A free vehicle speed meter for any vehicle: car, bike, scooter, auto-rickshaw, truck or tractor. Your phone GPS shows the true speed, so you can test whether the speedometer on your dashboard is telling the truth.
Tap Start GPS and allow location access
Put your phone in a holder or give it to a passenger, tap Start GPS and drive normally. The gauge shows your real ground speed every second. Hold a steady speed for 10 to 15 seconds on a straight, level road and compare the GPS number with the speedometer in your vehicle.
| Vehicle | What the test is useful for |
|---|---|
| Car or SUV | Checking speedometer error after new tyres or wheels |
| Motorcycle or scooter | Two-wheeler speedometers often read high |
| Auto-rickshaw or e-rickshaw | Many have no working speedometer at all |
| Truck, tractor or bus | Checking against a speed limiter setting |
| Bicycle or e-bike | A speed meter without buying a bike computer |
Vehicle speedometers count wheel turns, so tyre size and wear change the reading. Makers also set them to read a little high on purpose, because the rules allow a speedometer to over-read but never to under-read. A gap of 2 to 8 km/h at highway speed is normal. GPS measures how fast you actually move over the ground, so it is the better reference.
Driving a car? The car speed test has more on dashboard error. Riding? Try the motorcycle speed checker.
Tap Start GPS and allow location access. The page turns your phone into a vehicle speed meter that shows live speed, top speed, average speed and distance in km/h or mph. It works in any vehicle and needs no app.
Pick a straight, flat road with a clear view of the sky. Set a steady speed, for example 60 km/h on the speedometer, and hold it. Read the GPS speed once the accuracy figure at the top of the gauge is small. If GPS says 56 km/h, your speedometer reads about 7% high. Repeat at 40 and 80 km/h to see whether the error grows with speed.
Tap the Alert button on the gauge, enter a limit and switch it on. The page warns you when you go over that speed, which is handy for a new driver, a speed-limited vehicle or a road with a strict limit.
Never hold or look at your phone while driving. Mount it, set it up before you move, or let a passenger read the speed. Drive mode makes the numbers large enough to read at a glance.
Open this page on your phone, tap Start GPS and allow location access. The gauge shows your real speed while you drive, and you can compare it with your vehicle speedometer.
Usually, yes. With a clear sky, phone GPS is accurate to about 1 to 2 km/h at a steady speed. Speedometers are set to read high and change with tyre size and wear.
Speedometers are allowed to over-read but not to under-read, so manufacturers set them a little high. Worn or smaller tyres add to the difference.
Yes. It works for any vehicle, including two-wheelers, autos and bicycles. Use a phone mount so you do not need to hold the phone.
Only to load the page. After that, GPS works without mobile data.