Tools in Auto

Calculators for your car: monthly loan payment, fuel cost per trip and tire size equivalents.

Car payment calculatorEstimate your monthly car payment with a down payment and trade-in. See the loan amount, total interest and the exact formula with worked examples.
Fuel Cost CalculatorEstimate the liters of gas your road trip needs and the total cost in dollars, with an easy split per person and a quick mpg conversion guide.
Tire size calculatorCompare any two tire sizes, like 205/55R16 vs 225/45R17: overall diameter, percent difference and speedometer error, with the 3% safe-swap rule explained.