Precision tools for drivers, buyers, and gearheads.
carcalc.site is a free collection of automotive calculators built for anyone who owns, buys, or works on cars. No accounts, no ads in the way, no subscription required.
Precision First
Every formula is verified against real-world automotive data, SAE standards, and established engineering principles.
Built for Everyone
Designed for car buyers, daily drivers, weekend enthusiasts, and professional mechanics who need accurate answers fast.
Always Free
No paywalls, no account required, no premium tiers. Every calculator on carcalc.site is free to use, always.
The Story
carcalc.site started from a simple frustration: automotive calculators online were either buried in cluttered dealership sites, locked behind signups, or just inaccurate. Car buyers and drivers deserve better tools.
We are building a comprehensive library of automotive calculators that are fast, accurate, and free. Each tool covers a real decision drivers face - from comparing tire sizes and estimating loan payments, to calculating towing capacity and fuel costs.
All calculations follow real automotive engineering formulas and industry standards. If you spot an error or want to suggest a tool, we want to hear from you.