Car Speedometer — GPS Speed Test
Use your phone as an accurate car speedometer with GPS. Check your real speed, top speed and distance, or test your car's speedometer for accuracy. Free, nothing uploaded.
Wait for a stronger GPS signal for an accurate time.
Tap Start and allow location. Works best outdoors with a clear view of the sky. Your location stays on your device — nothing is uploaded.
More speedometer options
Frequently asked questions
Can I check if my car's speedometer is accurate?
Yes — run this GPS speedometer alongside your dashboard. Most car speedometers read a few km/h high by design, so GPS usually shows a slightly lower, truer speed. It's handy in a rental or unfamiliar car too. Everything runs in your browser — your location never leaves your device.
My car's speedometer is broken — can I use this instead?
It's a useful temporary backup if your speedometer has failed, and works in any car including rentals. But a working built-in speedometer is a legal requirement, so get it repaired rather than relying on your phone permanently.