Mortgage Amortization Calculator

How This Mortgage Amortization Calculator Works

This mortgage amortization calculator estimates how a home loan is paid down over time. Each payment is separated into principal and interest, and the remaining balance is recalculated after every monthly payment.

Early in a mortgage, a larger portion of the payment usually goes toward interest because the loan balance is still high. As the balance decreases, more of each payment goes toward principal. The amortization schedule helps you see that shift month by month and year by year.

What this calculator includes

• Principal and interest payment estimate

• Annual amortization summary

• Full monthly amortization schedule

• Extra monthly principal payment option

• One-time principal payment option

• Total interest estimate

• Interest saved and time saved estimate

• Estimated PMI removal timing

• CSV, PDF, and print options

Mortgage Amortization vs. Mortgage Payment

A mortgage payment calculator focuses mainly on the monthly house payment. A mortgage amortization calculator goes deeper by showing how each payment affects the loan balance over time.

• Calculator: Mortgage Payment Calculator
  Main Purpose: Estimate monthly housing cost including taxes, insurance, PMI, and HOA fees.
  Best For: Quick monthly budget planning.

• Calculator: Mortgage Amortization Calculator
  Main Purpose: Show principal, interest, remaining balance, payoff date, and extra payment effects.
  Best For: Understanding the full payoff schedule.

How Extra Mortgage Payments Can Save Interest

Extra mortgage payments reduce the principal balance faster. Since mortgage interest is based on the outstanding balance, reducing principal sooner can lower total interest and shorten the payoff timeline.

This calculator compares your regular mortgage schedule with the schedule created by your extra monthly payment and one-time principal payment. The difference is shown as estimated interest saved and time saved.

15-Year vs. 30-Year Mortgage Amortization

A 15-year mortgage usually builds equity faster and costs less in interest, but the monthly payment is higher. A 30-year mortgage usually has a lower monthly payment, but interest accumulates for a longer period.

• Feature: Monthly Payment
  15-Year Mortgage: Higher
  30-Year Mortgage: Lower

• Feature: Total Interest
  15-Year Mortgage: Lower
  30-Year Mortgage: Higher

• Feature: Principal Paydown
  15-Year Mortgage: Faster
  30-Year Mortgage: Slower

• Feature: Equity Growth
  15-Year Mortgage: Faster
  30-Year Mortgage: Slower

• Feature: Budget Flexibility
  15-Year Mortgage: Lower
  30-Year Mortgage: Higher

Mortgage Glossary

Amortization: The process of paying down a loan through scheduled payments over time.

Principal: The amount borrowed and the part of the payment that reduces the loan balance.

Interest: The cost charged by the lender for borrowing money.

Equity: The portion of the home value not covered by the mortgage balance.

PMI: Private mortgage insurance that may apply when the down payment is below 20%.

LTV: Loan-to-value ratio, which compares the loan balance to the home value.

Related Mortgage and Finance Calculators

Use these related CalcuCenter tools to compare payments, amortization, affordability, refinancing, renovation financing, and general loan costs.

• Mortgage Payment Calculator
  Estimate monthly housing cost including principal, interest, taxes, insurance, PMI, and HOA.

• Mortgage Refinance Calculator
  Compare current and proposed mortgage payments, closing costs, break-even time, and savings.

• Mortgage Affordability Calculator
  Estimate how much house may fit your income, debt, down payment, and monthly budget.

• FHA 203(k) Renovation Loan Calculator
  Estimate renovation financing, repair budgets, mortgage insurance, and monthly costs.

• Loan Payment Calculator
  Estimate monthly payments, total interest, extra payments, and payoff timing.

• All Mortgage Calculators
  Browse mortgage tools for payments, amortization, affordability, refinancing, and renovation financing.

Mortgage Amortization Calculator FAQ

What is a mortgage amortization schedule?

A mortgage amortization schedule is a table showing each mortgage payment, how much goes toward principal, how much goes toward interest, and the remaining loan balance after each payment.

How is this different from a mortgage payment calculator?

A mortgage payment calculator focuses on estimating the monthly payment. A mortgage amortization calculator focuses on the full payoff schedule and how the loan balance changes over time.

Can I enter a decimal mortgage rate?

Yes. You can enter rates such as 6.25, 6.5, or 5.875. The calculator keeps the decimal rate for a more realistic estimate.

How do extra mortgage payments help?

Extra payments reduce the principal balance faster. That can lower total interest and may shorten the mortgage payoff timeline.

Does this calculator include taxes and insurance?

Yes. You can enter annual property taxes and annual homeowners insurance. These are included in the estimated monthly housing cost, but they do not reduce the mortgage balance.

When does PMI go away?

PMI often becomes removable when the loan balance reaches approximately 80% of the home's value. This calculator gives an estimate, but lender and loan rules may vary.

Can I export the amortization schedule?

Yes. Use the CSV / Excel export button to download the full schedule. You can also download a PDF summary or print the page.

Is this calculator exact?

No. It is an estimate for planning purposes. Actual payments may vary because of lender rules, escrow changes, taxes, insurance, PMI rules, fees, and payment posting dates.