Free Tire & Wheel Calculators
Decode your tire size, set the right pressure, estimate tread life and budget, check wheel fitment and understand your TPMS warning — all free, no registration.
Tire Size Calculator
Work out tire dimensions from the sidewall markings (e.g. 205/55 R16).
Open calculator →Tire Pressure Calculator
Recommended tyre pressures based on vehicle type and load.
Open calculator →Tire Replacement Calculator
Estimate how many kilometres and months your tires have left.
Open calculator →Tire Cost Calculator
Build your annual tire budget from set price and lifespan.
Open calculator →Winter Tire Calculator
When to switch to winter tires based on temperature and conditions.
Open calculator →Tire Load Index Decoder
Decode 91V, 95Y — the number is the load index.
Open calculator →Tire Speed Rating Decoder
Decode H, V, W, Y — the letter is the certified speed.
Open calculator →Wheel Offset Calculator
Compare current and new ET — how the wheel position changes.
Open calculator →Wheel Fitment Calculator
Check whether a tire width fits your rim width.
Open calculator →Bolt Pattern Finder
Enter your vehicle and get the wheel bolt pattern (PCD).
Open calculator →Tire Diameter Calculator
Compare two tire sizes — diameter, difference and speedometer impact.
Open calculator →Tire Pressure Conversion
Convert PSI, bar and kPa instantly.
Open calculator →Tire Age Calculator
Read the DOT code and interpret your tire age.
Open calculator →TPMS Checker
Diagnose what your tire-pressure warning light means.
Open calculator →Wheel & Tire Visualizer
Visualize how wheel width and offset position the tire on your car.
Open calculator →Stay safe and save money with your tires
- Check pressure monthly, cold — under-inflated tires wear faster, use more fuel and handle worse.
- Measure tread depth — the legal minimum is usually 1.6 mm, but winter tires should go sooner.
- Know your size code — the numbers and letters on the sidewall (205/55 R16 91V) define fitment and capability.
- Verify before you buy wheels — bolt pattern (PCD), offset (ET), hub bore and width all matter, not just the diameter.
- Respect tire age — tires degrade from age even with good tread; the DOT code tells you when they were made.