About Car & Driving Calculators

Last updated June 5, 2026

I drive a lot and like knowing what it actually costs. These are the fuel-cost, tire-size, and EV-charging calculators I use — each one shows the arithmetic instead of hiding it.

What’s on this site

Right now there are 6 calculators here: Gas Trip Cost Calculator, Tire Size Calculator, EV Charging Cost Calculator, MPG Calculator, Cost Per Mile Calculator, and Car Depreciation Calculator. Each one is a single-purpose tool that shows its formula, lists its assumptions, and runs on any device with no signup.

Why these are different

Most calculator sites hand you a number and hide the formula. Every tool here does the opposite: the exact formula, the assumptions, and a worked example are shown right on the page, so you can check the result instead of trusting it blindly. There’s no account, no paywall, and no signup.

How the math is kept honest

Each formula is shown in full and was independently re-derived and spot-checked against the calculator’s code. Reference values (typical rates, averages, rules of thumb) are labeled as approximate and are editable, so you can put in your own real numbers. These are cost and sizing estimates, not mechanical or financial advice — confirm tire fitment and big purchases with a professional.

Found a mistake?

I’d genuinely like to know. Email [email protected] and I’ll fix it.