Garmin · 2019
Forerunner 945Size, Dimensions & Wrist Fit
The Garmin Forerunner 945 sits best on flat wrist widths of about 49–67mm (≈ 13.1–17.9cm wrist circumference). Adjust the slider below to check your wrist.
Affiliate disclosure: As an Amazon Associate, WatchFitTool earns from qualifying purchases. If you buy through links on this page, we may earn a commission at no extra cost to you. Learn more.
The Forerunner® 945 in short
The figures that decide whether this watch suits you, pulled out of the full specification sheet further down.
- Rated for 36 hours of use per charge.
- Water rated to 5 ATM.
- 50g on the wrist. Lighter than 71% of the 47mm watches we have weights for.
- 1.2" (30.4 mm) diameter Sunlight-visible, transflective memory-in-pixel (MIP) display.
- Takes 22mm bands, so third-party straps fit without an adapter.
Does the Forerunner 945 fit your wrist?
Drag the slider to your wrist width and see the Forerunner 945 overlaid at true scale. Lug-to-lug — not case diameter — decides whether a watch overhangs your wrist.
Watch Fit Tool
For sports watches, lug-to-lug (L2L) is what matters most — it decides whether a watch overhangs your wrist. Bulky is fine; overhang is not.
Measure at the point where you wear your watch — typically just below the wrist bone.
Flat width — lay your arm on a table, palm facing up, and measure straight across the top of your wrist with a ruler. Bone to bone; do not follow the curve down the sides.
Around — wrap a tape measure snugly round the wrist. No tape? Wrap a strip of paper, mark the overlap and hold the strip against a ruler.
Width ≠ circumference. They are different numbers — around 170mm is about 64mm across — so set the toggle to whichever one you actually measured before you type it in.
Garmin Forerunner® 945
Case 47.0mm · Lug-to-lug 47.0mm · Thickness 13.7mm · 50g
Sweet Spot
47mm on a 55mm wrist
Across the wrist it works — 4.0mm spare each side — but a tall watch on this wrist. Fine over a sleeve, awkward under one.
On a 55mm wrist the sweet spot is 47–53mm lug to lug. This one is 47mm.
Measure where you wear it, just below the wrist bone. Either of these works — the tool converts between them.
- 1. Flat width — arm flat on a table, palm up. Measure straight across the top of the wrist, bone to bone, ignoring the curve down the sides.
- 2. Around — a tape, or a strip of paper marked and held against a ruler, snug the whole way round.
Leather: Attaches at the lugs, so the case back rests on your skin. Thins and softens with wear. Typical figures, not this model’s own.
Show the measurementsHide the measurements
- Across the wrist4.0mm spare each side
Fills the wrist without reaching the edge.
- Off the wrist13.7mm off the skin
A tall watch on this wrist. Fine over a sleeve, awkward under one. (13.7mm case, back against the skin)
- How it seats~6.1mm under the rim
Wide enough that the edge of the case back lifts clear of the skin.
- Weight on the wrist50g
Light enough to forget you have it on. (0.9g per mm of wrist)
Happy with the fit? Check current availability for the Forerunner 945.
Check offer2D Dimension Schematics
The Forerunner® 945 drawn to scale — from above, and in profile against the wrist.
- Garmin Forerunner® 94547mm · 13.7mm thick
3D preview
Garmin Forerunner® 945 on a wrist
On an arm sized to your own wrist — the view a product photo never gives you.
Shapes are built from published measurements, not manufacturer 3D models — accurate proportions, generic dial.
Which Forerunner 945 size fits you?
This model comes in 2 versions. Set your measurement and each one reports its own verdict — tap any size to open its page.
Which of these fits your wrist?
Roughly a 14.7cm wrist circumference — the measurement a tape gives you. Compared against lug-to-lug where we have it, case width otherwise.
All 2 Forerunner 945 variants fit this wrist. The 47mm gives you the most presence without overhanging; the smallest is the discreet end of the range.
- Width
- 44.4mm
- Thick
- 13.9mm
- Weight
- 49g
5.3mm clear a side
View this size- Width
- 47mm
- Thick
- 13.7mm
- Weight
- 50g
4.0mm clear a side
Forerunner® 945 battery life
The runtime the manufacturer publishes for everyday use.
