The "principal & interest" figure this calculator leads with is only part of most homeowners' actual monthly bill. Lenders commonly bundle in property tax and homeowners insurance too (often called an "escrow" payment), and if your down payment is under 20%, you'll typically also pay PMI (private mortgage insurance) until you've built enough equity in the home. Toggle "include property tax, insurance & PMI" above to see a more complete estimate.
The loan term matters more than most people expect. A 30-year loan has lower monthly payments than a 15-year loan for the same amount, but you'll pay significantly more in total interest over the life of the loan — often close to double — because interest is charged on the outstanding balance for twice as long.
A fixed-rate mortgage uses a repayment structure called amortization, where your monthly payment stays the same throughout the loan, but the mix between principal and interest shifts dramatically over time. In the first few years, the vast majority of each payment goes toward interest, with only a small sliver reducing the actual loan balance. As the balance slowly shrinks, less interest accrues each month, so more of each fixed payment goes toward principal — the split flips increasingly in your favor as the loan matures.
This is exactly why paying off a mortgage early (through extra principal payments) is most impactful in the early years of the loan — every extra dollar of principal paid early avoids years of future interest that would otherwise accrue on that portion of the balance.
This calculator assumes a fixed interest rate for the full loan term, which is the most common and predictable mortgage type — your rate and payment never change. An adjustable-rate mortgage (ARM) typically starts with a lower introductory rate for a set period (commonly 5, 7, or 10 years), then adjusts periodically based on market interest rates, which can mean payments rise (or fall) significantly afterward. ARMs can make sense for buyers who plan to sell or refinance before the adjustable period begins, but they carry genuine payment uncertainty afterward that a fixed-rate loan doesn't.
A commonly cited guideline (not a hard rule, and lenders vary) is that total housing costs — mortgage payment, property tax, insurance, and any HOA fees — shouldn't exceed roughly 28% of gross monthly income, and total debt payments (including car loans, student loans, and credit cards) shouldn't exceed about 36%. These are starting reference points for your own budgeting, not guarantees of loan approval — actual lending decisions depend heavily on credit score, debt history, down payment size, and the specific lender's own criteria.
This tool provides estimates for planning purposes only. It isn't financial advice, and actual loan terms, rates, and fees depend on your lender, credit profile, and location. Speak with a mortgage professional before making a purchasing decision.
PMI (private mortgage insurance) protects the lender, not you, and is typically required when your down payment is below 20% of the home's value. It's usually removable once you've paid the loan down to 80% of the home's original value, either automatically or by request, depending on the loan type.
It's a genuine tradeoff, not a clear right answer: 15-year loans mean higher monthly payments but far less total interest paid and faster equity building; 30-year loans mean lower monthly payments and more financial flexibility, at the cost of more interest over time. This calculator lets you compare both by changing the loan term chip.
Because interest compounds over a long loan term, even a 0.5% rate difference can add up to tens of thousands of dollars over 30 years. Try adjusting the interest rate field slightly to see the effect on total interest paid.
No — it calculates a standard fixed monthly payment schedule. Making extra principal payments or switching to biweekly payments can meaningfully reduce total interest and shorten your payoff timeline, but that calculation isn't included here.
This is normal and expected with standard amortization — interest is calculated on the remaining balance each month, so early on, when the balance is largest, most of the payment covers interest. As the balance shrinks over the years, more of each fixed payment goes toward principal instead.
A fixed-rate mortgage keeps the same interest rate and payment for the entire loan term. An adjustable-rate mortgage (ARM) starts with a lower rate for a set period, then adjusts based on market rates afterward — potentially raising or lowering payments significantly. This calculator assumes a fixed rate throughout.