About this calculator

MortgageRecast.calc is a single-purpose tool: it estimates your new monthly payment after a lender recasts (re-amortizes) your mortgage following a lump-sum principal payment. No login, no email capture, no ads on the calculator itself getting in your way of the numbers.

The math follows the standard fixed-rate amortization formula lenders use — the same calculation your servicer runs, minus the wait on hold. Enter your current balance, rate, remaining term, and lump-sum amount, and you'll see your new payment, total interest saved, and how many months it takes the lower payment to recoup a typical recast fee.

This is an independent estimation tool, not affiliated with any lender or loan servicer. Always confirm exact figures — including your lender's specific recast fee and eligibility rules — with your loan servicer before making a lump-sum payment.

Built and maintained by Aspovo.