Mortgage Calculator

Mortgage Calculator is a free, browser-based tool built for one job: calculate home loan payments with taxes, insurance & amortization. It is part of ToolsMonk's calculators collection, so you can finish the work without downloading software, creating an account, or jumping between multiple websites.

People reach for it most often when they need estimating the monthly payment on a home loan before applying, comparing a 15-year vs 30-year mortgage, and seeing how a larger down payment or lower rate changes the payment. With nothing to install, an unexpected one-off job takes no longer to start than your regular routine.

The design goal is simple: practical output on the first try, with a privacy-friendly workflow and the rest of the ToolsMonk library one click away.

Mortgage Calculator estimates the monthly payment on a home loan from the loan amount, interest rate, and term, and shows the total interest and total cost so you understand the full long-term picture, not just the monthly figure.

It uses the standard amortising formula, producing a fixed principal-and-interest payment where early payments lean heavily toward interest and later ones toward principal. Comparing terms is illuminating: a 30-year loan lowers the monthly payment and improves affordability, but because you pay interest far longer (often at a slightly higher rate), the total cost can be dramatically higher than a 15-year.

Crucially, the calculated payment is principal and interest only. Your real monthly housing cost also includes property taxes, homeowners insurance, and possibly PMI or HOA fees, which can add up significantly, so budget for those on top. A larger down payment, meanwhile, lowers both the payment and total interest and can eliminate PMI.

Everything runs in your browser, so your figures stay private. Pair it with the Loan, EMI, and other ToolsMonk finance calculators to plan the full cost of a major purchase.