Garmin · 2015
Forerunner 25Size, Dimensions & Wrist Fit
Case Width
35mm
Thickness
13.9mm
Lug-to-Lug
44mm
Weight
31g
The Garmin Forerunner 25 sits best on flat wrist widths of about 46–63mm (≈ 12.3–16.8cm wrist circumference). Adjust the slider below to check your wrist.
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The Forerunner® 25 in short
The figures that decide whether this watch suits you, pulled out of the full specification sheet further down.
- Rated for 8 weeks of use per charge.
- 31g on the wrist. Lighter than 83% of the 35mm watches we have weights for.
- Small: 0.73” x 0.73” (18.5 x 18.5 mm) Large: 0.91” x 0.91” (23.0 x 23.0 mm) display.
- acrylic case, acrylic glass.
Does the Forerunner 25 fit your wrist?
Drag the slider to your wrist width and see the Forerunner 25 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® 25
Case 44.0mm · Lug-to-lug 44.0mm · Thickness 13.9mm · 31g
Balanced Fit
44mm on a 55mm wrist
Across the wrist it works — 5.5mm 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 44mm, so you could go bigger.
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 wrist5.5mm spare each side
Comfortable, with visible skin either side.
- Off the wrist13.9mm off the skin
A tall watch on this wrist. Fine over a sleeve, awkward under one. (13.9mm case, back against the skin)
- How it seats~4.7mm under the rim
Seats well, with the case back following most of the wrist.
- Weight on the wrist31g
Light enough to forget you have it on. (0.6g per mm of wrist)
Happy with the fit? Check current availability for the Forerunner 25.
Check offer2D Dimension Schematics
The Forerunner® 25 drawn to scale — from above, and in profile against the wrist.
- Garmin Forerunner® 2535mm × 44mm · 13.9mm thick
3D preview
Garmin Forerunner® 25 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.
Forerunner® 25 battery life
The runtime the manufacturer publishes for everyday use.
- Smartwatch8 weeks
How the Forerunner® 25 ranks on battery
Against the 296 Garmin watches in our database, ranked on each figure Garmin publishes.
- Everyday use70 days#28 of 285
- GPS tracking10 hours#243 of 267
Forerunner® 25 specifications
The figures that decide a purchase, followed by every line Garmin publishes.
- Battery life
- Small: Watch: Up to 8 weeks; GPS mode: Up to 8 hoursLarge: Watch: Up to 10 weeks; GPS mode: Up to 10 hours
- Display
- Small: 0.73” x 0.73” (18.5 x 18.5 mm) Large: 0.91” x 0.91” (23.0 x 23.0 mm)
- Resolution
- 128 x 128 pixels
- Glass
- acrylic
- Strap
- silicone
- Storage
- 7 activities
Full specification sheet
39 published lines across 10 groups, unedited
Overview
- Family
- Garmin
General
- Battery life
- Small: Watch: Up to 8 weeks; GPS mode: Up to 8 hoursLarge: Watch: Up to 10 weeks; GPS mode: Up to 10 hours
- Display Size
- Small: 0.73” x 0.73” (18.5 x 18.5 mm) Large: 0.91” x 0.91” (23.0 x 23.0 mm)
- Lens Material
- acrylic
- Memory/History
- 7 activities
- Strap material
- silicone
- Display resolution
- 128 x 128 pixels
Sensors
- GPS
Product Info
- Main SKU
- 010-01353-01
- Product ID
- 164366
- Product Name
- Forerunner® 25
- Release Date
- 8/5/2015
- Product Variation
- Black/Blue Watch Only
Clock Features
- Stopwatch
- Time/date
- Alarm clock
- GPS Time Sync
- Automatic daylight saving time
Running Features
- Foot pod capable
- GPS-based distance, time and pace
- Cadence (provides real-time number of steps per minute)
Activity Profiles
- Outdoor recreation
Daily Smart Features
- Connectivity
- Smartphone compatibility
- iPhone®, Android™
- Pairs with Garmin Connect™ Mobile
Activity Tracking Features
- Step counter
- Calories burned
- Distance traveled
- Move alerts (displays on device after a period of inactivity)
- Auto goal (learns your activity level and assigns a daily step goal)
Training, Planning and Analysis Features
- HR zones
- yes (with compatible accessory)
- HR alerts
- yes (with compatible accessory)
- Manual lap
- HR calories
- yes (with compatible accessory)
- GPS speed and distance
- Customizable data pages
- Activity history on watch
- Auto Pause® automatic timer halt
- Auto Lap® interval tracking feature
Alternatives to the Forerunner® 25
Watches that cover a similar amount of wrist, with the measurements that separate them.
Garmin
Lily® 2 Classic
- Width
- 35.4mm
- Thick
- 10.1mm
- Weight
- 20.6g
Garmin
Lily® 2
- Width
- 35.4mm
- Thick
- 10.1mm
- Weight
- 24.4g
Garmin
Lily® - Sport Edition
- Width
- 34.5mm
- Thick
- 10.15mm
- Weight
- 24g
Garmin
Lily® - Classic Edition
- Width
- 34.5mm
- Thick
- 10.15mm
- Weight
- 24g
Garmin
Approach® S10
- Width
- 35.5mm
- Thick
- 11.3mm
- Weight
- 35g
Garmin
Forerunner® 30
- Width
- 35.5mm
- Thick
- 13.3mm
- Weight
- 37.3g
Forerunner® 25 — Frequently Asked Questions
Will the Garmin Forerunner 25 fit my wrist?
The Garmin Forerunner 25 looks balanced on flat wrist widths of roughly 46–63mm (about 12.3–16.8cm circumference). Drag the slider above to check it against your own measurement.
How long does the Garmin Forerunner 25 battery last?
Garmin rates it at 8 weeks per charge in everyday use.
How does the Garmin Forerunner 25 battery compare with other Garmin watches?
At 70 days in everyday use it ranks #28 of the 285 Garmin watches in our database — the top 10% of the range. The full ranking, including GPS and power-saving figures, is on our Garmin battery life comparison.
Is the Garmin Forerunner 25 thick for a 35mm watch?
At 13.9mm, thicker than 99% of 35mm watches — it will sit noticeably high on the wrist. Thickness, not case width, is what decides whether a watch catches on a shirt cuff.
What other watches are the same size as the Garmin Forerunner 25?
Apple Watch Series 11 - GPS + Cellular · Titanium · 42mm, Certina DS Action Quartz 34.5 Stainless Steel - Yellow Gold / MOP / Bracelet, Tissot PRX Quartz 35 Stainless Steel / Red, TAG Heuer Formula 1 Kith 35 PVD - Blue / Black all sit within half a millimetre of the Garmin Forerunner 25's 35mm case, so they cover the same amount of wrist.
What is the lug-to-lug of the Garmin Forerunner 25?
44mm, against a 35mm case width. Lug-to-lug is the measurement that decides overhang: if it exceeds the flat width of your wrist, the lugs sit past the edge no matter how modest the case diameter looks.
