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Mortgage Amortization Calculator
Build a fixed-rate mortgage amortization estimate and review how principal and interest change over time.
Review your result
Your result
Ready when you are.
Enter your values and select Calculate. Your result stays on this device.
How it works
Each monthly payment is split between interest on the remaining principal and principal repayment; an optional extra amount is applied to principal in this estimate.
Assumptions
Fixed interest rate, monthly payments, and the same extra payment every month. It excludes escrow costs, lender fees, and prepayment terms.
About this calculator
An amortization schedule shows why more of an early fixed payment is typically interest and more of a later payment is principal. You can also test a consistent extra principal amount.
How to use it
- Enter the current loan amount, rate, and original or remaining fixed term.
- Optionally add a recurring extra principal amount.
- Review the first-year schedule and estimated payoff time.
- Use your servicer statement for the official balance and payoff amount.
Use case
mortgage amortization calculator: a clear planning check
Build a fixed-rate mortgage amortization estimate and review how principal and interest change over time. The stated formula, assumptions, and result limits remain visible so the calculation can be checked in context.
Use a clear mortgage amortization calculator scenario with values you can verify before relying on the result.
Source and update
Last reviewed: 2026-08-08
Consumer Financial Protection Bureau mortgage guidanceFrequently asked questions
What is mortgage amortization?
It is the repayment pattern that allocates each payment between interest and principal over the loan term.
Do extra payments reduce interest?
They can when credited to principal. Confirm the payment-posting procedure and any prepayment terms with your servicer.
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