- Smartwatch36 hours
How the Forerunner® 945 ranks on battery
Against the 296 Garmin watches in our database, ranked on each figure Garmin publishes.
- Everyday use14 days#151 of 285
- GPS tracking36 hours#128 of 267
What size band does the Forerunner® 945 take?
Lug width
22mm
Any 22mm strap fits, so you are not restricted to Garmin's own bands. Quick-release pins let you swap without tools — check that a replacement lists 22mm and quick-release before buying.
Affiliate disclosure: As an Amazon Associate, WatchFitTool earns from qualifying purchases. If you buy through links on this page, we may earn a commission at no extra cost to you. Learn more.
Forerunner® 945 specifications
The figures that decide a purchase, followed by every line Garmin publishes.
- Battery life
- Smartwatch Mode: Up to 2 weeksGPS mode with music: Up to 10 hoursGPS mode without music: Up to 36 hours
- Display
- 1.2" (30.4 mm) diameter
- Resolution
- 240 x 240 pixels
- Water rating
- 5 ATM
- Bezel
- fiber-reinforced polymer
- Glass
- Corning® Gorilla® Glass 3 DX
- Strap
- silicone
- Storage
- 16 GB
- Charging
- Garmin proprietary plug charger
Full specification sheet
219 published lines across 20 groups, unedited
Overview
- Family
- Garmin
General
- Battery life
- Smartwatch Mode: Up to 2 weeksGPS mode with music: Up to 10 hoursGPS mode without music: Up to 36 hours
- Display Size
- 1.2" (30.4 mm) diameter
- Color display
- Lens Material
- Corning® Gorilla® Glass 3 DX
- Bezel Material
- fiber-reinforced polymer
- Memory/History
- 16 GB
- Strap material
- silicone
- Charging method
- Garmin proprietary plug charger
- Display resolution
- 240 x 240 pixels
- QuickFit® watch band compatible
- yes (22 mm compatible)
Sensors
- GPS
- Compass
- GLONASS
- Galileo
- Gyroscope
- Thermometer
- Accelerometer
- Barometric altimeter
- Pulse Ox Blood Oxygen Saturation Monitor
- Garmin Elevate™ wrist heart rate monitor
Product Info
- Main SKU
- 010-02063-10
- Product ID
- 621922
- Product Name
- Forerunner® 945
- Release Date
- 4/30/2019
- Product Variation
- Blue Bundle
Clock Features
- Timer
- Stopwatch
- Time/date
- Alarm clock
- GPS Time Sync
- Sunrise/sunset times
- Automatic daylight saving time
Cycling Features
- Courses
- MTB Grit & Flow
- Race an activity
- Power meter compatible
- Advanced cycling dynamics
- Compatible with Varia™ lights
- FTP (Functional Threshold Power)
- yes (with compatible accessory)
- Speed and cadence sensor support (w/sensor)
- Cycle Map (routable cycling-specific street map)
- Bike lap and lap maximum power (with power sensor)
- Compatible with Varia™ radar (rear-facing radar)
- Compatible with Vector™ and Rally™ (power meters)
- Compatible with Varia Vision™ (head-mounted display)
- Alerts (triggers alarm when you reach goals including time, distance, heart rate or calories)
Golfing Features
- Digital scorecard
- Garmin AutoShot™
- Round timer/odometer
- TruSwing™ compatible
- Auto CourseView updates
- Yardage to layups/doglegs
- Hazards and course targets
- Pairs with Garmin Golf app
- Green View with manual pin position
- Preloaded with 43,000 courses worldwide
- Yardage to F/M/B (distance to front, middle and back of green)
- Stat tracking (strokes, putts per round, greens and fairways hit)
- Measures shot distance (calculates exact yardage for shots from anywhere on course)
- automatic
Running Features
- Run workouts
- Race predictor
- Foot pod capable
- Running dynamics
- yes (with compatible accessory)
- Lactate threshold
- yes (with compatible accessory)
- Trail run auto climb
- Performance condition
- Run/Walk/Stand detection
- Stride length (real time)
- yes (with compatible accessory)
- PacePro™ Pacing Strategies
- Vertical oscillation and ratio
- yes (with compatible accessory)
- Ground contact time and balance
- yes (with compatible accessory)
