Wheel Offset Calculator

Compare the outer position of a new wheel with your current wheel using wheel width and offset. A positive result means the new wheel extends farther outward; a negative result means it sits farther inward. Widths use nominal bead-seat measurements. Tire size, suspension clearance, brakes, and fender clearance are not included, so check fitment separately. Defaults are illustrative.

Speedometer Correction Calculator

Estimate actual speed after changing tire size using the ratio of new to original tire diameter. Enter the tire diameters and the speed shown on the speedometer. This assumes the speedometer was accurate with the original tires and both tires have the same effective rolling characteristics.

Tire Sidewall Height Calculator

Calculate the nominal height of one tire sidewall from the tire’s section width and aspect ratio. For example, a 225/65 tire has a 225 mm section width and a 65% aspect ratio. Actual dimensions can vary by tire and manufacturer.

Tire Diameter Calculator

Estimate the overall diameter of a tire from its nominal metric tire size. The calculation assumes the tire is unloaded and uses the stated section width and aspect ratio; actual diameter can vary by manufacturer, rim width, wear, and inflation.

Tire Size Calculator

Compare the overall diameter of two metric tire sizes and estimate the percentage change. Enter the width, aspect ratio, and wheel diameter printed on each tire. The calculation assumes unloaded nominal dimensions; actual tire dimensions and vehicle fitment may vary.

Road Trip Fuel Calculator

Estimate fuel cost for a road trip using the total driving distance, your vehicle’s expected fuel economy, and an assumed fuel price. Include both outbound and return distances if applicable. Actual fuel use varies with traffic, terrain, weather, and driving habits.

Cost Per Mile Calculator

Estimate your SUV’s cost per mile using fuel economy, fuel price, maintenance costs, and annual vehicle expenses. Defaults are illustrative. Include expenses such as insurance, registration, and depreciation in the annual cost fields as appropriate; the estimate excludes any costs you leave out.

Fuel Economy Calculator

Calculate average fuel economy from the miles driven and gallons of fuel used. For a practical estimate, fill the tank, record the distance driven, then refill it and enter the gallons added. Results vary with driving conditions and refueling accuracy.

Fuel Cost Calculator

Estimate the fuel cost of a trip using distance in miles, vehicle fuel economy in US miles per gallon, and fuel price per US gallon. Defaults are illustrative; actual fuel economy and prices can vary.

Car Total Cost of Ownership Calculator

Estimate the total cost of owning a car over your chosen period. Enter your purchase price, expected resale value, annual mileage, fuel cost per mile, and estimated annual running costs. Annual running costs can include insurance, maintenance, repairs, registration, and taxes. Defaults are illustrative. Financing costs and inflation are excluded; include financing charges in annual running costs if applicable. A resale value above the purchase price reduces the estimated total.

Car Affordability Calculator

Estimate an affordable vehicle price from a monthly income-based budget, other monthly car costs, down payment, loan interest rate, and term. Defaults are illustrative. The estimate assumes equal end-of-month payments, a fixed nominal annual interest rate compounded monthly, and no loan fees or taxes; reserve money for those separately. A longer term can reduce payments but increase total interest.

Car Lease Calculator

Estimate a monthly car lease payment using the negotiated vehicle price, down payment, residual value, lease term, money factor, and assumed tax rate. Defaults are illustrative. Enter a residual value no greater than the price after the down payment.

Car Refinance Calculator

Estimate the monthly principal and interest payment on a refinanced car loan. Enter your current payoff balance, fees added to the new loan, annual interest rate, and new repayment term. This fixed-rate estimate assumes monthly compounding and equal end-of-month payments. It excludes fees paid upfront and other costs; the interest rate is not the same as APR. Compare total loan costs as well as monthly payments, since a longer term can increase total interest. Defaults are illustrative.