Free GPS Speedometer Online, No App Needed
This GPS speedometer turns your phone into a live speed meter. Open the page, press Start, allow location, and your current speed appears on the dial within a few seconds, in km/h, mph, knots or m/s. It works in any current mobile browser on iPhone or Android, so there is no speedometer app to download, no account to create and nothing to pay.
Whenever you wonder "how fast am I going?", the online speedometer gives an answer that does not depend on the vehicle. The reading comes from the satellites rather than from wheels or a cable, so it shows your true speed over the ground: from a passenger seat, on a bike or e-scooter with no display, on a boat, on a walk or a run, or at a train window.
How to Check Your Speed Online
- Press Start. Your browser asks for permission to use your location; tap Allow. On an iPhone, Precise Location has to stay on, or the speed cannot be worked out.
- Wait for the signal chip. The label above the dial changes from searching to a GPS fix and shows how accurate each position is. Out in the open this takes seconds.
- Fix the phone in place before moving. In a car, use a dashboard or windscreen holder and pick the unit and alert while parked. The screen stays awake while the speedometer is tracking, where the browser allows it.
- Pause or reset when you arrive. Pause stops tracking and keeps your trip; Reset trip clears the top speed, distance and time for the next journey.
No speed at all? The guide to a GPS speedometer that is not working covers blocked location, Precise Location and weak signals on iPhone, Android and laptops.
How Does a GPS Speedometer Work?
Satellite navigation receivers measure speed directly. As you move, the frequency of each satellite's signal shifts very slightly (the Doppler effect), and the receiver turns those shifts into a velocity. Because it does not rely on comparing two positions, that speed stays steady even when the position itself wanders by a few metres. The browser hands the value to the page through the Geolocation API, usually once a second, and the dial shows it as it arrives.
Laptops and some tablets locate themselves by Wi-Fi and report no speed. In that case the speedometer estimates it from how your position changes over the last few seconds and says so on screen. That estimate is rougher, so for a proper speed check, use a phone outdoors.
Speedometer in km/h, mph, Knots and m/s
One tap switches the unit, and the dial, trip computer and speed alert all follow. Pick kilometres per hour with distance in kilometres, miles per hour with miles (and altitude in feet), knots with nautical miles, or metres per second. The dial opens at 0–180 km/h (0–120 mph), like a car's, and rescales by itself at higher speeds, all the way to 1,200 km/h. To change a number you already have from km/h to mph, or into running pace, use the speed converter.
One Speedometer for Every Trip
- Car: see your real driving speed, and find out how far the dashboard reads high, with the car speed test.
- Bike and e-scooter: a bike speedometer with no sensor or wiring. Put the phone in a handlebar mount and read speed, distance and average speed as you ride.
- Walking and running: check your walking or running speed, then turn it into pace per kilometre or per mile with the converter.
- Boat: switch to knots for a boat speedometer that logs distance in nautical miles.
- Train and bus: the train speed test starts its dial at 0–300 km/h for high-speed rail, and the bus speed test times door-to-door journeys, stops included.
HUD Speedometer Mode for Night Driving
HUD mode fills the screen with your speed in large digits, white on black, readable at a glance from a holder or across a cabin. With Mirror on and the phone lying face up below the windscreen at night, the glass reflects the digits the right way round, like a head-up display. The car speed test explains the windscreen set-up step by step.
Trip Computer: Top Speed, Average Speed and Distance
While it runs, the speedometer records your top speed, average speed, trip distance and trip time. The average uses moving time only, so waiting at lights or in traffic does not pull it down, and anything below 1.8 km/h counts as stopped. Fixes less precise than 30 m stay out of the totals, and the top speed is the median of 3 consecutive readings, so a single GPS glitch cannot set a record you never reached.
Speed Limit Alert
Turn on the speed alert, enter a limit in your chosen unit, and the speedometer warns you when you go over it: the dial turns red and a double beep sounds every 5 seconds for as long as you stay above it. Android phones can vibrate as well. GPS is never perfect, so a limit slightly under the one on the sign gives you a margin.
Is a GPS Speedometer Accurate?
Under an open sky, phone GPS is normally good enough to test a car's speedometer with. It is less reliable among tall buildings, under thick trees and just after a tunnel, and the signal chip tells you how precise each fix is, so you can judge. If your car reads a few km/h higher than GPS, that is normal: speedometers are designed never to under-read. The GPS speedometer accuracy guide explains the numbers, and the speedometer check tells you whether your car's gap is within the rules.
Limits of an Online Speedometer
- No sky, no speed. Inside buildings, in tunnels and in underground car parks the satellites are out of reach, and tall buildings reduce accuracy.
- The page has to stay open. Browsers pause location for pages in the background or behind a locked screen, so keep the speedometer in front.
- A reference, not a certified instrument. Do not rely on it as evidence of your speed. Posted limits and your vehicle's own instruments always come first.
Your Location Stays on Your Phone
The speedometer works out your speed and distance inside your browser and forgets each position once it has been used; closing the page clears the rest. No location is sent to a server and no route history is stored. The privacy notice lists the few preferences kept on your device, and the speedometer FAQ answers more questions on accuracy, units, HUD mode and troubleshooting.