- GPS-based distance, time and pace
- Cadence (provides real-time number of steps per minute)
What You'll Love
- Display type
- Sunlight-visible, transflective memory-in-pixel (MIP)
- Water rating
- 5 ATM
- Garmin Pay™
- Music storage
- Training status
- Built-in mapping
- Pulse Ox blood oxygen
- yes (spot-check, and optional all-day acclimation and in sleep)
- Sleep score and insights
- Battery life (smartwatch mode)
- Up to 2 weeks
Activity Profiles
- Gym
- Strength, HIIT, Cardio, Elliptical Training, Stair Stepping, Floor Climbing, Indoor Rowing
- Swim
- Pool Swimming, Open Water Swimming
- Cycling
- Biking, Mountain Biking, Indoor Biking
- Wellness
- Walking, Pilates, Yoga
- Multisport
- Swimming/Running
- On the Water
- Stand Up Paddleboarding, Rowing, Kayaking
- Snow & winter
- Skiing, Snowboarding, XC Classic Skiing
- Indoor running
- Treadmill Running, Indoor Track Running, Virtual Running
- Outdoor running
- Running, Outdoor Track Running, Trail Running
- Outdoor recreation
- Hiking, Climbing, Golfing
Swimming Features
- Pool swim workouts
- Critical swim speed
- Time and distance alerts
- Auto rest (pool swim only)
- Drill logging (pool swim only)
- Pacing alerts (pool swim only)
- Countdown start (pool swim only)
- Underwater wrist-based heart rate
- "Repeat on" rest timer (pool swim only)
- Basic rest timer (up from 0) (pool swim only)
- Stroke type detection (freestyle, backstroke, breaststroke, butterfly) (pool swim only)
- Pool swim metrics (lengths, distance, pace, stroke count, swim efficiency (SWOLF), calories)
- Open-water swim metrics (distance, pace, stroke count/rate, stroke distance, swim efficiency (SWOLF), calories)
- 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-Tri, HRM-Swim, HRM-Pro or HRM-Pro Plus)
Tactical Features
- XERO™ Locations
- Dual grid coordinates
Outdoor Recreation
- TracBack®
- Back to start
- Fish forecast
- yes (via Connect IQ™)
- Explore Nearby
- UltraTrac mode
- Vertical speed
- GPS coordinates
- Area calculation
- yes (via Connect IQ™)
- Elevation profile
- Projected waypoint
- Total ascent/descent
- Future elevation plot
- Distance to destination
- Sun and moon information
- yes (via Connect IQ™)
- Point-to-point navigation
- ClimbPro™ Ascent Planner
- Preloaded road and trail maps
- Bread crumb trail in real time
- Downloadable cartography support
- Barometric trend indicator with Storm Alert
Daily Smart Features
- Calendar
- Connectivity
- Bluetooth®, ANT+®, Wi-Fi®
- Find My Phone
- Find My Watch
- VIRB® Remote
- Weather forecasts
- Smart Notifications
- Smartphone compatibility
- iPhone®, Android™
- Controls smartphone music
- Plays and controls watch music
- Pairs with Garmin Connect™ Mobile
- Text response/reject phone call with text (Android™ only)
- Connect IQ™ (downloadable watch faces, data fields and apps)
Activity Tracking Features
- TrueUp™
- Move IQ™
- Step counter
- Floors climbed
- Calories burned
- Distance traveled
- Intensity minutes
- Automatic rep counting
- Garmin Connect™ Challenges app
- yes (optional Connect IQ app)
- Move alerts (displays on device after a period of inactivity)
- Auto goal (learns your activity level and assigns a daily step goal)
Workout and Training Plans
- Yoga workouts
- Cardio workouts
- Pilates workouts
- Strength workouts
- On-screen workout animations
Health & Wellness Monitoring
- Sleep
- yes (advanced)
- Hydration
- yes (in Garmin Connect™ and optional Connect IQ™ widget)
- Fitness age
- yes (in app)
- All-day stress
- Women's health
- yes (in Garmin Connect™ and optional Connect IQ™ widget)
- Respiration rate
- Resting heart rate
- Abnormal heart rate alerts
- yes (high and low)
- Relaxation breathing timer
- Body Battery™ energy monitor
- Wrist-based heart rate (constant, every second)
Safety and Tracking Features
- Assistance
- Live Event Sharing
- Android™ Only
