Car Calculators
Ten free tools for tire fitment, ownership costs, and driving physics. Everything runs in your browser, nothing is sent anywhere.
Tire Size Calculator
Compare two tire sizes to see the difference in overall diameter and speedometer error.
Wheel Offset Calculator
Estimate backspacing from wheel width and offset, or the reverse.
Backspacing = (wheel width / 2) + (offset in mm / 25.4) + 0.5". Standard approximation used by wheel shops, not a substitute for a physical fitment check.
Wheel Fitment: Bolt Pattern Reference
Convert bolt pattern between inches and millimeters, and check common patterns for a few popular platforms.
Reference: Toyota GR86 is 5x100, most modern BMW 3/5-Series are 5x120, Audi A8 is 5x112. Always confirm against your specific model year before buying wheels.
Fuel Cost Calculator
Estimate the fuel cost of a trip.
Car Loan Calculator
Estimate your monthly payment on an auto loan.
Insurance Cost Estimator
A rough ballpark estimate based on general rating factors. This is not a quote, real premiums depend on your specific insurer, state, and driving record.
EV Charging Cost Calculator
Estimate the cost of a full charge and cost per mile.
CO2 Emissions Calculator
Estimate emissions from fuel burned on a trip.
Based on 8.887 kg CO2 per gallon of gasoline burned (EPA emission factor).
Braking Distance Calculator
Estimate stopping distance including reaction time.
Simplified physics model (v² / 2μg + reaction distance). Real stopping distance depends on tires, brakes, weight, and vehicle condition.
Car Depreciation Calculator
Project a car's value forward using a constant annual depreciation rate.