Garmin · 2022
Forerunner® 255SSize, Dimensions & Wrist Fit
Case Width
41mm
Thickness
12.4mm
Diameter
41mm
Weight
39g
The Garmin Forerunner® 255S sits best on flat wrist widths of about 43–59mm (≈ 11.5–15.8cm wrist circumference). Adjust the slider below to check your wrist.
Does the Forerunner® 255S fit your wrist?
Drag the slider to your wrist width and see the Forerunner® 255S overlaid at true scale. Lug-to-lug — not case diameter — decides whether a watch overhangs your wrist.
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Garmin Forerunner® 255S Full Specifications
Overview1
FamilyGarmin
General11
Battery life
Smartwatch mode: Up to 12 days
GPS-only GNSS mode: Up to 26 hours
All-Systems GNSS mode: Up to 20 hours
All-Systems GNSS mode plus Multi-Band: Up to 13 hours
See Details
Display Size1.1" (27.5mm) Diameter
Color displayYes
Lens MaterialCorning® Gorilla® Glass 3
Bezel Materialfiber-reinforced polymer
Memory/History4 GB
Strap materialsilicone
Charging methodGarmin proprietary plug charger
Large font optionYes
Display resolution218 x 218 pixels
Quick Release bandsyes (18 mm, Industry standard)
Sensors11
GPSYes
CompassYes
GLONASSYes
GalileoYes
GyroscopeYes
ThermometerYes
AccelerometerYes
SatIQ™ TechnologyYes
Barometric altimeterYes
Pulse Ox Blood Oxygen Saturation MonitorYes
Garmin Elevate™ wrist heart rate monitorYes
Product Info5
Main SKU010-02641-02
Product ID780165
Product NameForerunner® 255S
Release Date6/1/2022
Product VariationPowder Gray
Clock Features7
TimerYes
StopwatchYes
Time/dateYes
Alarm clockYes
GPS Time SyncYes
Sunrise/sunset timesYes
Automatic daylight saving timeYes
Cycling Features11
CoursesYes
Race an activityYes
Power meter compatibleYes
Compatible with Varia™ lightsYes
FTP (Functional Threshold Power)yes (with compatible accessory)
Speed and cadence sensor support (w/sensor)Yes
Bike lap and lap maximum power (with power sensor)Yes
Compatible with Varia™ radar (rear-facing radar)Yes
Compatible with Vector™ and Rally™ (power meters)Yes
Compatible with Varia Vision™ (head-mounted display)Yes
Alerts (triggers alarm when you reach goals including time, distance, heart rate or calories)Yes
Running Features17
Run workoutsYes
Running powerYes
Race predictorYes
Foot pod capableYes
Running dynamicsYes
Lactate thresholdyes (with compatible accessory)
Grade-adjusted paceYes
Trail run auto climbYes
Performance conditionYes
Run/Walk/Stand detectionYes
Stride length (real time)Yes
PacePro™ Pacing StrategiesYes
Vertical oscillation and ratioYes
Ground contact time and balanceYes
GPS-based distance, time and paceYes
Course- and weather-specific race predictorYes
Cadence (provides real-time number of steps per minute)Yes
What You'll Love9
Display type
Sunlight-visible, transflective memory-in-pixel (MIP)
Water rating5 ATM
Garmin Pay™Yes
Multi-band GPSYes
Training statusyes (improved)
Pulse Ox blood oxygen
yes (spot-check, and optional all-day acclimation and in sleep)
Daily suggested workoutsyes (7 days)
Sleep score and insightsYes
Battery life (smartwatch mode)Up to 12 days
Activity Profiles14
Gym
Strength, HIIT, Cardio, Elliptical Training, Stair Stepping, Floor Climbing, Indoor Rowing, Jump Roping
SwimPool Swimming, Open Water Swimming
Cycling
Biking, Mountain Biking, eBiking, eMountain Biking, Indoor Biking
WellnessWalking, Pilates, Yoga, Indoor Walking
MultisportTriathlon
In the ringBoxing, Mixed Martial Arts
Team sports
Basketball, Volleyball, Field Hockey, Ice Hockey, Football/Soccer, American Football, Lacrosse, Rugby, Ultimate Disc, Cricket, Softball, Baseball
On the WaterStand Up Paddleboarding, Rowing
Racket sports
Tennis, Pickleball, Badminton, Squash, Table Tennis, Padel, Platform Tennis, Racquetball
Snow & winterSkiing, Snowboarding, XC Classic Skiing
Indoor running
Treadmill Running, Indoor Track Running, Virtual Running
Outdoor running
Running, Outdoor Track Running, Trail Running, Ultra Running
Outdoor recreationHiking, Bouldering, Archery
Other activity profilesInline skating
Swimming Features14
Pool swim workoutsYes
Critical swim speedYes
Time and distance alertsYes
Auto rest (pool swim only)Yes
Drill logging (pool swim only)Yes
Pacing alerts (pool swim only)Yes
Countdown start (pool swim only)Yes
Underwater wrist-based heart rateYes
"Repeat on" rest timer (pool swim only)Yes
Basic rest timer (up from 0) (pool swim only)Yes
Stroke type detection (freestyle, backstroke, breaststroke, butterfly) (pool swim only)Yes
Pool swim metrics (lengths, distance, pace, stroke count, swim efficiency (SWOLF), calories)Yes
Open-water swim metrics (distance, pace, stroke count/rate, stroke distance, swim efficiency (SWOLF), calories)Yes
