GPS Speedometer — Speed Test
A free GPS speedometer and speed test for any vehicle — car, bike, train, boat or on foot. See your live speed in km/h, mph or knots, plus max speed, average speed and distance. Runs in your browser — your location never leaves your device.
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.
Measure your speed in 3 steps
Open the tool and tap Start. Your browser will ask for location access — tap Allow so GPS can read your speed.
The speed updates in real time as you move. Prop the phone where you can see it, or turn on HUD mode for the dashboard.
See live speed plus your max speed, average speed and distance travelled. Switch between km/h, mph and knots any time.
Where this speedometer helps
Check your real speed when the vehicle's own speedometer seems off, or on a bike or scooter that has none.
See how fast your train, bus or metro is really going — sit by a window and watch the live speed and the journey's top speed.
Track your pace and top speed on a ride or run, with distance covered.
Measure speed over water in knots, or on any outdoor activity where you want an accurate reading.
Compare your car's speedometer against GPS, which most vehicles read slightly high.
Benefits
- Real-time speed from GPS, shown in km/h, mph or knots.
- Max speed, average speed and distance travelled, all tracked live.
- HUD mode mirrors the display to reflect in your windshield.
- Works in your browser — nothing to install, and your location never leaves your device.
How a GPS speedometer actually works
A GPS speedometer doesn't measure your speed directly the way a car's mechanical speedometer does (which reads the rotation of a wheel or transmission gear). Instead, your phone's GPS chip receives signals from multiple satellites and calculates your exact position — latitude, longitude and altitude — several times a second. By comparing how far your position has moved between two of those readings, and dividing that distance by the time elapsed, it works out your speed. Most modern phones also read a small Doppler shift in the satellite signal itself (caused by your motion relative to the satellite), which gives an even faster, more direct speed reading than position-differencing alone.
This is why GPS speed can sometimes differ slightly from a vehicle's built-in speedometer — car manufacturers commonly calibrate speedometers to read a few percent high (a safety margin, and in some countries a regulatory requirement), while GPS gives a genuinely neutral, satellite-based reading. GPS accuracy also depends on signal quality: open sky gives the best results, while tunnels, tall buildings, or dense tree cover can momentarily reduce precision.
For the same reason, a 0–100 km/h or 0–60 mph test measured by GPS is a real, physics-based timing of your acceleration — not a simulation. The tool starts the clock the instant your GPS-derived speed leaves zero and stops it the instant you cross the target speed, giving a consistent, repeatable way to compare runs.
Speed for every vehicle & unit
Frequently asked questions
How accurate is the GPS speedometer?
Modern phone GPS is very accurate for speed — typically within about 1 km/h when you have a clear view of the sky and are moving steadily. It reads speed directly from the GPS signal (the same Doppler method sat-nav uses), not just distance over time. Accuracy drops in tunnels, dense cities and under heavy tree cover, where the signal is weaker.
Does it work without an internet connection?
Yes. GPS itself doesn't need the internet — it uses satellites. Once the page is open, speed is measured from GPS on your device, so it keeps working offline. A connection only helps the first fix lock on a little faster.
Why does the speedometer show 0 km/h?
It shows 0 when you're not moving, or before GPS has locked on. If it stays at 0 while you're moving, you're likely indoors or somewhere with a weak signal — move to an open area, and make sure location access is allowed and GPS is switched on.
What speed units are supported?
Kilometres per hour (km/h), miles per hour (mph) and knots. Tap the unit at the top to switch — max speed, average and distance all update to match.
Is the GPS speedometer free?
Yes, it's completely free with no sign-up, no app to install and no watermark. Everything runs right in your browser.
Does it drain the battery?
Keeping GPS and the screen on does use battery, like any navigation or map app. To save power, lower your screen brightness and tap Stop when you're not measuring. Charging while you use it in a car is a good idea on long trips.
How do I enable location services?
When you tap Start, your browser asks for location — tap Allow. If you blocked it earlier, open the site permissions (the padlock icon in the address bar, or your phone's app settings) and set Location to Allow, then tap Start again. Also make sure your phone's GPS/Location toggle is on.
Can I use it for cycling, boating or sports?
Yes. It works for any moving activity — cycling, running, driving, boating (use knots) or other sports. It measures your speed over the ground regardless of the vehicle.
What is HUD mode?
HUD (head-up display) mode mirrors the numbers left-to-right and enlarges them. Place your phone flat on the dashboard and the display reflects the right way round in your windshield, so you can read your speed without looking down.
Can I check my train's speed with it?
Yes — it's a popular way to see how fast a train is going. Sit near a window for the best signal and tap Start; you'll see the live speed and the top speed of the journey. GPS works well on trains because of the large windows and open routes, though it can dip briefly in tunnels.
Does it work in every country?
Yes. GPS is a global system, so the speedometer works anywhere in the world, in km/h, mph or knots. There are no regional limits and no setup — just open it and tap Start.
Is there a difference between GPS speed and my car's speedometer?
Often, yes. Car speedometers are legally allowed to read a little high (they must never read low), so they usually show a few km/h more than your true speed. GPS measures your actual speed over the ground, which is why it can read slightly lower than the dashboard.
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