What it does
What This Mortgage Calculator Does
This mortgage calculator estimates the monthly cost of a home loan using the home price, down payment, interest rate, loan term, property tax, homeowners insurance, and optional HOA dues. The result separates principal and interest from other housing costs, which matters because many mortgage estimates show only the loan payment even though homeowners often budget for escrow items too.
Use the estimate before comparing homes, talking with a lender, or deciding whether a higher down payment is worth it. It is a planning number, not a formal Loan Estimate.
How to use it
How to Use the Mortgage Calculator
Start with the home price and down payment. The calculator subtracts the down payment from the price to estimate the loan amount. Next, enter the annual interest rate and loan term. A 30-year term usually lowers the monthly payment, while a 15-year term usually increases the payment but can reduce lifetime interest.
Then add annual property tax, annual homeowners insurance, and monthly HOA dues if they apply. Change one input at a time so you can see whether rate, down payment, term, or home price moves the payment most.
Formula
How Mortgage Payments Work
The principal and interest part of a fixed-rate mortgage uses the standard amortization formula: monthly payment equals P times r times (1 + r)^n, divided by (1 + r)^n minus 1. In that formula, P is the loan amount, r is the monthly interest rate, and n is the total number of monthly payments. The monthly rate is the annual rate divided by 12.
After calculating principal and interest, this tool adds property tax divided by 12, homeowners insurance divided by 12, and monthly HOA dues. PMI, closing costs, points, utilities, and maintenance are not included.
Example calculation
Example Home Payment Scenario
Suppose a home costs $350,000 and the buyer puts $70,000 down. The estimated loan amount is $280,000. With a 6.75% annual interest rate and a 30-year term, the principal and interest payment is about $1,816 per month. If annual property tax is $4,200, that adds about $350 per month. If annual homeowners insurance is $1,400, that adds about $117 per month.
With no HOA dues entered, the estimated monthly payment is about $2,283. Testing a lower rate, larger down payment, or 15-year term makes the tradeoff visible before you commit to a home price or loan structure.
Benefits
Benefits of Estimating the Full Payment
A full payment estimate can help you compare homes in different tax areas, understand why two homes at the same price may not cost the same each month, and avoid focusing only on the interest rate.
The best use of this calculator is comparison. Run one scenario, then adjust the rate, term, or down payment before combining changes.
Common mistakes
Common Mortgage Calculator Mistakes
The most common mistake is stopping at principal and interest. Taxes, insurance, mortgage insurance, HOA dues, and local fees can change affordability. Also remember that taxes and insurance can rise over time, so the estimate is a starting point, not a fixed promise.
FAQ
Mortgage Calculator FAQs
Does this include PMI? No. If your down payment is below 20%, private mortgage insurance may apply.
Why add taxes and insurance? Many homeowners pay these monthly through escrow, so including them gives a more realistic estimate.
What numbers should I enter first? Start with home price, down payment, interest rate, and term. Add tax, insurance, and HOA estimates after that.
Can I compare a 15-year and 30-year mortgage? Yes. Change the loan term to compare monthly payment and total interest. A shorter term usually raises the payment but can reduce interest.