Calculate Your Monthly Mortgage Payment
Use this amortized mortgage calculator to estimate your monthly principal and interest payment, total interest cost, and full amortization schedule.
Tip: Set extra monthly principal above $0 to see how quickly you can reduce interest and pay off the loan early.
What is an amortized mortgage?
An amortized mortgage is a home loan where every scheduled payment includes both interest and principal. At the beginning of the loan, a larger share of each payment goes toward interest. Over time, that gradually shifts so more of your payment goes toward principal reduction.
This structure creates predictable monthly payments (for fixed-rate loans), which makes planning easier for budgeting, saving, and long-term financial decisions.
How mortgage amortization works
1) Your principal is the amount you borrow
If the purchase price is $350,000 and you put $70,000 down, your financed principal is $280,000.
2) Interest is charged monthly on the remaining balance
Each month, the lender applies the monthly interest rate to your current balance. As the balance decreases, the monthly interest charge also decreases.
3) Your monthly payment is calculated to pay off the loan by term end
For a fixed-rate mortgage, the standard payment formula creates a constant principal-and-interest payment that fully repays the loan at the end of the selected term (such as 15 or 30 years).
Why this calculator is useful
- Estimate monthly principal and interest payment.
- Compare different rates and loan terms before applying.
- See total interest paid over the life of the loan.
- Understand the impact of extra principal payments.
- View the complete amortization schedule month by month.
Key factors that affect your mortgage payment
Loan amount
A larger loan creates a larger payment. Increasing your down payment reduces principal and can significantly lower total interest.
Interest rate
Even small changes in interest rate can have a major long-term impact. For larger loans and long terms, a 0.5% rate difference can mean tens of thousands of dollars.
Loan term
Shorter terms (like 15 years) usually have higher monthly payments but lower total interest. Longer terms (like 30 years) reduce monthly payment but increase total interest paid.
Extra payments
Adding extra principal each month can shorten payoff time and reduce lifetime interest. This is one of the most effective ways to improve total mortgage efficiency.
Practical tips for buyers and homeowners
- Run multiple scenarios: Compare 15-year vs 30-year, and different rate assumptions.
- Stress test your budget: Make sure your payment is manageable alongside taxes, insurance, utilities, and maintenance.
- Use windfalls strategically: Bonuses or tax refunds can be applied to principal.
- Recalculate after refinancing: A lower rate can change both monthly payment and interest trajectory.
- Review amortization annually: Confirm your progress and adjust repayment strategy.
Frequently asked questions
Does this include PMI, HOA, and escrow setup?
The core amortization is principal + interest. You can include annual property tax and insurance in the input fields for an estimated monthly outflow, but lender-specific escrow details and PMI rules vary and should be confirmed with your lender.
Can I use this for zero-interest loans?
Yes. If interest rate is set to 0%, the payment is simply principal divided by number of months.
What if I make irregular extra payments?
This tool models a consistent extra monthly principal amount. If your extra payments vary, rerun the calculator with updated assumptions each time.
Bottom line
An amortized mortgage payment calculator helps you move from guesswork to clear numbers. Before signing a loan, evaluate your monthly payment, total interest cost, and payoff timeline. Small changes in rate, term, and extra payment can create large long-term differences in financial outcomes.
Educational use only. This is not financial, tax, or legal advice.