Published: 21 October 2026 · Updated: 24 October 2026
Your true monthly home cost — principal, interest, property tax, homeowners insurance, PMI and HOA — plus total interest and your payoff date.
Your real mortgage payment = principal + interest + property tax + homeowners insurance (PITI) + PMI if you put less than 20% down + HOA dues. Example: a $400,000 home, 20% down, 30-year fixed at 7% costs about $2,654/month all-in — and roughly $446,600 in interest over the life of the loan. Enter your numbers below.
Researched by MixKhazana Team · Last updated 24 October 2026
The engine of every mortgage is the amortization formula: M = P × r(1+r)n ÷ ((1+r)n − 1), where P is the loan amount, r the monthly interest rate and n the number of payments. That gives you principal + interest — but a real payment is PITI: principal, interest, property tax and homeowners insurance, usually collected monthly into an escrow account. Put down less than 20% on a conventional loan and the lender adds PMI (private mortgage insurance, typically 0.5%–1.5% of the loan per year); condos and some neighborhoods add HOA dues on top.
What shocks most first-time buyers is the total interest: at 7% over 30 years, a $320,000 loan costs roughly $446,600 in interest — more than the home itself. That is why rate-shopping matters so much: even 0.25% on a 30-year loan moves tens of thousands of dollars. It is also why the 15-year term is worth modeling — the payment is much higher, but the interest saved is dramatic, and the rate is usually a touch lower.
A buyer purchases a $400,000 home with 20% down ($80,000), a 30-year fixed loan of $320,000 at 7% APR, 1.2% property tax and $1,500/year insurance:
Now change the down payment to 10% in the widget and watch PMI appear — that is the real cost of a small down payment, month after month, until you cross 20% equity.
The full payment is PITI plus extras: principal (paying down the loan), interest (the lender's charge), property tax (collected monthly and paid to your county), homeowners insurance, HOA dues if you have them, and PMI when your down payment is under 20%. The calculator above adds every piece so the monthly total matches what would really leave your account.
Private mortgage insurance protects the lender, not you, and is usually required on conventional loans when your down payment is under 20% of the home price. It typically costs 0.5% to 1.5% of the loan amount per year. By law (the Homeowners Protection Act), PMI on most conventional loans must drop off automatically once your balance reaches 78% of the original value — you can also request removal at 80%.
A 15-year loan has much higher monthly payments but far less total interest and usually a slightly lower rate; a 30-year loan keeps the payment affordable and flexible. Many buyers take 30 years and make extra principal payments when they can — you get most of the interest savings without the obligation of the higher payment.
The standard guideline is the 28/36 rule: keep your total housing payment (PITI plus HOA) at or below 28% of your gross monthly income, and all monthly debts including housing at or below 36%. Because this calculator includes taxes, insurance and HOA, the number it gives is the realistic one to compare against that 28%.
A great deal. Extra payments go straight to the principal, wiping out all the future interest that balance would have carried. An extra $100 to $200 a month can shorten a 30-year loan by 4 to 6 years and save tens of thousands in interest. Ask your servicer to apply extra payments to principal, not as advance payments.
Most lenders collect property tax and insurance with your monthly payment and hold the money in an escrow account, then pay the bills when they fall due. Because tax assessments and insurance premiums change yearly, your monthly payment changes too — even on a fixed-rate loan.
The interest rate is the cost of borrowing the loan amount itself. The APR bundles the rate together with certain lender fees and closing costs, so it is usually a little higher and is the better number for comparing loan offers side by side.
No. The principal-and-interest math is exact for the numbers you enter, but property tax rates, insurance premiums, HOA dues and PMI vary by location and lender, so treat the total as a planning estimate. Get written quotes from at least three lenders before making an offer.