Quick guide
How to use this calculator
- Enter every amount in one consistent currency.
- Use the nominal annual rate and whole-number monthly timing requested by each label.
- Read the result together with the stated timing convention and calculator-specific exclusions.
Calculation method
Calculation method
Each month charges opening balance × nominal annual rate ÷ 12, then applies the level payment to interest and principal.
Entered monetary components are aggregated as exact fixed decimals. Amortization keeps full calculation precision and rounds only for presentation; a nonzero supported result is never displayed as zero.
Worked example
Worked example
For a 12,000 zero-rate loan repaid over 12 months, the balance after payment 5 is 7,000.
Each month charges opening balance × nominal annual rate ÷ 12, then applies the level payment to interest and principal.
Supported inputs
Precision and limits
Visible input limits
Amounts are capped at 1e12, nominal annual rates at 1000%, schedules at 1,200 months, and fixed-decimal inputs at 12 decimal places.
Estimate, not an offer
Results model only the entered values. A lender or contract may use different payment dates, day counts, compounding, fee treatment, statement rounding, or allocation rules.
International scope
No currency, country, tax, credit-scoring system, consumer-credit law, or lender policy is assumed. Location-dependent amounts must be entered explicitly.
Calculator-specific assumptions
The balance is reported after the selected end-of-month payment. The estimate assumes all earlier payments were made as scheduled with no extras or missed payments.