Mortgage Early Repayment Calculator

Base payment must exceed first-month interest. Fixed rate, no new borrowing or fees. Final payment may be smaller than the regular payment.

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Result

Enter your values and run the tool to see your result.

Check the units, enter your values, and run the tool. Results follow the assumptions and method below.

Theoretical months without extrarate == 0 ? balance/payment : -log(1-balance*(rate/1200)/payment)/log(1+rate/1200)

Theoretical months with extrarate == 0 ? balance/(payment+extra) : -log(1-balance*(rate/1200)/(payment+extra))/log(1+rate/1200)

Number of payments with extraceil((rate == 0) ? balance/(payment+extra) : -log(1-balance*(rate/1200)/(payment+extra))/log(1+rate/1200))