Car Speed Test
Use your phone's GPS to measure your real-time car speed.
Free, browser-based GPS speedometer with km/h, mph, knots, top speed, distance tracking, and customizable display.
GPS Speedometer
How It Works
1. Allow Location Access
Tap Start Tracking and grant location permission. Your browser uses your device's GPS to determine position.
2. Watch Your Speed
Speed is calculated from continuous GPS readings and displayed in real time on both analog and digital views.
3. Review Your Trip
Track top speed, average speed, distance traveled, and duration. Reset anytime to start a new test.
Features
Multiple Units
Switch instantly between km/h, mph, knots, and m/s to match your region or preference.
Analog & Digital
Choose a classic analog dial, a clean digital readout, or both side-by-side.
Custom Themes
Pick from five color themes — red, blue, green, orange, or cyan — to suit your style.
Mobile First
Designed for phones in cars: large readouts, big buttons, and a fully responsive layout.
Private by Design
Your location data stays on your device. We never send GPS coordinates to any server.
No Install Needed
Runs in any modern browser. No app to download, no account to create — just open and drive.
About GPS Speed Tracking
Modern smartphones include high-precision GPS receivers that can determine your position to within a few meters. By measuring how that position changes over time, the browser's Geolocation API can report your speed directly, with no extra hardware or apps required.
Car Speed Test reads those GPS samples continuously and displays them on a customizable speedometer. Because the calculation is based on real geographic movement, it works for cars, motorcycles, bikes, boats, trains, and even planes — anywhere you have a clear view of the sky.
GPS Speedometer vs Car Speedometer
Most car speedometers read slightly high — typically 2-5% — to protect against under-reporting. A GPS-based speedometer measures your actual ground speed, which is often a more accurate reflection of how fast you are really moving.
Why Accuracy Varies
GPS accuracy depends on satellite visibility, atmospheric conditions, and your surroundings. Open highways give excellent results, while tunnels, parking garages, and dense city streets can degrade or temporarily lose the signal.
Common Speed Units
- km/h — Used in most of the world for road speed.
- mph — Common in the US and UK.
- knots — Standard for marine and aviation use.
- m/s — Used in scientific and engineering contexts.
Tips for Best Results
- Place your phone where it has a clear view of the sky.
- Allow a minute outdoors to acquire a strong satellite fix.
- Keep the screen on so the browser keeps GPS active.
- Avoid using the device in heavy power-saving mode.
Safety First
Never operate this speedometer while driving. Set it up before you start moving, or have a passenger handle it. Always obey posted speed limits and your vehicle's built-in speedometer is the official reference for legal compliance.