THE MATHBEHIND YOURMACHINE
Free, pro-grade calculators for gearheads, mechanics,
and everyday drivers. No BS.
Why CarMath?
We built the calculators we wished existed. No BS, just useful tools.
Accurate Formulas
Industry-standard calculations documented in our methodology section. No black boxes.
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Fast & Clean
Just fast calculators that work on any device.
Popular Calculators
The tools our users love most
Tire Size & Speedo
Calculate diameter change and speedometer error for lifted or modded vehicles.
Quarter Mile Predictor
Estimate your ET and trap speed from horsepower and weight.
Wheel Fitment
Check offset, poke, and fender clearance for wheel swaps.
Out-the-Door Price
Calculate the true cash price including tax, title, and hidden fees.
Engine Displacement
Calculate CC or cubic inches from bore, stroke, and cylinders.
Commute Cost
Find the true cost of your daily drive including gas, wear, and depreciation.
Frequently Asked Questions
Quick answers to common questions
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