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These 21 calculators cover the full lifecycle of owning a car: figuring out what you can afford before you buy, comparing financing options, tracking what it actually costs to keep driving, and estimating what your car is worth when it's time to sell, trade in, or refinance. Each tool includes a plain-language explanation of the math behind it, so you're not just getting a number — you understand what's driving it and how to use it in a real decision.
Figure out your budget before you shop, then model the loan itself — payment size, down payment tradeoffs, refinancing, early payoff, and the extra risks that come with negative equity or a loan that's underwater.
Your payment as a share of gross and take-home, how a lender reads it, and how far approval runs past what you can afford.
FinancingCalculate your car loan monthly payment, total interest paid, and full loan cost.
FinancingCompare paying cash outright vs financing and investing the difference — see which actually saves more.
FinancingFind out exactly how much car you can afford based on your income and the 20/4/10 rule.
Buying & FinancingSix competing rules of thumb applied to your salary side by side — they disagree by nearly 8x.
FinancingSee how different down payment amounts affect your monthly payment and total interest.
FinancingCompare the total cost of leasing vs buying a car over any term.
Buying & FinancingProject your overage charge, the daily budget that avoids it, and whether buying out the lease beats paying it.
FinancingSee how much you could save by refinancing — monthly savings, total interest saved, and break-even point.
FinancingEstimate the OBBBA deduction across the full 2025–2028 window, with the income phase-out applied year by year.
FinancingSee how much faster you can pay off your car loan with extra payments.
FinancingFind out if you need GAP insurance by comparing your loan balance to your car's value.
FinancingCalculate car sales tax for any US state instantly, including trade-in deductions.
FinancingEstimate your car insurance cost based on your age, driving record, and coverage level.
FinancingSee exactly how much extra interest and payment you take on by rolling negative equity into a new loan.
FinancingSee how much interest and time you save by switching to bi-weekly car payments.
FinancingCompare a 0% financing offer against taking the rebate and financing at your own rate.
Buying & FinancingPut your pre-approved rate next to the dealer quote — see the markup and what it costs over the term.
FinancingSee how much a cosigner could lower your monthly payment and total interest.
FinancingCheck your VIN's country of assembly and estimate the 2026 tariff impact on your price and payment.
FinancingCompare the true monthly and total cost of a subscription, lease, and buying — insurance and maintenance included.
FinancingCompare the total cost of taking over someone else's lease against starting a new lease for the same term.
The ongoing costs that don't show up on the sticker price — fuel, maintenance, and the full 5-year picture of what a car actually costs to keep on the road.
What a fill costs from wherever the needle is now — tank size by vehicle class, grade pricing, and the range it buys.
Running CostsCalculate how much you'll spend on gas for a road trip or over a full year.
Running CostsCalculate your car's real-world MPG from miles driven and gallons used.
Running CostsCalculate the total cost of a road trip including gas, food, lodging, and activities.
Running CostsEstimate how much you'll spend on car maintenance per year based on make, age, and mileage.
Running CostsCalculate the true 5-year cost of owning a car: purchase, interest, insurance, fuel, maintenance, and depreciation.
Track what a car is worth over time, whether you're checking depreciation on your current vehicle, pricing out a used car, or estimating a trade-in before you negotiate.
Calculate your car's value in 1, 3, or 5 years and see exactly how much it loses per year.
OwnershipEstimate the fair market value of a used car based on age, mileage, condition, and original price.
OwnershipEstimate your car's trade-in value before visiting a dealership.
Compare EV charging costs against gas, and see whether switching from a gas car to an electric vehicle actually pencils out for your driving habits and local electricity rates.
Buying a car for Uber, Lyft, DoorDash, or Instacart is a different decision than buying one for yourself — this tool compares buy vs rent vs lease on real cost per mile, not just monthly payment.