Live GPS speed test
Online GPS Speedometer
Use Zpeed to check your current speed, trip distance, and GPS accuracy from your browser.
km/h
Tap Start tracking to give location access.
Location stays on your device.
Works offline after you add it.
Built for the road
Six reasons people open Zpeed.
Verify your dash.
Your phone's GPS gives a precise digital readout — useful when you want to see how closely your vehicle's display matches actual speed.
Speed without hardware.
Mount your phone on the bars and read live pace without pairing a sensor or magnet. Works as long as you have open sky above you.
Know your outdoor pace.
Track km/h or mph in real time on outdoor runs. GPS measures movement across the ground — it won't register on a treadmill.
On the water, too.
GPS signal is just as reliable over open water as on land. Cross-check your vessel's display without any extra equipment.
Your peak on that run.
Carry your phone down the slope and check your top speed after you reach the bottom. No installation or pairing required.
Train, bus, or ferry.
Sit back on any vehicle and see exactly how fast you're moving. No app needed — just a browser and a clear signal.
Behind the speed
What your phone actually measures.
When you tap Start tracking, your browser asks for location permission on Zpeed's behalf. Once you grant it, the browser's Geolocation API begins delivering a stream of position fixes from your device's GPS chip — typically a few times per second. Each fix includes a derived speed value your device calculates from how far it has moved between readings.
Zpeed scales that speed value to the display, applies a light smoothing pass so the reading updates cleanly, and shows it in your chosen unit — km/h, mph, or m/s. Everything runs locally in your browser tab. Your coordinates are never sent to any server and no account is required.
Accuracy is highest outdoors with a clear view of the sky. In tunnels, indoors, or between tall buildings, the GPS signal weakens and the status indicator switches from "GPS Ready" to "Acquiring" until it recovers. Because GPS tracks real geographic movement, it works on roads, water, and open trails — but not on a treadmill, where your physical position on Earth doesn't change.
Fast tool, useful context
Zpeed - Online Speedometer & Live Vehicle Speed Test
Want to know how fast you're going right now? Zpeed is a free, online speedometer that instantly shows your current speed in km/h—no app install needed! Whether you're on a train, bus, car, bike, or just curious about your travel speed, Zpeed tracks your live speed in real-time using GPS.
GPS speedometer uses
Speed units
- km/h for most road and rail journeys
- mph for miles-based regions
- m/s for technical measurement
- mph to km/h converter and km/h to mph converter
Best results
For best results, use Zpeed outdoors or near a window with high accuracy location enabled.
Good to know
Things worth knowing.
01 How accurate is a GPS-based browser speedometer? ⌄
In open sky, modern phones fix your position to within 10–40 metres. Speed is derived from successive position readings, so at typical road or cycling speeds the result is very close to actual. Accuracy drops in tunnels, indoors, or between tall buildings.
02 Does it work without an internet connection? ⌄
Once loaded, yes. Zpeed is a Progressive Web App — add it to your home screen and the speedometer is cached and available offline. GPS works independently of your internet connection.
03 Why does it show 0 when I'm moving? ⌄
GPS needs a few seconds to acquire a signal after you grant permission. Once the status shows "GPS Ready", a zero reading means you are genuinely stationary from the satellite's perspective — or the signal has temporarily dropped.
04 Will it work on a treadmill? ⌄
No. GPS tracks your physical movement across the ground. On a treadmill your position doesn't change, so there's nothing for the satellites to measure. For treadmill pace, check the belt display or use a foot-pod sensor.
05 Does continuous GPS use drain my battery faster? ⌄
GPS positioning uses more power than idle browsing. For short trips it's negligible; for multi-hour sessions, keep your charger handy or add Zpeed to your home screen as a PWA to reduce overhead.
06 Why do I have to allow location permission? ⌄
The browser's Geolocation API requires your explicit consent before sharing any position data. Zpeed doesn't ask on page load — you trigger it by tapping Start tracking. No permission, no tracking.
07 Is my location sent anywhere? ⌄
No. Speed is calculated inside your browser using the device's GPS chip. Nothing is uploaded to a server. Zpeed does not require an account or store any location history.
08 Can I use it on a laptop or desktop? ⌄
Yes, if your device has a GPS receiver — most laptops don't. On a phone or tablet it works reliably outdoors. On a desktop without GPS hardware, the browser will report that the Geolocation API is unavailable or returns a low-accuracy result.