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About Loan Payment Calculator Online

This tool calculates the monthly payment, total interest, and full amortization schedule for any fixed-rate loan. Enter the loan amount, annual interest rate, and term in years or months, and it computes how much you'll pay each month and how the balance is paid down over time.

It works for any kind of installment loan: auto loans, personal loans, student loans, small business loans, and most fixed-rate mortgages. The amortization schedule reveals exactly how much of each payment goes toward interest versus principal — useful for comparing loan offers, deciding whether to make extra payments, and understanding the true cost of borrowing.

Run multiple scenarios side by side to compare different terms, rates, or loan amounts before committing to a lender.

How to use this tool

How to compute a fixed monthly loan payment

  1. Enter loan principal

    "Loan principal" is the amount borrowed (before any fees). Use the currency you'll pay in — the tool returns a number, not a currency-formatted string.

  2. Annual interest %

    "Annual interest %" is the nominal annual rate (e.g. 6.5 for a 6.5% APR). The tool divides by 12 internally for the monthly rate; APR vs. APY differences are not modelled.

  3. Term in months

    "Term (months)" is the number of equal monthly payments — 360 for a 30-year mortgage, 60 for a 5-year auto loan.

  4. Press Run

    Result is monthlyPayment using the standard amortisation formula `P × r(1+r)^n / ((1+r)^n − 1)`. If you enter rate 0 it falls back to principal/months. Multiply monthlyPayment × months to see total interest paid.