How to Use the Loan Grace Period Interest Calculator
A grace period lets you pay only interest for a set stretch of the loan before principal payments begin. It's often used to lower payments right after closing, but many borrowers don't realize how much higher payments jump once the grace period ends. Enter your loan amount, rate, grace period, and repayment term to see both phases side by side.
During the grace period, you pay loan amount × annual rate ÷ 12 every month. Since none of that goes toward principal, it's essentially extra cost with nothing to show for it — and the longer the grace period, the more total interest accrues during that phase alone.
Once the grace period ends, the full principal must be repaid over the remaining term using equal-payment amortization. Because none of the balance was paid down during the grace period, both the monthly payment and total interest end up higher than if you had started amortizing from day one. A grace period can ease short-term cash flow, but it raises the long-term cost of the loan.
Frequently Asked Questions
A grace (interest-only) period is a stretch of the loan where you pay only interest and no principal. Monthly payments are lower during this time, but since the balance never drops, you must repay the full principal over the remaining term afterward — raising later payments.
It lowers your payments in the short term, but every dollar of interest paid during the grace period does nothing to reduce the balance — it's pure extra cost. A longer grace period increases both total interest and the payment jump once amortization begins.