Why use this calculator
A mortgage calculator gives you a complete picture of your monthly housing costs beyond just principal and interest. By including property taxes and insurance, you get a realistic view of what homeownership will actually cost each month. This helps you determine how much house you can truly afford and prevents budget strain.
How to use it
Enter the home purchase price, your planned down payment, the mortgage interest rate, and loan term. Optionally add annual property tax and insurance estimates for a complete monthly payment picture. Adjust the down payment to see how it affects your monthly costs.
The formula
The principal and interest portion uses the standard amortization formula. Property tax and insurance are simply divided by 12 and added to the monthly payment. Total Monthly = P&I + (Annual Tax / 12) + (Annual Insurance / 12).
Worked examples
$400,000 home with 20% down at 6.5% for 30 years
Total monthly payment of $2,575 including taxes and insurance
$300,000 home with 10% down at 7% for 15 years
Higher monthly payment but massive interest savings
When people use it
- Determining how much house you can afford
- Comparing different down payment scenarios
- Budgeting for total monthly housing costs
- Evaluating the impact of different interest rates
Tips
- Aim for 20% down payment to avoid PMI (Private Mortgage Insurance)
- Your total housing cost should ideally be under 28% of gross monthly income
- Get pre-approved to know your actual rate before house hunting
- Consider a 15-year mortgage if you can afford the higher payments
Questions people ask
- What is PMI and when do I need it?
- Private Mortgage Insurance (PMI) is typically required when your down payment is less than 20% of the home price. It protects the lender and adds to your monthly cost, usually 0.5-1% of the loan amount annually.
- How much should I put as a down payment?
- While 20% is ideal to avoid PMI, many programs allow as little as 3-5% down. However, a larger down payment reduces your loan amount, monthly payment, and total interest paid.
- Are property taxes included in my mortgage payment?
- Often yes, through an escrow account. Your lender collects tax and insurance payments monthly along with your mortgage, then pays these bills on your behalf.