Finance Toolkit › Free calculators

Debt Snowball vs. Avalanche Calculator

Compare both payoff strategies on your actual debts and see how much interest the avalanche method saves — and how many months each takes.

Debt 1

Balance ($)

APR (%)

Minimum payment ($/mo)

Debt 2

Balance ($)

APR (%)

Minimum payment ($/mo)

Debt 3 (optional)

Balance ($)

APR (%)

Minimum payment ($/mo)

Debt 4 (optional)

Balance ($)

APR (%)

Minimum payment ($/mo) Total you can put toward debt each month ($) Compare snowball vs. avalanche

The same calculation as an API

Building something? This page calls the same deterministic math the Finance Toolkit API exposes as JSON. Free tier, no signup, no key:

curl -s https://smeltworks.com/financetoolkit/v1/debt/plan \
  -H 'content-type: application/json' \
  -d '{"debts":[{"name":"Card A","balance":4200,"apr":22.9,"min_payment":95},{"name":"Card B","balance":1800,"apr":17.5,"min_payment":45}],"monthly_budget":400}'

See all endpoints and pricing →

Other free calculators

• Loan Payoff Calculator with Extra Payments
• Compound Interest Calculator with Monthly Contributions
• 50/30/20 Budget Calculator