Amazfit · 2020
Bip USize, Dimensions & Wrist Fit
Case Width
35.5mm
Thickness
11.4mm
Lug-to-Lug
40.9mm
Weight
31g
The Amazfit Bip U sits best on flat wrist widths of about 43–58mm (≈ 11.5–15.5cm wrist circumference). Adjust the slider below to check your wrist.
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The Bip U in short
The figures that decide whether this watch suits you, pulled out of the full specification sheet further down.
- Rated for 9 days of use per charge.
- Water rated to 50 m.
- 31g on the wrist. Lighter than 82% of the 36mm watches we have weights for.
- 1.43 inches LCD display.
- Takes 20mm bands, so third-party straps fit without an adapter.
Does the Bip U fit your wrist?
Drag the slider to your wrist width and see the Bip U 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.
Amazfit Bip U
Case 40.9mm · Lug-to-lug 40.9mm · Thickness 11.4mm · 31g
Balanced Fit
40.9mm 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 40.9mm, 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 wrist7.1mm spare each side
Comfortable, with visible skin either side.
- Off the wrist11.4mm off the skin
Normal sports-watch height for a wrist this size. (11.4mm case, back against the skin)
- How it seats~3.7mm 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 Bip U.
Check offer2D Dimension Schematics
The Bip U drawn to scale — from above, and in profile against the wrist.
- Amazfit Bip U35.5mm × 40.9mm · 11.4mm thick
3D preview
Amazfit Bip U 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.
Bip U battery life
The runtime the manufacturer publishes for everyday use.
- Smartwatch9 days
How the Bip U ranks on battery
Against the 54 Amazfit watches in our database, ranked on each figure Amazfit publishes.
- Everyday use9 days#40 of 54
- Capacity225 mAh#41 of 52
What size band does the Bip U take?
Lug width
20mm
Any 20mm strap fits, so you are not restricted to Amazfit's own bands. Quick-release pins let you swap without tools — check that a replacement lists 20mm 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.
Bip U specifications
The figures that decide a purchase, followed by every line Amazfit publishes.
- Battery life
- 9 days
- Display
- 1.43 inches
- Resolution
- 302 x 320 px
- Water rating
- 5 ATM
- Strap
- 20 mm
- Charging
- 2 hours
Full specification sheet
112 published lines across 8 groups, unedited
Design
- width
- 35.5
- height
- 40.9
- volume
- 16.55 cm³
- weight
- 31 g
- thickness
- 11.4
- ATM rating
- 5 ATM
- resolution
- 302 x 320 px
- screen size
- 1.43 inches
- Display type
- LCD
- Has a display
- pixel density
- 308 ppi
- width of band
- 20 mm
- water resistance
- Waterproof
- Always-On Display
- has a touch screen
- waterproof depth rating
- 50 m
- Watch band is replaceable
- Has sapphire glass display
- has branded damage-resistant glass
Battery
- charge time
- 2 hours
- battery life
- 9 days
- battery power
- 225 mAh
- has wireless charging
- has a removable battery
- Has a solar power battery
- has a rechargeable battery
Sensors
- has GPS
- has a compass
- Has a barometer
- has a gyroscope
- Has a cadence sensor
- has an accelerometer
- Monitors perspiration
- Has a heart rate monitor
- Has a temperature sensor
- Monitors blood oxygenation levels
Features
- release date
- 2020-10-16
- Has a stopwatch
- Has smart alarm
- warranty period
- 1 years
- Has call control
- Has silent alarm
- has HRV tracking
- measures VO2 max
- Has notifications
- Has ECG technology
- Locates your phone
- has a front camera
- has fall detection
- has voice commands
- Acquires GPS faster
- Has vibrating alerts
- number of microphones
- 0
- shows readiness level
- Can be used to answer calls
- measures resting heart rate
- has irregular heart rate warnings
- has fast/slow heart rate notifications
- Has a built-in camera remote control function
Connectivity
- has NFC
- supports ANT+
- supports Wi-Fi
- supports Galileo
- Bluetooth version
- 5
- has a cellular module
- Is compatible with iOS
- Is compatible with Android
Miscellaneous
- has aptX
- Has passcode
- Has auto pause
- Is compatible with Windows
- Is compatible with Mac OS X
- has an external memory slot
- Compatible with smart scales
- has a battery level indicator
- has a socket for a 3.5 mm audio jack
- Compatible with external heart rate monitors
App & Software
- Ad-free
- Free app
- Tracks BMI
- Has coaching
- Includes maps
- Supports routes
- Has achievements
- Has goal setting
- Has live tracking
- Has exercise diary
- Predicts ovulation
- Can be personalised
- Has weight tracking
- Predicts start date
- Tracks water intake
- Has inactivity alerts
- Has period notifications
- Has temperature tracking
- Provides activity reports
- Displays fertile window notifications
- Counts how many calories you've burned
Activity tracking
- Measures pace
- Tracks distance
- Tracks elevation
- Designed for golf
- Tracks your sleep
- Tracks steps taken
- Designed for diving
- Has a route tracker
- Has exercise tagging
- Has multi-sport mode
- Tracks calorie intake
- Provides sleep reports
- Detects activities automatically
- Has a stroke counter for swimming
Alternatives to the Bip U
Watches that cover a similar amount of wrist, with the measurements that separate them.
Bip U — Frequently Asked Questions
Will the Amazfit Bip U fit my wrist?
The Amazfit Bip U looks balanced on flat wrist widths of roughly 43–58mm (about 11.5–15.5cm circumference). Drag the slider above to check it against your own measurement.
What size band does the Amazfit Bip U take?
20mm. Any 20mm strap fits, so you are not limited to Amazfit's own bands — look for a quick-release fitting if you want to swap without tools.
How long does the Amazfit Bip U battery last?
Amazfit rates it at 9 days per charge in everyday use.
How does the Amazfit Bip U battery compare with other Amazfit watches?
At 9 days in everyday use it ranks #40 of the 54 Amazfit watches in our database — below the middle of the range. The full ranking, including GPS and power-saving figures, is on our Amazfit battery life comparison.
Is the Amazfit Bip U thick for a 36mm watch?
At 11.4mm, thicker than 76% of 36mm 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 Amazfit Bip U?
Zenith Defy Skyline 36 Stainless Steel - Diamond / Silver, Apple Watch Series 11 - GPS + Cellular · Aluminium · 42mm, TAG Heuer Aquaracer Professional 300 36 Stainless Steel / Blue Gradient - Diamond / Rubber, Tissot Seastar 1000 36 Quartz Stainless Steel - Rose Gold / Black / Bracelet all sit within half a millimetre of the Amazfit Bip U's 35.5mm case, so they cover the same amount of wrist.
What is the lug-to-lug of the Amazfit Bip U?
40.9mm, against a 35.5mm 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.
