Car calculators
Four calculators for the questions we get most. Each one shows its working and links its sources.
- Wheel offset calculatorCompare two wheels and see how far each edge moves, plus backspacing and a fitment verdict.
- Tire size calculatorCompare two tire sizes: diameter, revs per mile and what your speedometer will read.
- Japan import cost calculatorLanded cost of a car from Japan to the US or UK, with duty, tariffs, VAT and fees itemized.
- Gear ratio calculatorRPM at any speed and top speed at redline in every gear, with a speed vs RPM chart.