Transparent method
The formula
Worked example
Example inputs
How to interpret the result
Reverse-solving payoff time from a chosen payment only reflects reality if every extra dollar paid is actually being applied to principal, since some servicers default to holding extra payments as a credit toward the next regular payment rather than immediately reducing the balance it's meant to shrink.
Before you rely on it
What to check
Confirm with your servicer directly that extra payments are being applied to principal immediately, not held or applied to future scheduled payments instead.
The common error
Where people go wrong with mortgage payoff calculator
Assuming an extra payment automatically reduces principal the moment it's sent. Some servicers apply it differently by default, and confirming the actual application is the only way to know the payoff calculation is tracking reality.
Sensitivity evidence
How annual interest rate changes the estimated payoff term
| Annual interest rate | Estimated payoff term | Estimated total interest | Estimated final payoff total |
|---|---|---|---|
| 5.5% | 51.1 months | $3,098 | $28,098 |
| 6.5% | 52.3 months | $3,777 | $28,777 |
| 7.5%worked example | 53.6 months | $4,502 | $29,502 |
| 8.5% | 55.1 months | $5,278 | $30,278 |
| 9.5% | 56.6 months | $6,111 | $31,111 |
Every input, tested
Which input moves the estimated payoff term most
| Input | Tested from | To | Estimated payoff term at each end | Swing |
|---|---|---|---|---|
| Monthly payment | $495 | $605 | 60.9 months to 48.0 months | 12.9 months (24%) |
| Amount borrowed | $22,500 | $27,500 | 47.4 months to 60.1 months | 12.7 months (24%) |
| Annual interest rate | 6.5% | 8.5% | 52.3 months to 55.1 months | 2.7 months (5.1%) |
Two variables at once
Estimated payoff term by annual interest rate and amount borrowed
| Annual interest rate \ Amount borrowed | $20,000 | $25,000 | $30,000 |
|---|---|---|---|
| 5.5% | 39.9 months | 51.1 months | 62.9 months |
| 6.5% | 40.6 months | 52.3 months | 64.8 months |
| 7.5% | 41.4 months | 53.6 months | 66.9 months |
| 8.5% | 42.2 months | 55.1 months | 69.2 months |
| 9.5% | 43.1 months | 56.6 months | 71.7 months |
Step by step
The worked example, input by input
| Input | Value used |
|---|---|
| Amount borrowed | $25,000 |
| Annual interest rate | 7.5% |
| Monthly payment | $550 |
| Estimated payoff term | 53.6 months |
| Estimated total interest | $4,502 |
| Estimated final payoff total | $29,502 |
Where the inputs come from
Enter the current principal balance from your latest statement, the note rate and the monthly principal-and-interest payment you plan to make. Do not include escrow for taxes and insurance, because those payments do not reduce the loan. If the servicer collects an escrow, subtract it from the total payment before entering.
When the result stops applying
The estimate assumes the payment stays constant and no fees are added. An adjustable-rate mortgage changes the schedule at each reset. If you have PMI, its removal changes the total payment but not the principal calculation. Servicers may apply extra payments to future installments instead of principal unless you specify.
What to compare it with
Set a target payoff date, for example before retirement, and work backward to the payment it requires. The extra mortgage payment calculator and the amortization schedule give a cross-check. Compare the value of paying off with the return on other uses of money, and keep an emergency fund. If the rate is low, a slower payoff can leave more money for goals that earn more, but many people value the certainty of being debt free.
People also ask
Frequently asked questions
How is this different from an amortization schedule?
This tool solves for how long the loan lasts at a payment you choose, while an amortization schedule lists every payment with its interest and principal split. Use this one to test payment amounts and the schedule to see the detail.
Do escrow payments count toward payoff?
No. Escrow pays the property tax and insurance bills and does not reduce your loan balance, so enter only the principal-and-interest part of your payment. Including escrow would make the payoff look sooner than it will be.
Will extra payments change my due date?
Not unless you ask the servicer. Extra principal shortens the loan and removes interest, but the required monthly payment and due date stay the same, so you keep paying on schedule until the balance reaches zero.