AHA! MONEY TOOLS
What could an extra
$100 a month change?
Mortgage amortization & early payoff calculator for 15- and 30-year fixed U.S. loans. See the interest you could save, the time you could reclaim, and every payment along the way.
YOUR NUMBERS
Start with your loan
Demo numbers are examples, not current market rates.
Calculated in your browser. Your loan inputs are not sent to our server.
THE DIFFERENCE
Small extra payments. A different finish line.
| Your loan | Scheduled payments | With extra principal |
|---|---|---|
| Payoff time | 30 years | 26 years |
| Total interest | $382,636.71 | $321,640.90 |
| Total principal + interest | $682,636.71 | $621,640.90 |
*The last payment can be smaller. No taxes, insurance, PMI, HOA dues, fees, or prepayment penalties are included.
MONTH BY MONTH
Amortization schedule
| Month | Total payment | Scheduled principal | Interest | Extra principal | Balance |
|---|---|---|---|---|---|
| 1 | $1,996.20 | $271.20 | $1,625.00 | $100.00 | $299,628.80 |
| 2 | $1,996.20 | $273.21 | $1,622.99 | $100.00 | $299,255.59 |
| 3 | $1,996.20 | $275.23 | $1,620.97 | $100.00 | $298,880.36 |
| 4 | $1,996.20 | $277.26 | $1,618.94 | $100.00 | $298,503.10 |
| 5 | $1,996.20 | $279.31 | $1,616.89 | $100.00 | $298,123.79 |
| 6 | $1,996.20 | $281.36 | $1,614.84 | $100.00 | $297,742.43 |
| 7 | $1,996.20 | $283.43 | $1,612.77 | $100.00 | $297,359.00 |
| 8 | $1,996.20 | $285.51 | $1,610.69 | $100.00 | $296,973.49 |
| 9 | $1,996.20 | $287.59 | $1,608.61 | $100.00 | $296,585.90 |
| 10 | $1,996.20 | $289.69 | $1,606.51 | $100.00 | $296,196.21 |
| 11 | $1,996.20 | $291.80 | $1,604.40 | $100.00 | $295,804.41 |
| 12 | $1,996.20 | $293.93 | $1,602.27 | $100.00 | $295,410.48 |
Each row uses the prior balance × annual rate ÷ 12 for interest, rounded to cents. Remaining regular payment reduces principal; extra principal follows. A final cent-rounding adjustment settles the balance.
THE STORY BEHIND THE NUMBERS
Does paying $100 extra on your mortgage really help?
Why extra principal changes future interest—and what to check before you send it.
Read the story
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