Mortgage Calculator (US)

The Mortgage Calculator is designed for home buyers and homeowners who need a reliable estimate of their monthly housing payment before committing to one of the largest financial decisions of their lives. Enter the home price, your down payment amount or percentage, the mortgage interest rate, and the loan term — typically 15 or 30 years. The tool computes your principal-and-interest payment and optionally factors in property taxes, homeowner's insurance, and private mortgage insurance (PMI) if your down payment is below twenty percent. The result is a realistic total monthly obligation, not just the loan payment in isolation. A detailed amortization table breaks every month into principal paid, interest charged, and remaining balance, so you can trace exactly when you cross the halfway mark on equity or when PMI drops off. Adjusting any input instantly recalculates the entire schedule, making it easy to compare a fifteen-year term against a thirty-year term, evaluate the effect of a larger down payment, or see how a quarter-point rate difference compounds over decades. The calculator follows the standard fixed-rate amortization formula and is suitable for conventional, FHA-style, and similar fixed-rate mortgage structures. It is especially valuable for first-time buyers running affordability checks, current homeowners considering refinancing, and real estate professionals providing quick estimates to clients. All math executes inside your browser — the home price, rate, and payment details you enter are never transmitted or stored on any server. There are no sign-up requirements, no ads, and no daily limits. Use it repeatedly to fine-tune your budget and walk into a lender meeting knowing exactly what to expect.

1. Enter the home price and your down payment (or its percentage).
2. Set the loan term in years and the annual interest rate.
3. Add property tax, homeowners insurance, and any HOA dues to see the full monthly cost.
4. Review your PITI payment; PMI is added automatically when your down payment is under 20%.

The advertised principal-and-interest payment rarely reflects what you'll actually pay. This calculator adds taxes, insurance, HOA, and PMI so you see the true monthly cost of a home before you commit.

• Full PITI breakdown: principal, interest, taxes, and insurance.
• Automatic PMI estimate when the down payment falls below 20%.
• Optional HOA dues folded into the monthly total.
• Instant recalculation as you adjust price, rate, or term.
• Client-side only — your financial details never leave the browser.

Monthly principal and interest use M = P · [r(1 + r)^n] / [(1 + r)^n − 1], where P is the loan amount, r is the annual rate divided by 12, and n is the term in months. Property tax, homeowners insurance, HOA dues, and PMI are then added on top to give the total PITI payment. PMI applies only while the down payment (and later, equity) is below 20%.