🚗 Automotive Calculators
Buy and run your car smarter. See how much car you can really afford with the 20/4/10 rule, compare lease vs buy, and estimate fuel, loan, and maintenance costs before you sign anything.
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Car Affordability Calculator (20/4/10 Rule)
The most car you can afford without stretching your budget.
🚗Auto Loan Calculator
Monthly car payment and total interest from price, down payment, APR and term.
🔑Lease vs Buy Car Calculator
Compare the true 3-year cost of leasing vs buying a car, including equity.
🧮Total Cost of Car Ownership Estimator
Estimate the true 5-year cost of owning a car: loan, insurance, fuel, repairs, and cost per mile.
More on the way: we're building 34 automotive calculators. New tools go live every week.
Frequently asked questions
What is the 20/4/10 rule?
Put at least 20% down, finance for no more than 4 years, and keep total monthly car expenses under 10% of your gross monthly income.
Does the calculator include insurance and fuel?
Yes — the 10% budget covers the loan payment plus insurance and fuel, so the price it gives you is realistic.