Garmin Forerunner 55

Works with: iPhone and Android
Display: MIP, 1.04 in
Case sizes: 42 mm
Battery: 14 days
GPS battery: 20 hours
Water resistance: 5 ATM
Weight: 37 g

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Garmin Forerunner 55 at a glance

Battery

Around two weeks

Up to 14 days in smartwatch mode. 20 hours with GPS.
GPS

Built-in GPS

No maps. Runs and rides without your phone.
Display

MIP, 1.04 in

1.04 in.
Health

Heart rate and activity

Heart rate, steps and sleep.
Phone & smart

iPhone and Android

Notifications from your phone.
Build

5 ATM water rating

37 g.

Garmin Forerunner 55 full specifications

Overview

Brand	Garmin
Model	Forerunner 55
Series	Forerunner

Platform & apps

Works with iPhone and Android phones, running Garmin.

It has an app store for extra apps and watch faces.

Operating system	Garmin
Works with	iPhone and Android
Storage	0.032 GB
App store	Yes

Display

A memory-in-pixel screen: always on, easy to read in sunlight and very light on the battery.

1.04 in.

Display type	MIP
Screen size	1.04 in
Resolution	208 x 208
Pixel density	200 ppi
Colour display	Yes
Controls	buttons

Design & durability

A 42 mm case weighing 37 g.

Rated 5 ATM: fine for swimming laps and showers.

Case sizes	42 mm
Case shape	Round
Dimensions	42 x 42 x 11.6 mm
Thickness	11.6 mm
Weight (case)	37 g
Lens	chemically strengthened glass
Band material	silicone
Band width	20 mm
Band fitting	yes (20 mm, Industry standard)
Fits wrists	126-203 mm
Water resistance	5 ATM

Battery

Around two weeks: up to 14 days in smartwatch mode.

With GPS on, up to 20 hours. Makers test with their own settings, so treat these as best-case figures.

Battery (smartwatch mode)	14 days
Battery (GPS)	20 hours
All battery modes	Smartwatch: 14 days; GPS: 20 hours
Charging	proprietary-plug

GPS & navigation

Built-in GPS, so you can record runs and rides without your phone.

GPS	Built-in
Satellite systems	GPS, GLONASS, Galileo

Health & sensors

Tracks heart rate and activity.

For sleep, it offers a nightly sleep score.

Sensors	optical HR, accelerometer
Heart-rate sensor	Garmin Elevate
Heart-rate tracking	24/7
High/low heart-rate alerts	Yes
Respiration rate	Yes
Sleep tracking	Sleep score
Stress tracking	Yes
Energy score	Body Battery
Cycle tracking	Yes

Safety

Has an emergency SOS feature.

SOS works through your paired phone. Live tracking lets friends follow your workouts.

Emergency SOS	Via phone
Incident detection	Yes
Live tracking	Yes

Training

Built for training, with the metrics serious athletes use.

It adds daily suggested workouts.

Auto activity detection	Yes
Swim tracking	Pool
Underwater heart rate	Yes
Training metrics	VO2 max, recovery time, race predictor
Adaptive coaching	Yes
Heart-rate broadcast	Yes
External sensors	ANT+, foot pod, speed/cadence

Smart features

Notifications	Yes
Find my phone	Yes
Find my watch	Yes

Specs compiled from Garmin's product pages and datasheets. Manufacturers revise hardware between versions, so check the version on the box. Spotted an error? Tell us.