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Loan / Mortgage Calculator

Math

Compute monthly payment, total interest, and a full amortization schedule from principal, rate, and term

Enter a principal, annual interest rate, and term and get the fixed monthly payment back immediately, using the same amortizing-loan formula lenders use for mortgages, auto loans, and personal loans. Beyond the headline payment number, it breaks out total interest paid over the life of the loan and a full month-by-month schedule showing how much of each payment goes to principal versus interest, which shifts steadily toward principal as the balance shrinks. A 0% interest rate is handled as a straight-line split rather than dividing by zero, useful for interest-free installment plans. Everything is computed from the standard formula with no live rate feed, no jurisdiction-specific tax or fee logic, and no data sent anywhere.

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How to use Loan / Mortgage Calculator

  • 1.Enter the loan principal, annual interest rate, and term (years and/or months) to get the fixed monthly payment.
  • 2.Check total interest and total paid over the life of the loan to compare different rate or term scenarios.
  • 3.Expand the amortization schedule to see exactly how much of each monthly payment goes to principal versus interest.

Frequently asked questions

Does this account for taxes, insurance, or lender fees?
No. It computes the standard amortizing-loan payment from principal, rate, and term only, the same core math a mortgage calculator uses before taxes, PMI, or escrow are layered on top.
Why does the last payment in the schedule sometimes differ by a few cents?
Rounding each month's payment to the cent can leave a small residual balance, so the final payment is adjusted to bring the balance to exactly zero, matching how real amortization schedules are built.
Can I use this for a 0% interest loan?
Yes, a 0% rate is handled as a straight-line split of principal across the term instead of running the compound-interest formula, so it won't divide by zero or error out.
Is my loan data sent anywhere?
No, the calculation runs entirely in your browser. Nothing is transmitted to a server or stored.

Use via API, SDK, or MCP

cURL# Free: 1,000 req/day · Pro: 10,000 req/day
curl -X POST https://api.utilix.tech/v1/tools/loan-calculator \
  -H "Authorization: Bearer utx_live_..." \
  -H "Content-Type: application/json" \
  -d '{"principal":200000,"annualRatePercent":6,"termMonths":360}'

Get an API key from your dashboard · Full API docs →

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