Speed tools
Car & Bike Speedometers, Fuel Cost & Wheel Offset Tools
Live GPS speedometers for car, motorbike and bicycle, plus trip fuel cost, wheel offset and HUD tools.
Bike SpeedometerFree online bike speedometer: live GPS speed, max and average for bicycles, motorcycles and scooters in mph or km/h, plus a wheel size chart for bike computers.Open tool 
Car SpeedometerFree online car speedometer: your phone's GPS shows true speed in km/h or mph. Check a broken or inaccurate dash, use HUD mode, learn how car speedometers work.Open tool 
Fuel Cost CalculatorFree fuel cost calculator: trip gas cost from distance, mpg or L/100 km and fuel price, with round trip, cost per mile and cost split per person.Open tool 
GPS vs Car SpeedometerSpeedometer accuracy explained: why car speedometers read high, the legal limits, how tires change it, and a free GPS speedometer to test your car in mph.Open tool 
HUD SpeedometerFree HUD app in your browser: lay your phone under the windshield and see your GPS speed reflected in mph or km/h. Setup, night tips, legality. No download.Open tool 
Wheel Offset CalculatorFree wheel offset calculator: compare two wheels by width and ET offset, get backspacing and see how far the new wheel pokes out or tucks in, in mm and inches.Open tool FAQ
Frequently asked questions
Can I use my phone as a car speedometer?
Yes. Open the speedometer in your phone browser, tap Start and allow location. Mount the phone where it can see the sky and set it up before driving.
Why is my car speedometer higher than GPS?
Regulations let car speedometers read high but never low, so most show 2–7% above true speed. GPS measures speed over ground directly.
Does it work for motorbikes?
Yes. Use a secure handlebar mount and set it up before riding.
Looking for something else? Browse all 38 speed tools or start with the online speedometer.