Top 5 Debt-Payoff Calculators That Make Snowball Math Simple
Written by Diversification.com Editorial Team • Updated June 30, 2025
5 min read • This article was created using publicly available data at the time of publication. The list includes editorial opinions, is not financial advice, and there are no paid placements.
Paying down high-interest debt quickly can save thousands in interest and reduce financial stress. These calculators require no subscriptions, support both snowball (smallest-balance first) and avalanche (highest-rate first) methods, and are hosted on sites with dedicated blog posts or help-center resources.
How We Selected These Debt-Payoff Calculators
To make this list, each calculator had to meet all three criteria:
- Free web calculator: No fees or registrations.
- Snowball/avalanche support: Models both popular payoff strategies.
All tools were verified as of mid-2025.
1. Undebt.it
- Cost: Free web tool
- Strategy Support: Debt snowball and debt avalanche methods
- Access: Web interface
- Resources: Dedicated blog posts
- Notable Details: Offers five payoff methods—including smallest balance, highest interest, fastest payoff, by date, and custom ordering
2. Avalanche vs Snowball Calculator (OpeSway)
- Cost: Free web calculator
- Strategy Support: Side-by-side comparison of snowball and avalanche outcomes
- Access: Web tool
- Resources: Personal-finance blog post explaining both strategies and step-by-step use
- Notable Details: Visual chart highlights interest saved vs. payoff time for each strategy
3. Debt Payoff Calculator: Snowball vs. Avalanche (CalculatorLive)
- Cost: Free calculator
- Strategy Support: Compares snowball and avalanche methods in one view
- Access: Web-based
- Resources: CalculatorLive FAQs with user guides and optimization tips
- Notable Details: Customizable debt entries, extra-payment scheduling
4. Advanced Debt Payoff Calculator (SimplyTools)
- Cost: Free web tool
- Strategy Support: Detailed comparison of avalanche vs. snowball strategies
- Access: Web interface
- Resources: Step by step guide on how to use the tool
- Notable Details: Calculates total interest savings, payoff timelines
5. Debt Snowball Calculator (Good Calculators)
- Cost: Free online tool
- Strategy Support: Illustrates both snowball and avalanche pay-off schedules
- Access: Web-based
- Resources: Good Calculators site with methodology notes
- Notable Details: Generates balance-chart visuals and downloadable PDFs of payoff schedules
In Summary
These five free, blogger-backed calculators demystify snowball and avalanche math, empowering borrowers to choose the optimal payoff path, minimize interest payments, and track progress—all with no cost or complicated spreadsheets.
Disclosures
- Data verified as of June 30, 2025
- This article is not financial advice
- Calculator features and availability may change; always verify directly with each provider.
