About TireCalculatorPro
TireCalculatorPro is a free set of tire and wheel calculators covering size comparison, pressure conversion, DOT date decoding, load index, speed rating, and vehicle-specific fitment — every tool runs instantly in the browser, with no account and no signup.
What this site does
Every calculator on this site solves one specific tire or wheel question — how a size change affects speedometer reading, what a DOT date code means, whether a tire fits a given rim width, how much load a tire can carry. Formulas are based on published tire industry standards (metric sidewall math, ISO/ETRTO fitment ranges, DOT date coding) rather than guesswork.
What it covers
4 topic areas, from general tire size math to vehicle-specific fitment guides for the Tacoma, F-150, Jeep, BMW, Audi, Lexus, Miata, Subaru, and Tesla.
Where the AI Insight comes from
Some calculators offer an optional “Get AI Insight” button that sends your inputs to a language model for a plain-language read on the result. That output is generated on request, never automatically, and is labeled as AI-generated wherever it appears. For safety-critical decisions — load ratings, speed ratings, tire age — check the number itself and confirm against your tire's sidewall or owner's manual.
Accuracy and limits
These calculators are built for estimation and reference, not certification. Tire and rim fitment always depends on the specific vehicle, wheel, and suspension setup — check a tire shop or your vehicle's manual before making a purchase decision. See the Terms of Service for full details.
No account, no login, no paywall — every calculator is free to use.