Debt Payoff Calculator

Build a multi-debt payoff schedule with recurring and one-time extra payments.

Allocate extra payments to the highest-rate debt, optionally rolling freed payments forward.

Result

Months until debt-free30

Total interest$2,185.22

Total paid$10,185.22

Principal
Interest

Calculation details

Scroll horizontally or vertically to see more. Download CSV for the complete schedule.

Month	Total payment	Interest	Total balance	Card A	Card B
1	350	136.67	7,786.67	4,841.67	2,945
2	350	132.94	7,569.61	4,680.43	2,889.18
3	350	129.15	7,348.75	4,516.24	2,832.51
4	350	125.29	7,124.04	4,349.04	2,775.00
5	350	121.36	6,895.39	4,178.77	2,716.63
6	350	117.36	6,662.75	4,005.38	2,657.37
7	350	113.29	6,426.05	3,828.81	2,597.24
8	350	109.15	6,185.20	3,649.01	2,536.19
9	350	104.94	5,940.14	3,465.90	2,474.24
10	350	100.66	5,690.80	3,279.45	2,411.35
11	350	96.29	5,437.09	3,089.57	2,347.52
12	350	91.85	5,178.94	2,896.21	2,282.73
13	350	87.34	4,916.28	2,699.31	2,216.97
14	350	82.74	4,649.02	2,498.80	2,150.23
15	350	78.06	4,377.09	2,294.61	2,082.48
16	350	73.31	4,100.39	2,086.67	2,013.72
17	350	68.46	3,818.86	1,874.93	1,943.93
18	350	63.53	3,532.39	1,659.30	1,873.08
19	350	58.52	3,240.91	1,439.72	1,801.18
20	350	53.41	2,944.32	1,216.12	1,728.20
21	350	48.22	2,642.54	988.42	1,654.12
22	350	42.93	2,335.47	756.54	1,578.93
23	350	37.55	2,023.02	520.41	1,502.62
24	350	32.08	1,705.10	279.95	1,425.16
25	350	26.51	1,381.61	35.08	1,346.53
26	350	20.84	1,052.45	0	1,052.45
27	350	15.79	718.24	0	718.24
28	350	10.77	379.01	0	379.01
29	350	5.69	34.70	0	34.70
30	35.22	0.52	0	0	0

How to use this calculator

Allocate extra payments to the highest-rate debt, optionally rolling freed payments forward. Enter amounts in the units shown, select the applicable options, and click Calculate. Use Reset to restore the starting values.

Calculation formula

Accrue each loan’s interest separately and apply minimums followed by avalanche extra payments.

Assumptions and accuracy

Review timing, rates, fees and result notes when comparing scenarios. Future returns and rates are assumptions rather than guaranteed outcomes. Monetary display follows the currency’s precision; intermediate calculations retain additional digits.

Choose what to calculate

Debt payoff calculator

Model highest-interest-first debt repayment with extra monthly, annual or one-time payments. Choose whether freed payments roll forward; no new borrowing is assumed.

Open this calculation

Debt snowball calculator

Pay minimums on every debt, then direct extra money to the smallest remaining balance. Compare with the highest-interest-first avalanche plan; neither strategy changes the entered APRs.

Open this calculation

Understanding this calculation

Debt payoff plans pay each minimum first, then allocate extra money by your selected strategy. Avalanche prioritizes high APR; snowball prioritizes small remaining balances.

Reading your result

Months until debt-free: The number of modeled monthly payments needed to clear all listed debts.
Total interest: Interest accrued across all debts under the selected strategy and budget.
Total paid: Starting balances plus modeled interest; new borrowing and additional fees are excluded.

Compare two scenarios

Compare Avalanche and Debt Snowball with exactly the same debts, extra payments and rollover choice.
Then increase the extra monthly amount without changing the strategy to isolate the effect of payment size.

Check before comparing

APR values in the debt list are annual percentages; balances and minimum payments are dollar amounts.
Keeping the total payment fixed rolls freed payments into other debts; turning rollover off changes the budget.
Snowball does not guarantee the lowest interest bill.

Result explanations checked 2026-10-21 against this calculator’s local model. Model scope and sources appear below.

Worked examples

Use extra payments on multiple zero-rate debts

Illustrative inputs are specified in the steps below; the example link loads the complete settings. Unmentioned settings use the linked defaults.

Minimums total 100 and the extra payment is 100. With rollover and no interest, a total 200 monthly repays 1,200 in six months.

Total interest: 0 USD.

Try these inputs

Pay the smallest balance first with a debt snowball

Two debts: $100 at 0% APR with a $10 minimum, and $1,000 at 12% APR with a $100 minimum. Add $100 per month and roll freed payments forward.

The first month adds $10 interest to the larger debt.
Pay minimums of $10 and $100, then clear the remaining $90 of the small debt.
The final $10 of extra money goes to the larger debt; balances are $0 and $900 after month one.
Subsequent balances are $699, $495.99, $290.9499 and $83.859399; the last payment is $84.69799299.

First-month payment is $210 and the combined ending balance is $900.

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Common questions

What does payment rollover mean?

When a debt is repaid, its freed payment can be redirected to remaining debts rather than reducing the overall repayment budget.

Can I add an annual bonus to debt payoff?

Use the annual or one-time extra-payment settings and verify their timing. Do not also count the same amount as recurring monthly extra.

What is the difference between debt snowball and debt avalanche?

Both pay the entered minimum on every debt first. Snowball applies extra money to the smallest remaining balance, while avalanche applies it to the highest APR. This implementation ranks balances after monthly interest and minimum payments. Choose the separate mode to calculate either plan; snowball is not guaranteed to minimize interest.

Scope and assumptions

The strategy is an entered cash-flow plan, not a negotiated debt settlement. Fees, variable rates and new borrowing are outside unentered assumptions.

Sources

Calculation notes checked October 21, 2026. Examples are mathematical checks under the stated assumptions.

Calculation methods and formulas

Debt Payoff Plan