Debt Calculator

The debt calculator is the overview hub for comparing multiple payoff strategies in one place. Instead of looking at a single balance, it lets you enter several debts and test four different paths: minimum payments, debt snowball, debt avalanche, and consolidation. The output shows payoff time, monthly payment, total interest, total paid, and a comparison table for all strategies. That makes it useful for deciding whether you need motivation, lower interest, simpler payments, or basic baseline visibility.

This page connects several more focused calculators. If you want only one balance, use the debt payoff calculator. If you want the smallest-balance-first method, use the debt snowball calculator. If you want the highest-rate-first method, use the debt avalanche calculator. If you are evaluating a new replacement loan with a term and dollar fees, use the debt consolidation calculator. For household affordability, pair any result with the budget calculator and debt-to-income calculator.

Strategy behind the calculator

The calculator first cleans the debt list. A debt is included only when it has a positive balance, a positive payment, and a finite APR. APR is converted from a percentage into a decimal annual rate. The calculator then runs separate simulations for each strategy.

Minimum-payment mode applies monthly interest to each active debt and pays only that debt’s entered payment. When a debt disappears, its payment does not move to another account. Snowball and avalanche work differently. They keep the total monthly payment constant by combining all entered payments with the extra payment. After interest is added, the calculator pays each debt’s minimum, then sends remaining payment power to a target. Snowball targets the smallest active balance. Avalanche targets the highest active APR. Consolidation combines the original balances, adds a percentage fee, and pays the new single balance with the same total payment used by the rollover strategies.

Formula

For each debt, monthly interest is:

$\text{monthly interest} = \text{balance} \times \frac{\text{APR}}{12}$

The rollover payment used by snowball and avalanche is:

$\text{rollover payment} = \sum \text{entered payments} + \text{extra payment}$

The consolidation loan balance is:

$\text{consolidation balance} = \text{total debt} \times \left(1 + \text{fee rate}\right)$

The monthly loop is:

$\text{new balance} = \text{balance} + \text{monthly interest} - \text{payment applied}$

The calculator stops when every active balance is paid or when the simulation exceeds its limit.

Example: totaling debt balances

Use the default debts: a credit card with USD 6,000 at 19.99 percent APR and a USD 180 payment, a personal loan with USD 9,000 at 11.5 percent APR and a USD 220 payment, and a student loan with USD 14,000 at 6.25 percent APR and a USD 190 payment. Total debt is USD 29,000 and entered payments total USD 590. The default extra payment is USD 150, so snowball, avalanche, and consolidation use USD 740 per month.

Minimum payments take 94 months and charge about USD 9,015.10 of interest because payments are not rolled forward. Snowball and avalanche both take 47 months and charge about USD 5,564.35 of interest in this particular default example. That tie happens because the smallest balance also has the highest APR, then the next smallest balance has the next highest APR, so both methods attack debts in the same order. Consolidation adds the default 2 percent fee to the combined balance, creating a new balance of USD 29,580. At the default 8.5 percent APR with a USD 740 payment, it takes 48 months and charges about USD 5,319.27 of interest on the new loan. Total paid is about USD 34,899.27, which includes the financed fee.

The selected method controls the primary result. If avalanche is selected by default, the page reports 47 months, about USD 5,564.35 of interest, about USD 34,564.35 total paid, and a USD 740 monthly payment.

Snowball versus avalanche tradeoff

Snowball and avalanche are intentionally different. Snowball ranks balances from smallest to largest. It can close accounts quickly and may help people continue because progress is visible. Avalanche ranks APRs from highest to lowest. It generally lowers interest because extra principal is removed from the most expensive debt first. The calculator’s comparison table is valuable because it shows when the difference matters and when it does not.

If the methods tie, as they do in the default inputs, choose based on clarity and motivation. If avalanche saves a meaningful amount and you can stay disciplined, it may be the stronger financial choice. If snowball costs somewhat more but keeps you consistent, it may be the stronger practical choice. The worst outcome is usually not choosing a strategy at all and sending extra payments randomly.

Tips for interpreting the results

• Treat minimum-payment mode as a baseline, not a finish line. It often takes longer because payments are not rolled forward.
• Enter realistic payments. If a payment does not cover monthly interest, the calculator correctly rejects the plan.
• Include consolidation fees. A lower APR can still lose if the fee is high or the payoff period stretches too long.
• Revisit the plan after any rate change, balance transfer, new charge, or missed payment.
• Keep a small emergency reserve so aggressive payoff does not create new high-rate borrowing.

Brief informational note

This calculator is informational. It does not negotiate with lenders, predict credit scores, or evaluate legal collection rights. Real accounts may use daily interest, changing minimums, penalty APRs, late fees, hardship programs, or settlement terms. If you are facing collection, lawsuits, or unaffordable payments, review official consumer resources and consider qualified help.

Sources

• CFPB, Debt collection — consumer information for debts, collectors, and borrower rights.
• CFPB, Ask CFPB: credit card debt consolidation — overview of consolidating credit card debt.
• CFPB, Credit cards — guidance on credit card repayment and costs.
• FTC, ReportFraud.ftc.gov — official FTC portal for reporting suspected scams.