BlazeSize, Dimensions & Wrist Fit
The Fitbit Blaze sits best on flat wrist widths of about 44–60mm (≈ 11.7–16.0cm wrist circumference). Adjust the slider below to check your wrist.
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The Blaze in short
The figures that decide whether this watch suits you, pulled out of the full specification sheet further down.
- Rated for 5 days of use per charge.
- Water rated to Sweat resistant.
- 1.6 inches LCD display.
Does the Blaze fit your wrist?
Drag the slider to your wrist width and see the Blaze 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.
Fitbit Blaze
Case 42.0mm · Lug-to-lug ~48.3mm
Balanced Fit
48.3mm on a 55mm wrist
Comfortably inside the edges of your wrist, and it seats and sits low enough to wear without thinking about it.
On a 55mm wrist the sweet spot is 47–53mm lug to lug. This one is 48.3mm.
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.
- No published lug-to-lug for this watch — the span is estimated at 1.15× the case, which is the usual ratio but not a measurement.
- No published thickness, so there is nothing to say about how far it stands off the wrist.
Show the measurementsHide the measurements
- Across the wrist3.4mm spare each side
Fills the wrist without reaching the edge.
- How it seats~4.0mm under the rim
Seats well, with the case back following most of the wrist.
Happy with the fit? Check current availability for the Blaze.
Check offer2D Dimension Schematics
The Blaze drawn to scale — from above, and in profile against the wrist.
- Fitbit Blaze42mm
Blaze battery life
The runtime the manufacturer publishes for everyday use.
- Smartwatch5 days
How the Blaze ranks on battery
Against the 10 Fitbit watches in our database, ranked on each figure Fitbit publishes.
- Everyday use5 days#6 of 10
Blaze specifications
The figures that decide a purchase, followed by every line Fitbit publishes.
- Battery life
- 5 days
- Display
- 1.6 inches
- Resolution
- 272 x 340 px
- Water rating
- Sweat resistant
- Charging
- 2 hours
Full specification sheet
30 published lines across 8 groups, unedited
Design
- width
- 42
- resolution
- 272 x 340 px
- screen size
- 1.6 inches
- Display type
- LCD
- Has a display
- water resistance
- Sweat resistant
- has a touch screen
- Watch band is replaceable
Battery
- charge time
- 2 hours
- battery life
- 5 days
- has a rechargeable battery
Sensors
- has an accelerometer
- Has a heart rate monitor
Features
- Has a stopwatch
- Has call control
- Has silent alarm
- Has notifications
- Locates your phone
Connectivity
- has NFC
- Bluetooth version
- 4
- Is compatible with iOS
- Is compatible with Android
Miscellaneous
- has a battery level indicator
App & Software
- Provides activity reports
- Counts how many calories you've burned
Activity tracking
- Tracks distance
- Tracks elevation
- Tracks your sleep
- Tracks steps taken
- Provides sleep reports
Alternatives to the Blaze
Watches that cover a similar amount of wrist, with the measurements that separate them.
Fitbit
Ace LTE
- Width
- 41.04mm
- Thick
- 13.35mm
- Weight
- 28.03g
Fitbit
Sense 2
- Width
- 40.5mm
- Thick
- 12.35mm
- Weight
- 46g
Fitbit
Versa 4
- Width
- 40.4mm
- Thick
- 12.3mm
- Weight
- 40g
Fitbit
Versa 3
- Width
- 40.4mm
- Thick
- 12.4mm
- Weight
- 39g
Fitbit
Sense
- Width
- 40.4mm
- Thick
- 12.4mm
- Weight
- 48.2g
Fitbit
Versa 2
- Width
- 40mm
- Thick
- 12mm
- Weight
- 38g
Blaze — Frequently Asked Questions
Will the Fitbit Blaze fit my wrist?
The Fitbit Blaze looks balanced on flat wrist widths of roughly 44–60mm (about 11.7–16.0cm circumference). Drag the slider above to check it against your own measurement.
How long does the Fitbit Blaze battery last?
Fitbit rates it at 5 days per charge in everyday use.
How does the Fitbit Blaze battery compare with other Fitbit watches?
At 5 days in everyday use it ranks #6 of the 10 Fitbit watches in our database — below the middle of the range. The full ranking, including GPS and power-saving figures, is on our Fitbit battery life comparison.
What other watches are the same size as the Fitbit Blaze?
Certina DS Action Chrono PVD / Carbon / Bracelet, Omega Speedmaster Professional Moonwatch 3861 Moonshine Gold / Black Lacquer, TAG Heuer Carrera Chronograph Seafarer Stainless Steel / Silver, Huawei Watch 5 - 42mm all sit within half a millimetre of the Fitbit Blaze's 42mm case, so they cover the same amount of wrist.
