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.
Mortgage
Explore by state (all 50, local tax & insurance preloaded) or by loan amount ($100k–$2M payment tables).
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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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Home Affordability Calculator
How much house can you afford? Income, debts, and the 28/36 rule turned into a real price range.
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Extra Payment Mortgage Calculator
What paying more each month (or one lump sum) does to your mortgage payoff date and interest.
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Biweekly Mortgage Calculator
Half your payment every two weeks equals 13 payments a year — see the years and interest it removes.
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15-Year Mortgage Calculator
15 vs. 30 years side by side: payment difference, interest difference, and equity build.
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FHA Loan Calculator
FHA payment with both MIP charges included — upfront 1.75% and the annual premium, with the 11-year rule.
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VA Loan Calculator
VA payment with the correct funding fee for your down payment and usage — and no PMI.
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Mortgage Payoff Calculator
Pay off your existing mortgage early: extra monthly payments, lump sums, and your new payoff date.
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Down Payment Calculator
Every tier from 3.5% to 20% compared: cash needed, payment, PMI — and what your savings cover.
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PMI Calculator
Your monthly PMI, the exact month it cancels at 78% LTV, and how extra payments remove it sooner.
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Mortgage Points Calculator
Price the rate buy-down: points cost, monthly savings, break-even month, lifetime value.
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Rent vs. Buy Calculator
Year-by-year net cost of each path — equity, appreciation, and transaction costs included — with your crossover year.
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Debt Payoff
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Loan Payoff Calculator
See how extra payments shorten your loan and how much interest you save.
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Credit Card Payoff Calculator
How long your payment takes — or the payment that hits your target date — with a +$50/+$100 ladder.
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Debt Consolidation Calculator
Your debts vs. a real loan offer at the same monthly budget — fees counted, longer-term tricks exposed.
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Personal Loan Calculator
Payment, total interest, and full schedule for any personal loan — plus early-payoff savings.
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Student Loan Payoff Calculator
Fixed-plan student loan math with extra-payment savings — and when NOT to prepay (IDR/forgiveness).
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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
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Refinance Calculator
Find your break-even month and lifetime savings before you refinance.
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Cash-Out Refinance Calculator
What the cash really costs per dollar borrowed — plus the 80% LTV check and your new payment.
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Auto
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Auto Loan Calculator
Estimate car payments including trade-in value and state sales tax.
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Car Affordability Calculator
Turn a monthly budget into a maximum sticker price — tax-aware, with down payment and trade-in.
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Auto Refinance Calculator
Check the refi math on your car loan in 30 seconds — fees included, longer-term trap flagged.
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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.