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Free Loan Payment Calculator - Use Online Without Installing

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Estimate monthly loan payments and total interest

How to use this tool

  1. Enter principal in U.S. dollars, annual rate, and months.
  2. Choose fixed monthly payment or equal principal.
  3. Compare the first payment, final payment, and total interest.

Real-world uses

  • Compare 36- and 60-month repayment terms.
  • See whether lower overall interest justifies higher early payments.

What to check

  • Assumes a fixed annual rate divided into monthly periods.
  • Excludes fees, mortgage insurance, property tax, and rate changes.

Common problems and fixes

My lender quote differs
Check compounding, first due date, rounding, fees, and whether the loan has a variable rate.

File and input privacy

Principal and rate inputs are calculated in the browser and are not stored on ToolMarket servers.

Calculation basis and sources

Fixed-rate monthly principal-and-interest formula ยท Reviewed 2026-09-14

Questions about this tool

Does monthly payment include taxes and insurance?

No. It estimates principal and interest only.

Practical guides