Automotive Calculators

Vehicle costs show up in more places than the sticker price — fuel economy over time, financing terms, tire sizing when you're shopping for replacements, and the lease-vs-buy tradeoff all have real, calculable answers rather than rules of thumb. This category brings together the calculators for the recurring automotive questions: what a road trip or commute will cost in fuel, what a loan or lease actually costs over its term, and technical conversions like tire size and engine horsepower.

For a financing decision (buy vs. lease, loan length, cash-back vs. low-interest offers), use the finance-style calculators in this category, which mirror the ones in Financial Calculators but tuned for vehicle-specific inputs. For a trip or ownership-cost question, use fuel cost, gas mileage, or mileage calculators. For a technical spec question when shopping for parts, use tire size or engine horsepower calculators.

• Comparing a lease payment directly to a loan payment without accounting for what you own at the end — a lease payment is usually lower because you're not building equity in the vehicle.
• Ignoring mileage limits and end-of-lease fees when running lease numbers — these can turn an apparently cheaper lease into a more expensive one.
• Changing tire size without checking the effect on speedometer accuracy and overall gearing — a significantly different diameter changes both.