GPS speedometer

Online Speedometer

How fast am I going right now? Open this page on your phone, press Start and see your live GPS speed in km/h, mph, knots or m/s — with your top speed, moving average, distance and trip time. No app, no sign-up.

GPS off

0KM/H

Max speed: —
Avg (moving): —
Distance: —
Trip time: —
Moving time: —
Heading: —
Altitude: —

Set Speed Alert

Speed limitkm/h

Beep and vibrate when exceeding this speed.

Trip log

No points recorded yet

Live GPS speed
km/h, mph, knots & m/s
Max & moving average
Speed alert
HUD windshield mode
Location stays on your device

Modes

Specialized Modes for Every Vehicle

Optimized gauges and units for cars, bicycles, public transport, rail, and aviation.

Car Speed Test

Check your true speed against the dashboard, with HUD mirror mode and speed alerts.

Open Test

Bike Speed Test

Speed, distance and moving average for bicycles, e-bikes and motorbikes.

Open Test

Bus Speed Test

Check how fast your bus or coach is going from your seat, with GPS accuracy shown.

Open Test

Train Speed Test

See how fast your train is really going — from commuter lines to 300 km/h high-speed rail.

Open Test

Flight Speed Test

Ground speed, altitude and heading at 35,000 ft — works in airplane mode.

Open Test

How it works

How an Online Speedometer Measures Your Speed

01
Open on Mobile
Visit on your smartphone with GPS enabled and open sky view.
02
Tap Start
Grant browser location permission when prompted. Doppler satellite tracking begins immediately.
03
Read Live Speed
Monitor real-time velocity, trip distance, top speed, and moving average with zero telemetry.

Satellite Precision

Why GPS Speed Is More Accurate Than Car Dashboards

Car speedometers are legally calibrated to over-report speed. Satellite Doppler calculations reflect your true ground velocity.

Doppler Frequency Shift

GNSS receivers calculate velocity by measuring radio frequency shifts from satellites moving overhead, accurate within 1–2 km/h.

No Wheel Circumference Error

Tire wear, inflation pressure, and aftermarket wheels distort mechanical speedometers, but have zero effect on GPS ground speed.

Car Speed Test.

Night Driving

Heads-Up Display (HUD) Mode

Mirror high-contrast digits onto your car windshield at night.

Tap HUD Mode and place your phone flat on the dashboard beneath the windshield. The inverted numbers reflect off the glass, keeping your eyes on the road.

Guidance

Tips for Getting the Best GPS Signal

Position your phone near the windshield or window for unobstructed view of the sky.

Keep the browser tab in the foreground so the Screen Wake Lock keeps your display awake.

Avoid deep tunnels or multi-story parking garages where satellite signals cannot penetrate.

Always secure your mobile device in a dedicated vehicle mount while driving.

Units

km/h, mph, Knots & m/s

1 mph = 1.609 km/h · 1 knot = 1.852 km/h · 1 m/s = 3.6 km/h.

Common speeds in km/h, mph, knots and metres per second
km/h	mph	Knots	m/s
10 km/h	6.2 mph	5.4 kn	2.8 m/s
30 km/h	19 mph	16 kn	8.3 m/s
50 km/h	31 mph	27 kn	14 m/s
80 km/h	50 mph	43 kn	22 m/s
100 km/h	62 mph	54 kn	28 m/s
120 km/h	75 mph	65 kn	33 m/s
300 km/h	186 mph	162 kn	83 m/s
900 km/h	559 mph	486 kn	250 m/s

1 mph = 1.609344 km/h · 1 knot = 1.852 km/h · 1 m/s = 3.6 km/h.

FAQ