Automotive
31 free automotive tools in the Calculators & Converters collection — every one runs in your browser with no signup and no uploads.
Australia Pension & Retirement Calculator
Project your Australia retirement income using the local pension system rules.
Automotive Gear Ratio & Speed Calculator
Calculate vehicle speed from RPM, gear ratio, final drive, and tire size
Boiler Horsepower & Steam Output Calculator
Convert boiler horsepower to BTU/h, kW, and lbs/hr of steam, plus reverse from kW
Engineering Notation Converter
Express numbers in engineering notation (exponents of 3)
G-Code Speed & Feedrate Calculator
Convert mm/s print speeds to G-code feedrate (mm/min) values
Golf Green Speed (Stimpmeter) Calculator
Estimate green speed from a Stimpmeter reading.
Hunting Wind Chill & Effective Temperature Calculator
Calculate wind chill and the clothing layers you need to hunt in the cold
Lathe Turning Horsepower Calculator
Estimate required lathe HP for a turning pass from depth of cut, feed, and material
Milling Horsepower Calculator
Estimate spindle power required for a face-milling or end-milling cut
Motor Horsepower to kW Converter
Convert mechanical, metric, and electrical horsepower to kW, plus shaft torque
Plasma Cut Speed Calculator
Find optimal plasma cut speed (IPM) for any steel thickness and amperage
True Airspeed (TAS) Calculator
Calculate true airspeed from indicated airspeed, altitude, and temperature
MIG Wire Feed Speed Calculator
Calculate deposition rate and wire-feed speed from amperage and wire diameter
FIRE Retirement Calculator
Find your FIRE number and how long until you reach it.
Horsepower to Watts Converter
Convert mechanical horsepower to watts and back, instantly.
Retirement & FIRE Planner
Project your portfolio to retirement, find your FIRE number, and see if it lasts.
Retirement Countdown
Live countdown to the day you reach your target retirement age.
Ackermann Angle Calculator
Calculate ideal inner and outer steer angles, turning radius and Ackermann percentage for any vehicle geometry.
Brake Horsepower Calculator
Calculate BHP from torque and RPM, a Prony brake, or BMEP — with full step-by-step working.
Engine CC to HP Calculator
Convert engine displacement to horsepower using four engineering methods.
Engine Displacement Calculator
Calculate engine displacement, bore, stroke or cylinder count from any three variables.
Horsepower to Torque Calculator
Convert between horsepower, torque and RPM with full step-by-step working.
Intercooler Calculator
Calculate charge-air temperature drop, pressure loss, density gain and estimated power increase from your intercooler.
Quarter-Mile Calculator
Predict your drag-strip ET and trap speed from horsepower and weight.
Tire Diameter Calculator
Find overall diameter, sidewall, circumference and revs/mile — plus speedometer correction when swapping sizes.
Wheel Offset Calculator
Calculate backspacing, lip clearance and track change from ET offset.
0-60 mph Estimator
Estimate your car''s 0–60 mph time from weight and horsepower.
Boost Pressure Calculator
Convert boost gauge readings, solve pressure ratio, model charge-air density and check injector duty cycle — all in your browser.
Gear Ratio & Speed Calculator
Work out vehicle speed, RPM, gear ratios and final drive from tyre size and transmission data.
Speedometer Error Calculator
Find out how inaccurate your speedo really is — and what your true speed is.
Volumetric Efficiency Calculator
Measure how well your engine breathes — four methods, instant results.