Car Speed Test
Check Your Car Speed
Turn your phone into a precise GPS speedometer for your car. See how your actual road speed compares to the number on the dashboard — no app install needed.
Typical car speeds
GPS speed vs. your dashboard
Car speedometers are calibrated to never under-read your speed, so they normally show 2 to 10 percent more than your real road speed. A GPS-based reading like the one above is much closer to your actual speed over ground, which is why it is often used by police speed checks and modern car infotainment systems.
Why use GPS in a car?
Beyond satisfying your curiosity about the dashboard, a GPS speedometer is useful when your car is older with no digital readout, when you are renting a foreign car with unfamiliar units, when you suspect a speedometer fault, or simply when you want a clearer, larger number to glance at on long drives.
km/h or mph at one tap
Switch between km/h, mph, knots, and m/s instantly. Useful if you drive across borders, for example between the UK (mph) and the rest of Europe (km/h), or for car enthusiasts who want their readout in m/s for physics calculations.
Tips for an accurate car speed reading
- Place your phone on the dashboard or a windshield mount so its GPS antenna can see the sky.
- Wait for the "GPS Locked" status before trusting the readings — the first few seconds are often noisy.
- For long drives, plug your phone into a charger; continuous GPS use drains the battery faster than usual.
- Never glance at the speedometer while driving alone — let a passenger watch the screen, or only check it when safely stopped.
- Tunnels and underground car parks block GPS — the reading will drop to zero until you exit.
Frequently Asked Questions
Try other vehicle modes
Pick the mode that matches your journey — every page is tuned for the kind of speeds you'll see in that vehicle.
Vehicle Speed Test
Measure the real-time speed of any vehicle using your phone or tablet GPS. Switch between km/h, mph, knots and m/s.
Bike Speed Test
Track your cycling speed on rides, commutes, or trail sessions with a smooth GPS-based readout.
Bus Speed Test
Curious how fast your bus is going? Track its live GPS speed from your seat without any extra hardware.
Train Speed Test
Check how fast your train is travelling in real time. Works on local, intercity, and high-speed rail journeys.
Metro Speed Test
Test metro and subway train speeds using GPS. The reading locks on whenever the line runs above ground.
Running Speed Test
Measure your running pace and speed without a smartwatch. Great for jogs, sprints, and outdoor workouts.
Browse every vehicle mode we support