Mortgage Calculator
Estimate principal, interest, taxes, insurance, and amortization with the WealthCalcLab United States mortgage calculator.
Updated April 5, 2026
What this calculator does
This mortgage calculator helps you move beyond the headline monthly payment and evaluate the real cost of owning a property. It combines principal and interest with optional property tax, home insurance, HOA charges, and closing costs so you can plan with more realism.
Housing costs are not just the loan payment. Taxes, insurance, and recurring property costs matter for budgeting, underwriting, and long-term cash flow.
United States property buyers can use the calculator to compare down payment strategies, test the effect of extra principal payments, and understand how amortization changes over time.
How to use it
Enter the home price, down payment percentage, mortgage rate, and term first.
Use Advanced options to add property tax, home insurance, HOA fees, closing costs, and extra monthly principal.
Start with the monthly housing cost card for affordability, then use the amortization table for deeper planning.
Formula
Loan amount = Home price × (1 - down payment %)Mortgage payment = P × r ÷ (1 - (1 + r)^-n)The calculator first derives the loan amount from the home price and down payment.
Principal and interest are then calculated using the standard fixed-rate amortization formula.
Methodology
The mortgage portion is modeled as a standard fixed-rate amortizing loan with monthly payments.
Taxes, insurance, and HOA charges are added as cash-flow items and do not change the mortgage amortization schedule itself.
Actual United States mortgage offers may differ because of mortgage insurance, local transfer taxes, fees, escrow rules, or lender-specific underwriting adjustments.
Worked example
If a buyer puts 20% down on a 450,000 home and finances the rest over 30 years, the mortgage payment can look manageable until property taxes and insurance are added.
Testing an extra 200 per month is useful because even modest overpayments often shave years off a long mortgage.
How to interpret the results
Loan amount tells you how much debt is being financed. Monthly housing cost tells you the total monthly burden. Total interest highlights the long-run price of the mortgage rate and term combination.
If the monthly cost feels acceptable only when tax and insurance are ignored, the property may be outside your sustainable budget range.
Common mistakes
- Looking only at principal and interest and forgetting property taxes, insurance, and ownership fees.
- Using a low teaser rate rather than the rate you expect to pay over the actual mortgage term.
- Ignoring closing costs when comparing buy scenarios or refinance options.
Key terms
Quick definitions for the finance terms that matter on this page.
Principal and interest
The core mortgage payment before taxes, insurance, and HOA dues are added.
Down payment
The portion of the home price paid upfront rather than financed into the mortgage.
Frequently asked questions
Clear answers on assumptions, interpretation, and the limits of each estimate.
Does this mortgage calculator include escrow items?
It can estimate them if you add property tax and home insurance, but lender escrow treatment can still vary.
Will extra principal always pay off a mortgage early?
For a standard fixed-rate mortgage, consistent extra principal usually shortens the term and lowers total interest unless a lender applies the payment differently or charges a penalty.
Should closing costs be added to the loan amount?
Not by default. Keeping them separate makes the total cost of buying easier to understand.
Can I use this for adjustable-rate mortgages?
Only as a rough starting point. Adjustable-rate loans need scenario testing because the payment can change after the fixed period ends.
Related calculators
Continue your planning with tools that answer the next logical question.
Loan Calculator
Estimate monthly payments, total interest, payoff time, and amortization for standard installment loans.
Refinance Calculator
Compare current mortgage terms with a refinance offer to estimate payment changes, interest savings, and break-even timing.
Rent vs Buy Calculator
Compare the estimated cost of renting with the estimated net cost of buying over a planned time horizon.
Inflation Calculator
Measure future cost, lost purchasing power, and inflation-adjusted value over time.
Important disclaimer
United States home finance rules, transfer taxes, and insurance requirements can vary by region and lender, so confirm final numbers locally before committing.