppi
Battery
Battery life (smartwatch mode)	29 days	31 days
Battery life with always-on display	13 days	—
Battery saver mode	41 days	42 days
GPS battery life	84 h	56 h
GPS battery life (dual-band)	62 h	45 h
Battery type	Lithium ion	Lithium ion
Wireless charging	No	No
Charging	Garmin proprietary plug charger	Garmin proprietary plug charger
Health sensors
Optical heart rate	Yes	Yes
Blood oxygen (SpO2)	Yes	Yes
ECG	Yes	Yes
Skin temperature	Yes	Yes
Temperature sensor	Yes	Yes
HRV tracking	Yes	Yes
Sleep tracking	Yes	Yes
Sensors	GPS, GLONASS, Galileo, QZSS, BeiDou, SatIQ technology, Elevate wrist heart rate monitor, Pulse Ox blood oxygen saturation monitor, Barometric altimeter, Compass, Gyroscope, Accelerometer, Thermometer, Ambient light sensor, Depth sensor	GPS, GLONASS, Galileo, QZSS, BeiDou, SatIQ technology, Elevate wrist heart rate monitor, Pulse Ox blood oxygen saturation monitor, Barometric altimeter, Compass, Gyroscope, Accelerometer, Thermometer, Ambient light sensor, Depth sensor
Sports & navigation
Built-in GPS	Yes	Yes
Dual-band GPS	Yes	Yes
Satellite systems	GLONASS, GALILEO, BDS, QZSS	GLONASS, GALILEO, BDS, QZSS
Offline maps	Yes	Yes
Barometric altimeter	Yes	Yes
Compass	Yes	Yes
Multisport / triathlon mode	Yes	Yes
Sport profiles	99	99
Dive mode	Yes	Yes
LED flashlight	Yes	Yes
Connectivity
NFC payments	Yes	Yes
Wi-Fi	Wi-Fi 4	Wi-Fi 4
ANT+ sensors	Yes	Yes
Smart features
Calls from the wrist	Yes	Yes
Speaker	Yes	Yes
Microphone	Yes	Yes
Voice assistant	Yes	Yes
Music on the watch	Yes	Yes
Storage	32 GB	64 GB
Third-party apps	Yes	Yes
Platform
Operating system	Garmin OS	Garmin OS
Platform	Proprietary	Proprietary
Works with	iOS, Android	iOS, Android