Debt Payoff Calculator

Introduction

This Debt Payoff Calculator models paying down several debts, cards and installment loans together, from one monthly pool using either snowball or avalanche priority. Enter each debt name, balance, APR, and minimum payment, then set extra money available beyond minimums. It outputs payoff sequence, debt-free date, and total interest for both strategies so you can pick the one you will execute.

Who this calculator is for

People with a messy liability list, perhaps a car note, two cards, and a medical bill, who finally have one number to send creditors each month belong here. It is broader than the credit-card-only payoff tool because installment loans sit in the same queue.

Coaches teaching snowball versus avalanche without building Excel macros rely on this page. If only one loan exists, use the Loan Calculator instead.

What it estimates

Each period every debt accrues interest and receives at least its minimum. Surplus follows strategy: avalanche sends extra to highest APR; snowball sends extra to smallest balance. When a debt zeros out, its minimum and any extra roll to the next target. The simulation runs until all rows hit zero. Order of identical APR balances may follow entry order; rename debts clearly in output for household accountability.

Variable rates, deferred student interest, and tax-deductible mortgage treatment are not special-cased. You can exclude a mortgage by omitting it if you are focusing on consumer debt only.

Inputs explained

Use current payoff balances, not original loan amounts.

• Debt list: Name each obligation for readable output, such as Card A, Auto, Medical.
• Balance: Amount owed today on each line.
• APR: Annual rate for interest accrual monthly unless the tool supports daily.
• Minimum payment: Required installment per debt before surplus allocation.
• Extra monthly budget: Additional dollars above all minimums combined.

How to read the results

Compare debt-free month under each strategy and total interest paid. Avalanche often wins on interest; snowball may eliminate the first debt name faster. The schedule shows rolling payments as accounts close.

If minimums alone exceed your budget, the tool should warn you. Fix income or seek hardship plans before choosing strategy.

Worked example

Three debts: Credit card $3,500 at 22%, personal loan $8,000 at 11%, medical $1,200 at 0%. Minimums total $310; you can pay $550 overall ($240 extra). Avalanche feeds the $240 to the 22% card first. First account gone in about nine months (medical if snowball, or high-rate card chunks depending on minimum split). Full freedom near twenty-eight months with total interest around $2,100.

Switch to snowball: medical $1,200 clears in two months, freeing its minimum plus extra toward the card. Emotional win early; interest may rise by $80 versus avalanche. Choose snowball if that keeps you on budget.

Practical use cases

Annual household finance night after tax refund season. Decide whether to attack the car loan or cards first when the car rate is lower but payment is suffocating cash flow (snowball may target car if balance is smallest, avalanche keeps car last if rate is low). Export the payoff order to share with a partner so both agree which account gets extra dollars each month.

Before consolidation, run baseline here then compare with debt consolidation calculator output. Maintain emergency savings so one bill does not refill cards. When you receive windfalls, rerun with a one-time extra payment column if the tool supports it, or temporarily raise the monthly pool for that scenario only.

Limitations and related tools

Does not model bankruptcy, settlement at cents on dollar, or 401(k) loan defaults. Tax deductibility of mortgage or student interest is ignored in interest totals.

Revolving-only portfolios: credit card payoff calculator. Single consolidation loan after payoff: Personal Loan Calculator. Monthly affordability: Budget Calculator.

How It Works

1. List every debt. Enter balance, APR, and minimum for each loan and card you are tackling.
2. Set total payment. Type the full monthly amount including all minimums and extra.
3. Run both strategies. Calculate avalanche and snowball separately with identical inputs.
4. Commit to one path. Pick the strategy you will follow for six months; rerun when income or balances change.

Formula and methodology

The Debt Payoff Calculator uses this identity for the scenario you enter. A bank, payroll system, or tax program may round on a 360-day year or average daily balance, so a statement can differ by a small amount.