Automotive Calculators & Converters
Save to PinterestFive automotive calculators and converters: a tire size calculator that derives sidewall height, overall diameter, and circumference from a P-series code; a torque converter spanning Newton-meters, foot-pounds, inch-pounds, and kilogram-force meters; a horsepower converter handling mechanical hp, kilowatts, and metric PS; a 0–60 mph to 0–100 km/h estimator using constant-acceleration math with an explanation of why the two tests are not equivalent; and a tire pressure converter between PSI, bar, and kilopascals. All unit conversions use NIST SP 811-sourced factors.
All Automotive Tools
Tire Size Calculator — Sidewall, Diameter, and Circumference
Calculate tire sidewall height, overall diameter, and circumference from a P225/65R17-style code. Results in mm and inches.
Torque Converter — Nm, ft-lb, in-lb, kgf·m
Convert torque between Newton-meters (Nm), foot-pounds (ft-lb), inch-pounds (in-lb), and kilogram-force meters (kgf·m). NIST-sourced factors.
Horsepower Converter — hp, kW, PS (Metric HP)
Convert between mechanical horsepower (hp), kilowatts (kW), and metric horsepower (PS/CV). NIST-sourced conversion factors.
0–60 mph to 0–100 km/h Time Converter — Constant Acceleration
Estimate 0–100 km/h acceleration time from a 0–60 mph figure using constant-acceleration math. Explains why the two tests differ.
Tire Pressure Converter — psi, bar, kPa
Convert tire pressure between PSI, bar, and kilopascals (kPa). NIST-sourced factors. Includes typical passenger car pressure ranges.