Financial tool
Debt Payoff Calculator
Compare your current payment with an additional monthly payment, including payoff time, interest cost, and the remaining balance each month.
Current payment
Payoff time
2y 0m
Interest
$1,969.83
Total paid
$10,469.83
With the additional payment
Payoff time
1y 7m
Interest
$1,541.99
Total paid
$10,041.99
5 months sooner; $427.84 less interest under these assumptions.
Monthly schedule with additional payments (19 months)
| Month | Payment | Interest | Principal | Balance |
|---|---|---|---|---|
| 1 | $550.00 | $152.29 | $397.71 | $8,102.29 |
| 2 | $550.00 | $145.17 | $404.83 | $7,697.46 |
| 3 | $550.00 | $137.91 | $412.09 | $7,285.37 |
| 4 | $550.00 | $130.53 | $419.47 | $6,865.90 |
| 5 | $550.00 | $123.01 | $426.99 | $6,438.91 |
| 6 | $550.00 | $115.36 | $434.64 | $6,004.28 |
| 7 | $550.00 | $107.58 | $442.42 | $5,561.85 |
| 8 | $550.00 | $99.65 | $450.35 | $5,111.50 |
| 9 | $550.00 | $91.58 | $458.42 | $4,653.09 |
| 10 | $550.00 | $83.37 | $466.63 | $4,186.45 |
| 11 | $550.00 | $75.01 | $474.99 | $3,711.46 |
| 12 | $550.00 | $66.50 | $483.50 | $3,227.96 |
| 13 | $550.00 | $57.83 | $492.17 | $2,735.79 |
| 14 | $550.00 | $49.02 | $500.98 | $2,234.81 |
| 15 | $550.00 | $40.04 | $509.96 | $1,724.85 |
| 16 | $550.00 | $30.90 | $519.10 | $1,205.75 |
| 17 | $550.00 | $21.60 | $528.40 | $677.36 |
| 18 | $550.00 | $12.14 | $537.86 | $139.49 |
| 19 | $141.99 | $2.50 | $139.49 | $0.00 |
Fixed rate, monthly interest, and payments at month-end; no new purchases, fees, or missed payments. Credit cards often calculate interest daily, so statement amounts can differ. Starting values are illustrative, not an offer or recommendation.
Formula
Each month, interest is estimated as balance x (annual interest rate / 100) / 12. The rest of the payment reduces principal. The calculator repeats this until the balance reaches zero.
Example calculation
If you owe $8,500 at a 21.5% annual interest rate and pay $450 per month, part of each payment goes toward interest and the rest reduces the debt balance. Paying more than the minimum can shorten the timeline and reduce total interest.
FAQ
Why does the interest rate matter so much for debt payoff?
A higher interest rate adds more monthly interest, so less of each payment goes toward principal unless you increase the payment. This model excludes fees and uses monthly rather than daily interest.
What if my payment is too low?
If the payment does not cover monthly interest plus some principal, the balance may not fall. The calculator flags that situation.
Should I use avalanche or snowball payoff?
Avalanche targets the highest APR first to reduce interest. Snowball targets the smallest balance first for momentum. The best choice depends on behavior and goals.