Heart rate from external HRM (real-time during rests, interval and session stats during rests, and automatic heart rate download post-swim)yes (with HRM-Swim, HRM-Pro or HRM-Pro Plus)
Outdoor Recreation15
Up AheadYes
Auto restYes
TracBack®Yes
Back to startYes
UltraTrac modeYes
Vertical speedYes
Elevation profileYes
Projected waypointYes
Total ascent/descentYes
Future elevation plotYes
Distance to destinationYes
Sun and moon informationYes
Point-to-point navigationYes
Bread crumb trail in real timeYes
Barometric trend indicator with Storm AlertYes
Daily Smart Features21
Stocksyes (optional Connect IQ app)
CalendarYes
ConnectivityBluetooth®, ANT+®
Find My PhoneYes
Find My WatchYes
VIRB® RemoteYes
Morning reportYes
Weather forecastsYes
Smart NotificationsYes
Smart trainer controlYes
Smartphone compatibilityiPhone® and Android™
Controls smartphone musicYes
On-device Connect IQ™ StoreYes
Find My Phone during GPS activityYes
Pairs with Garmin Connect™ MobileYes
Compatible with Garmin Messenger appYes
Battery saver (customizable low power watch)Yes
Realtime settings sync with Garmin Connect™ mobileYes
View images from notifications on watch (Android™ only)Yes
Text response/reject phone call with text (Android™ only)Yes
Connect IQ™ (downloadable watch faces, data fields, widgets and apps)Yes
Gym & Fitness Equipment7
HIIT workoutsYes
Yoga workoutsYes
Pilates workoutsYes
Strength workoutsYes
Automatic rep countingYes
On-screen workout animationsYes
On-screen workout muscle mapsYes
Activity Tracking Features9
TrueUp™Yes
Move IQ™Yes
Step counterYes
Floors climbedYes
Calories burnedYes
Distance traveledYes
Intensity minutesYes
Garmin Connect™ Challenges appyes (optional Connect IQ app)
Auto goal (learns your activity level and assigns a daily step goal)Yes
Health & Wellness Monitoring15
Sleepyes (advanced)
Hydration
yes (in Garmin Connect™ and optional Connect IQ™ widget)
Fitness ageYes
Sleep coachYes
Nap detectionYes
All-day stressYes
Women's health
yes (in Garmin Connect™ and optional Connect IQ™ widget)
Health snapshotYes
Relaxation remindersYes
Respiration rate (24x7)Yes
Daily resting heart rateYes
Abnormal heart rate alertsyes (high and low)
Relaxation breathing timerYes
Body Battery™ energy monitorYes
Wrist-based heart rate (constant, every second)Yes
Safety and Tracking Features5
LiveTrackYes
AssistanceYes
Live Event SharingAndroid™ Only
Incident Detection during select activitiesYes
Incident detection alert on phone for wearablesYes
Kid Activity Tracking Features1
Toe-to-Toe™ Challenges app
yes (optional Connect IQ Toe-to-Toe™ Challenges app)
Training, Planning and Analysis Features46
% HRRYes
% HR maxYes
HR zonesYes
HR alertsYes
Auto Lap®Yes
HRV statusYes
Load ratioYes
Manual lapYes
Rest timerYes
Auto max HRYes
Auto scrollYes
Finish timeYes
HR caloriesYes
Auto Pause®Yes
Audio promptsYes
Custom alertsYes
Physio TrueUpYes
Recovery timeYes
Training loadYes
VO2 Max (Run)Yes
Course guidanceYes
Training effectYes
Virtual PartnerYes
Race an ActivityYes
Advanced workoutsYes
Interval trainingYes
Race glance/widgetYes
Training load focusYes
VO2 Max (Trail Run)Yes
GPS speed and distanceYes
Configurable lap alertsYes
Customizable data pagesYes
Unified training statusYes
Touch and/or button lockYes
Activity history on watchYes
Auto multisport activitiesYes
Multisport auto transitionYes
Downloadable training plansYes
Training effect (anaerobic)Yes
Manual multisport activitiesYes
HRM running pace and distanceYes
Customizable activity profilesYes
Respiration rate (during exercise)yes (with compatible accessory)
Primary benefit (Training Effect labels)Yes
HR broadcast (broadcasts HR data over ANT+® to paired devices)Yes
Improved interval (includes open repeats, intervals data page, rest screen and auto detection)Yes
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Forerunner® 255S — Frequently Asked Questions
What size is the Garmin Forerunner® 255S?
The Garmin Forerunner® 255S has a 41mm case and is 12.4mm thick.
Will the Garmin Forerunner® 255S fit my wrist?
The Garmin Forerunner® 255S looks balanced on flat wrist widths of roughly 43–59mm (about 11.5–15.8cm circumference). Use the interactive fit tool above to check against your own wrist.
How much does the Garmin Forerunner® 255S weigh?
The Garmin Forerunner® 255S weighs 39g (case only; straps add weight).
What is the best way to compare the Garmin Forerunner® 255S with other watches?
Use our side-by-side comparison tool to see the Garmin Forerunner® 255S next to any other watch — case size, thickness, lug-to-lug and full specs, scaled to real proportions.