Financial calculators that show you the whole picture
Payoff Logic builds free, no-signup calculators for the money decisions that matter most — your mortgage, your loans, and your debt payoff plan. Every tool includes the full math: amortization schedules, taxes and insurance, and shareable, printable results.
- 100% free, no account needed
- Nothing you enter leaves your browser
- Full amortization tables included
All calculators
All five launch tools are live — each built to show the complete math, verified against published reference examples.
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Mortgage Calculator
Estimate your full monthly payment — principal, interest, property taxes, insurance, PMI, and HOA — with a complete amortization schedule.
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Loan Payoff Calculator
See how extra payments shorten your loan and how much interest you save.
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Debt Snowball Calculator
Compare the snowball and avalanche payoff methods side by side across all your debts.
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Refinance Calculator
Find your break-even month and lifetime savings before you refinance.
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Auto Loan Calculator
Estimate car payments including trade-in value and state sales tax.
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Why another calculator site?
Complete math, not teasers
Most calculators stop at a single monthly number. Ours break down principal, interest, taxes, insurance, PMI, and HOA — and show the full payoff schedule.
Private by design
Calculations run entirely in your browser. We never see, store, or sell the numbers you enter.
Sourced & transparent
Where we use reference data — like state property-tax rates — we cite the source so you can verify it yourself.
Educational purposes only — not financial advice. See our Terms of Use.