What you provide
What you provide
- Current mortgage balance: Outstanding principal.
- Annual interest rate: Nominal annual rate.
- Remaining term: Years left on the loan.
- Extra monthly payment: Additional principal and interest payment each month.
HOUSING / FINANCE PLANNING
Mortgage Interest Savings Calculator
Estimate interest saved when a fixed extra monthly payment is added to the scheduled payment.
- 01 Calculated in this tab
- 02 Values stay in this browser tab
- 03 Use boundary
Use boundary
Calculation path
Enter the values shown in the form. Nirmion evaluates the displayed formula in your browser and reports the result with supporting metrics.
Calculation path
Interest saved = baseline amortized interest - interest with the extra monthly payment.
What you receive
What you receive
- A primary estimate
- Supporting cost or ratio metrics
- The formula, assumptions, and limitations used
Use boundary
Choose the maximum decimal places shown. This does not increase source accuracy.
This is a planning estimate, not a lending approval, tax opinion, valuation, or financial recommendation. Confirm current lender terms, local rules, fees, and professional advice before acting.