An interest rate calculator works out the rate charged or earned from principal, amount, and time, or the reverse — the amount you will pay given a known rate.
An interest rate calculator works out the rate charged or earned from principal, amount, and time, or the reverse — the amount you will pay given a known rate. Our interest rate calculator is built on the same core calculate interest rate interest calculator annual interest rate calculator and is trusted by students, professionals and everyday users who need a fast, accurate result. Because every calculation runs locally in your browser, there is no waiting, no sign-up and no limit on how often you use it.
Nominal vs. Effective Annual Rate (EAR)
EAR accounts for intra-year compounding frequency: EAR = (1 + r/n)ⁿ − 1, reflecting the true annualized interest paid or earned.
Calculating Implied APR on Loans
Solve for the exact underlying interest rate given a known loan amount, installment payment, and loan duration.
Comparing Borrowing Costs Across Lenders
Use effective APR to accurately compare credit cards, personal loans, and financing terms with differing compounding structures.
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