Urban ride
- Input
- 5,2 m/s
- Expected output
- 18,7 km/h
Typical range for commuting on flat ground.
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bike speedometer using a phone
A wheel-sensor bike computer needs calibration and a magnet on a spoke. Your phone GPS needs neither, and still gives distance, top speed and average speed without mounting anything on the bike.
Typical range for commuting on flat ground.
At this range the Doppler reading is far steadier than the displacement-derived one.
Usually yes, for a curious reason: car speedometers are deliberately optimistic. Regulations in many countries allow the instrument to read higher than the true speed but never lower, so manufacturers calibrate with margin. Dashboards commonly read 5 to 10 % high. GPS measures actual displacement and has no such bias, but it is also not the legally required instrument.
Under open sky, yes, and for speed it is usually better than a car speedometer, which is deliberately calibrated to read high. Where GPS struggles is in urban canyons between tall buildings, where the signal arrives reflected and the position jumps. The tool shows accuracy in metres so you know when to be sceptical.
You can, with a firm mount, and that is how the measurement stays most complete, since the page has to remain visible. Just remember that high-accuracy GPS with the screen on is among the heaviest battery consumers on a phone, so bring a charger on long rides.
Tap to turn on GPS. Your location is used only to compute the result on this screen and is never sent to our servers.
If you are driving, do not look at your phone. Use the vehicle own speedometer, which is the legally required instrument, and save this tool for when you are a passenger, on foot, on a bike, or stopped.
Your position is used only on this screen to compute speed and distance. No coordinate and no track leaves your browser, and nothing is stored when the page closes.