Tyres & Wheels Calculators
Calculate tyre sizes, diameters, wheel offsets, speedometer corrections, and tyre pressure.
Tyre Size Calculator
Decode tyre size markings and find compatible alternative sizes.
Tyre Diameter Calculator
Calculate the overall diameter of any tyre from its size code.
Tyre Width Comparison Calculator
Compare two tyre sizes and see the differences in width, diameter, and circumference.
Wheel Offset Calculator
Calculate wheel offset and see how different offsets affect your wheel position.
Speedometer Correction Calculator
Find out how changing tyre size affects your speedometer reading.
Tyre Pressure Calculator
Convert tyre pressures between PSI, bar, and kPa.
Tyre Wear Calculator
Estimate remaining tyre life based on current tread depth and wear rate.
Bolt Pattern Calculator
Calculate bolt pattern PCD from measurements between wheel studs.
Wheel Spacer Calculator
Work out what thickness wheel spacers you need for your desired offset.
Tyre Age Calculator
Decode the DOT date code on your tyres to find their age.
10 free calculators in Tyres & Wheels
Free Tyre and Wheel Calculators for Every Driver
Choosing the right tyres and wheels affects everything from ride comfort and handling to fuel economy and speedometer accuracy. Our tyre and wheel calculators help you decode tyre markings, compare sizes, and ensure any changes you make are safe and legal.
The tyre size calculator breaks down the meaning of tyre codes like 205/55R16 and shows you the actual dimensions in millimetres. If you are considering a different tyre size, the speedometer correction calculator shows you exactly how your speedo reading will change, helping you stay within the law.
For wheel upgrades, the wheel offset calculator helps you avoid rubbing and ensure proper clearance, while the bolt pattern calculator lets you work out your PCD from simple measurements. Understanding these numbers means you can confidently shop for wheels that fit perfectly.