What is a mortgage calculator?
A mortgage calculator is a planning tool that estimates your monthly home loan payment based on the loan amount, interest rate, and repayment term. It applies the standard amortization formula used by banks and mortgage lenders worldwide, then breaks the result into the portion going to interest versus the portion paying down your principal each month. Beyond the headline payment, a good calculator shows the total interest you'll pay over the life of the loan and the full amortization schedule. This helps you compare different loan offers, decide between a 15- and 30-year term, or see how a larger down payment changes the math before you commit.