Formula guide

Amortization Calculator formula

An amortizing loan spreads repayment across equal monthly payments. Each payment covers both interest and principal, with more interest paid earlier in the term and more principal paid later.

How the input values are used

Loan amount (USD)

The numeric value in USD is used in the calculation; keep units consistent.

Annual interest rate (%)

The numeric value in % is used in the calculation; keep units consistent.

Loan term (years)

The numeric value in years is used in the calculation; keep units consistent.

How to interpret the result

  • The result uses Loan amount (USD) and Annual interest rate (%). Change one variable at a time to compare its effect on the outcome.
  • Check whether relevant fees, taxes, and timing assumptions are included before using the estimate.
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