How to use
- Replace the example inputs with your loan and property figures.
- Select Calculate to update the estimate and any schedule.
- Change one assumption at a time, then compare the result with the earlier scenario.
How this calculation works
The loan balance is the amount borrowed, not the purchase price. Interest is calculated on the outstanding balance each month. The rest of the scheduled payment reduces principal. Annual tax and insurance amounts are divided by twelve and added to the monthly estimate.
M = P × r ÷ [1 − (1 + r)^(−n)]
Worked example
Illustrative inputs — not a quote or a local average.
- Loan amount
- $320,000.00
- Interest rate
- 6.5 %
- Loan term
- 30 years
- Annual property tax
- $4,200.00
- Annual home insurance
- $1,800.00
- Monthly HOA dues
- $0.00
- Monthly mortgage insurance
- $0.00
Monthly housing estimate: $2,522.62. Principal & interest: $2,022.62. Total interest: $408,142.36.
Reading the result
Use the total housing estimate for your budget and principal-and-interest for comparing loan terms. Two properties with the same price can produce different monthly costs once their tax bills, insurance quotes and association dues are entered. Change one input at a time to see what is driving the difference.
Before acting on the estimate
Enter the note rate rather than APR. The starting numbers are an example, not a rate offer. Mortgage insurance is a separate monthly input and is not automatically canceled in this initial-payment calculation. A fixed loan payment does not freeze taxes, insurance or maintenance costs.

Questions, answered
Does the payment include maintenance?
No. Add a repair reserve and utilities to your household budget separately.
Should I enter the price or the loan amount?
Enter the amount financed after your down payment.