Debt Payoff Calculator

Up to six debts: snowball vs. avalanche, payoff dates, total interest, and what +$25 to +$250 a month changes.

Two orders, one pot of money. Avalanche pays the highest interest rate first and costs the least in total interest. Snowball pays the smallest balance first, which costs a little more but closes accounts sooner, and some people keep going with it when they would have stopped otherwise.

Minimum payments are usually a percentage of the balance, so they shrink as the balance does. That is what makes minimum-only repayment so slow: the payment falls just as fast as the debt, and the finish line keeps moving.

Results

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Type your numbers on the left and press Calculate. Nothing you enter is saved.

See a worked example

Example figures

Extra beyond minimums (monthly)$150

Example results

Total debt$9,600 3 debts · minimums $199/month · extra $150/month

Snowball (smallest balance first)2 years 9 months debt-free around July 2029 · total interest $1,771

Avalanche (highest rate first)2 years 9 months debt-free around July 2029 · total interest $1,663

At minimum payments alone, at least one balance never pays off; the rollover plan is the exit.

Avalanche saves $108 in interest; snowball clears 'Store card' first for the early win. The best method is the one you'll still run in month eight.

Extra beyond current (avalanche)	Time to debt-free	Total interest	Interest saved
+$25/month	2 years 6 months	$1,508	$155
+$50/month	2 years 4 months	$1,381	$281
+$100/month	2 years 1 month	$1,187	$476
+$250/month	1 year 6 months	$846	$817

Fixed total budget with rollover: as each debt dies, its payment joins the attack on the next.

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