About

MortgageCalculatorsAndRates.com exists to answer one question clearly: where does your mortgage payment actually go? Most calculators online bury that answer behind a signup form, an email capture, or a "connect with a lender" popup. This one doesn't. Type in your numbers, get your answer, done.

Principal vs. interest, color-coded

Every payment you make is split between two very different things: money that builds your equity, and money that pays for the privilege of borrowing. We color-code the two everywhere on this site — green for principal, which is yours, and amber for interest, which is the cost. Once you can see that split at a glance, amortization schedules stop being a wall of numbers and start being a story about your loan.

Everything runs in your browser

Every calculator on this site does its math client-side, in JavaScript, on your device. Your loan amount, rate, income, or any other number you type in is never sent to a server, logged, or stored anywhere — because there's nowhere for it to go. Close the tab and it's gone. There's no account to create and nothing to opt out of later.

Accuracy

The math engine behind these calculators is covered by an automated test suite that checks its output against known reference values, so amortization schedules, interest totals, and payoff dates stay correct as the site evolves. That said, this is a solo-maintained project, not a bank or a financial institution, and mortgages have real edge cases (odd first-payment dates, escrow quirks, lender-specific rounding). If a number here doesn't match what your lender shows you, I'd genuinely like to know about it — please get in touch through the contact page with details, and I'll look into it.

Who's behind this

This site is built and maintained by a single web developer, not a company or a "team of financial experts." It's a side project born out of wanting a mortgage calculator that respects your time and your data. Calculators are added one at a time, tested, and shipped — there's no roadmap promising the world, just steady progress.