Mortgage Payment Calculator
A mortgage payment is built from more than just the loan amount split evenly across the years — compound interest means you pay far more interest in the early years than in the later ones, even though the payment itself stays flat for the life of the loan. This calculator uses the standard amortization formula lenders use to compute a fixed monthly principal-and-interest payment, so you can see how home price, down payment, loan term, and interest rate interact before committing to a 15- or 30-year mortgage. Note that it covers principal and interest only — it does not include property taxes, homeowners insurance, PMI, or HOA dues, which lenders often bundle into a quoted monthly payment (commonly called PITI).
How the Payment Is Calculated
Your loan amount is simply the home price minus your down payment. That balance is then amortized — spread across equal monthly payments — using your interest rate and loan term, so that every payment is identical in size but the mix inside it changes over time. Early payments are weighted heavily toward interest because the outstanding balance is largest then; later payments flip toward principal as the balance shrinks. This is why paying even a little extra toward principal in the early years can meaningfully cut the total interest paid over the life of the loan.
Why a Bigger Down Payment Matters
Every dollar you put down reduces the loan amount that accrues interest, so a larger down payment lowers both your monthly payment and the total interest paid over the loan’s life. It can also help you cross the conventional-loan threshold of 20% down, which typically lets you avoid private mortgage insurance (PMI) — an added monthly cost this calculator does not include. Beyond the math, a bigger down payment also gives you more equity from day one, which matters if you need to sell or refinance not long after buying.
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A note on these calculators: Every tool in this Finance section is an original implementation built directly from standard, publicly known financial formulas — the same loan-amortization math used industry-wide for the mortgage and auto loan calculators, the standard compound-interest future-value-of-an-annuity formula (and its algebraic inverse) for the retirement and savings-goal tools, month-by-month interest-accrual simulation for the debt payoff and credit card payoff tools, the classical “Rule of 72” approximation alongside its precise logarithmic form, and straightforward arithmetic for the budget, net worth, and emergency fund tools. None of these were copied, scraped, or licensed from any specific third-party calculator, publication, or company, and Freedom Wealth Lab is not affiliated with or endorsed by any outside calculator provider. Every formula was independently checked against manual calculations before publishing.
