Car calculators that show their work

Every calculator here shows the formula it uses and a worked example with real numbers, so you can check the math yourself — or hand it to a dealer. No account needed. Assumptions are yours to edit, not ours to hide.

Buy

• Car Loan Calculator — monthly payment, total interest, and payoff from the real amount financed, tax and fees included.
• Out-the-Door Price Calculator — coming next
• How Much Car Can I Afford — coming
• Dealer Add-On Cost Calculator — coming
• Car Loan Payoff Calculator — coming
• Car Refinance Calculator — coming
• Pay Cash vs Finance Calculator — coming

Lease

• Money Factor Calculator — coming
• Adjusted Cap Cost Calculator — coming
• Car Lease Calculator — coming
• Implied Money Factor Calculator — coming
• Lease Mileage Calculator — coming
• Lease vs Buy Calculator — coming
• Lease Buyout Calculator — coming

Decide

• Repair or Replace Calculator — coming