Car & driving calculators
Fuel, tires, loans, leases and towing — worked out for your car and your numbers.
19 calculators for the money and the physics of owning a car in the US: what a road trip costs in gas, what your truck really gets per gallon, whether bigger tires throw off the speedometer, what an auto loan or a lease costs in total, and how heavy a trailer your pickup can actually pull. Each one updates as you type, remembers your last numbers, and gives you a link that reopens exactly your case.
Fuel & trip costs
Tires & wheels
Buying & financing
Leasing
Towing
One number, worked out on this page
Chicago to Nashville (about 470 mi) and back in a 31-mpg crossover, two people splitting gas: 940 mi of driving costs $135.85 in gas at $4.48 a gallon — $67.92 a head. The trip calculator opens on exactly this case, and every other calculator opens on a case of its own.
Why the defaults look the way they do
Prices start from real US figures, not placeholders: regular gasoline averaged $4.48 a gallon in the EIA weekly survey for the week of September 21, 2026, and the average new-car loan rate was 6.35% APR in Experian’s report for the quarter ending June 30, 2026. The average new vehicle sold for $50,089, which is why the loan and lease calculators open on a price in that range. Change any of them — they are starting points, not assumptions baked into the math.
What every calculator here does differently
- It shows the catch: the check the usual calculator skips — the payload a trailer eats before its weight does, the APR hiding inside a money factor, the speed you are really doing on bigger tires.
- It keeps your numbers: the last inputs are stored in your browser only, with a visible link to forget them.
- It gives you a link that reopens your exact case, so you can send it to whoever is splitting the gas or co-signing the loan.