Skip to main content
Simple Calculators

Debt Payoff Calculator

Compare avalanche vs. snowball strategies and build your fastest path to debt freedom

Debt Payoff Calculator

Avalanche minimizes total interest paid — mathematically optimal.

$

Any amount above all minimum payments combined

$
$
$
$

Related calculators

All finance

Quick summary

A debt payoff calculator helps you choose between the avalanche (pay highest-rate debt first — saves the most money) and snowball (pay smallest balance first — builds motivation) strategies, and shows you how much extra monthly payments speed up your debt-free date.

Reviewed by Simple Calculators TeamLast reviewed

For planning only — not financial or tax advice. Results are estimates based on your inputs and the stated assumptions. Confirm important decisions with a qualified professional.

How to use this calculator

  1. Enter the inputs requested by the calculator.
  2. Choose the units or options that match your situation and review the assumptions.
  3. Run or update the calculation to see the result.
  4. Review the result, breakdown, and formulas shown on the page.
  5. Check the inputs, units, dates, and limitations before saving or sharing the result.

Debt Payoff Strategies

Debt Avalanche (Interest Minimization)

Target=arg⁡max⁡i{ri}where bi>0\text{Target} = \arg\max_i\{r_i\} \quad \text{where } b_i > 0
rᵢ
Annual interest rate of debt i
bᵢ
Remaining balance of debt i

Worked example

Three debts: CC 19.99%, car 7.5%, student 5.8%

Given
Order = CC → Car → Student Loan
Calculation
Extra payment→highest rate first\text{Extra payment} \to \text{highest rate first}
Result
Minimizes total interest paid

Debt Snowball (Motivation Method)

Target=arg⁡min⁡i{bi}where bi>0\text{Target} = \arg\min_i\{b_i\} \quad \text{where } b_i > 0
bᵢ
Remaining balance of debt i

Worked example

Three debts: CC $5k, car $12k, student $25k

Given
Order = CC → Car → Student Loan
Calculation
Extra payment→lowest balance first\text{Extra payment} \to \text{lowest balance first}
Result
Builds momentum through quick wins

Frequently asked questions

Which is better — debt avalanche or debt snowball?

The avalanche always saves more money because it eliminates high-rate debt first. The snowball is better for people who need motivational wins to stay on track — quick payoffs of small debts can keep you motivated. Research (Amar et al., 2011) shows people often overpay on small debts emotionally, so choose the method you will actually stick with.

What is the "debt avalanche"?

In the avalanche method, you make minimum payments on all debts and direct all extra money to the debt with the highest interest rate. Once that's paid off, that payment plus the freed minimum rolls to the next highest-rate debt. This is mathematically optimal.

What is the "debt snowball"?

Popularized by Dave Ramsey, the snowball targets the smallest balance first. After paying it off, you roll that payment to the next smallest. It creates quick wins that build momentum. You may pay more interest total, but many people find it easier to stick with.

How much does an extra $100/month matter?

Significantly. On a $10,000 debt at 20% APR with a $200 minimum, adding just $100/month cuts payoff time by roughly 40% and saves thousands in interest. Use this calculator to see your specific numbers.

Key terms

Debt Avalanche
A payoff strategy targeting the highest-interest debt first to minimize total interest paid.
Debt Snowball
A payoff strategy targeting the lowest-balance debt first to build motivation through quick wins.
Minimum Payment
The smallest amount you must pay each month to keep an account in good standing and avoid late fees.
Debt Cascade / Rollover
When a debt is paid off, its payment amount is redirected to the next target debt, accelerating payoff.

Methodology, sources & limitations

This page shows the formula, assumptions, and limitations used for this estimate. Rates, thresholds, and other time-sensitive inputs can change, so verify them against the relevant official source before relying on a result.

For our review approach and the primary sources we consult, see the methodology and source policy. If you spot an outdated figure or formula, please contact us with a correction.