- Incident Detection during select activities
- Incident detection alert on phone for wearables
Kid Activity Tracking Features
- Toe-to-Toe™ Challenges app
- yes (optional Connect IQ Toe-to-Toe™ Challenges app)
Training, Planning and Analysis Features
- % HRR
- % HR max
- HR zones
- HR alerts
- Shortcuts
- Manual lap
- Auto max HR
- Auto scroll
- Finish time
- HR calories
- Voice alerts
- Custom alerts
- Physio TrueUp
- Recovery time
- Training load
- VO2 Max (Run)
- Course guidance
- Training effect
- Virtual Partner
- Race an Activity
- Advanced workouts
- Interval training
- Training load focus
- Garmin Live Segments
- Strava Live Segments
- GPS speed and distance
- Improved recovery time
- Configurable lap alerts
- Customizable data pages
- Touch and/or button lock
- Activity history on watch
- Downloadable training plans
- Training effect (anaerobic)
- Manual multisport activities
- HRM running pace and distance
- Heat and altitude acclimation
- Customizable activity profiles
- Trendline™ Popularity Routing
- Auto Pause® automatic timer halt
- Respiration rate (during exercise)
- yes (with compatible accessory)
- Auto Lap® interval tracking feature
- Primary benefit (Training Effect labels)
- Round-trip course creator (running/cycling)
- HR broadcast (broadcasts HR data over ANT+® to paired devices)
- yes (using ANT+ or BLE)
- HRV stress test (measures your heart rate variability while standing still, for 3 minutes, to provide you with an estimated stress level; the scale of this is 1 to 100; low scores indicate lower stress levels)
- yes (with compatible accessory)
Alternatives to the Forerunner® 945
Watches that cover a similar amount of wrist, with the measurements that separate them.
Garmin
Fenix 9 47mm
- Width
- 47mm
- Thick
- 13.8mm
- Weight
- 75g
Garmin
Fenix 9 Pro 47mm
- Width
- 47mm
- Thick
- 13.8mm
- Weight
- 78g
Garmin
Fenix 9 Pro inReach Solar 47mm
- Width
- 47mm
- Thick
- 15.8mm
- Weight
- 84g
Garmin
Fenix 9 Pro Solar 47mm
- Width
- 47mm
- Thick
- 15.8mm
- Weight
- 84g
Garmin
Fenix 9 Pro inReach 47mm
- Width
- 47mm
- Thick
- 13.8mm
- Weight
- 78g
Garmin
quatix 8 Pro 47mm AMOLED
- Width
- 47mm
- Thick
- 16mm
- Weight
- 77g
Forerunner® 945 — Frequently Asked Questions
Will the Garmin Forerunner 945 fit my wrist?
The Garmin Forerunner 945 looks balanced on flat wrist widths of roughly 49–67mm (about 13.1–17.9cm circumference). Drag the slider above to check it against your own measurement.
What size band does the Garmin Forerunner 945 take?
22mm. Any 22mm strap fits, so you are not limited to Garmin's own bands — look for a quick-release fitting if you want to swap without tools.
How long does the Garmin Forerunner 945 battery last?
Garmin rates it at 36 hours per charge in everyday use.
How does the Garmin Forerunner 945 battery compare with other Garmin watches?
At 14 days in everyday use it ranks #151 of the 285 Garmin watches in our database — below the middle of the range. The full ranking, including GPS and power-saving figures, is on our Garmin battery life comparison.
Is the Garmin Forerunner 945 thick for a 47mm watch?
At 13.7mm, middle of the pack for thickness at this width. Thickness, not case width, is what decides whether a watch catches on a shirt cuff.
Should I get the 44.4mm or 47mm Forerunner 945?
The Forerunner 945 comes in 2 case sizes — 44.4mm, 47mm. Which one suits you depends on the flat width of your wrist rather than preference: the larger sizes need a wider wrist to sit inside the edge. Set your measurement in the size picker above and each variant reports its clearance in millimetres.
What other watches are the same size as the Garmin Forerunner 945?
Oppo Watch X3, Xiaomi Watch 5, CMF Watch 3 Pro, Amazfit Balance 2 all sit within half a millimetre of the Garmin Forerunner 945's 47mm case, so they cover the same amount of wrist.
