Advanced Mortgage Amortization Calculator
*Estimates only. Does not include taxes, insurance, or HOA fees.
Understanding Your Mortgage Amortization
A mortgage is likely the largest debt you will ever take on, and understanding how the amortization schedule works is crucial for financial planning. This calculator helps you determine your monthly Principal and Interest (P&I) payments and illustrates the power of making extra monthly payments.
How Mortgage Amortization Works
Amortization is the process of spreading out a loan into a series of fixed payments over time. While your total monthly payment remains the same, the portion that goes towards principal versus interest changes every month.
- Early Years: The majority of your payment goes toward interest. The bank gets paid first.
- Later Years: As the principal balance decreases, less interest accrues, meaning more of your payment attacks the principal balance.
The Power of Extra Payments
One of the most effective ways to save money is by making extra payments towards your principal. Even a small amount, like $50 or $100 extra per month, can shave years off your loan term and save tens of thousands of dollars in interest.
When you input an "Extra Monthly Payment" in the calculator above, you will see exactly how much interest you save and how much faster you will own your home free and clear.
Formula Used
This calculator uses the standard annuity formula to determine the base monthly payment:
M = P [ i(1 + i)^n ] / [ (1 + i)^n – 1 ]
Where:
- M = Total monthly payment
- P = Principal loan amount
- i = Monthly interest rate (Annual Rate / 12)
- n = Number of months (Years * 12)
Frequently Asked Questions
Should I pay off my mortgage early?
This depends on your interest rate versus potential investment returns. If your mortgage rate is high (e.g., above 6%), paying it off early guarantees that return on your money. If rates are low, investing that extra money might yield higher returns.
Does this include taxes and insurance?
No. This calculator focuses strictly on Principal and Interest. Property taxes, homeowners insurance, and HOA fees are usually held in escrow and added on top of this figure.