Free Debt Calculators
Five free, accurate calculators to help you understand your credit card debt, plan your payoff, and make smarter financial decisions.
Credit Card Interest Calculator
Enter your current balance and APR to see exactly how much interest you’re paying each month — and how that number changes as your balance decreases.
- See your daily and monthly interest charge
- Understand how much of each payment is interest vs. principal
- Compare the impact of different APRs on the same balance
Debt Payoff Calculator
Find out exactly when you’ll be debt-free and how much total interest you’ll pay — based on your real balance, APR, and monthly payment amount.
- See your exact payoff date
- Compare different monthly payment amounts side by side
- Find out how much interest you save by paying more each month
Balance Transfer Calculator
Compare your current high-interest card against a 0% balance transfer offer — including the transfer fee — to see your real net savings.
- Calculate whether a balance transfer is worth it for your situation
- See total interest savings over the promotional period
- Factor in the 3–5% transfer fee automatically
Debt-to-Income Calculator
Calculate your DTI ratio — the same number lenders use to decide whether to approve you for a mortgage, car loan, or new credit card.
- Know your DTI before applying for a loan
- See how paying down debt affects your ratio
- Understand the 36% and 43% thresholds that matter to lenders
Minimum Payment Calculator
See the real cost of only making minimum payments — including how long it takes and how much extra interest you pay compared to a fixed monthly amount.
- See how long minimum payments keep you in debt
- Compare minimum payments vs. fixed payment amounts
- Calculate the interest cost difference between strategies
Frequently Asked Questions
Are these calculators free?
Yes, all five calculators are completely free to use with no signup required.
How accurate are the results?
Our calculators use standard financial formulas — the same calculations used by banks and credit card issuers. Results are accurate for the inputs provided. Actual amounts may vary slightly based on your specific billing cycle and issuer’s calculation method.
What APR should I enter?
Use the APR shown on your credit card statement or in your online account portal. This is usually labeled “Purchase APR” or “Variable APR.” If you have multiple cards, use each card’s specific rate.
Do the calculators store my data?
No. All calculations happen in your browser and no data is stored or transmitted. Your financial information stays completely private.
Financial Disclaimer: The content on this page is for informational and educational purposes only. It does not constitute financial, legal, or credit advice. DebtToolbox is not a financial advisor. Always consult a qualified financial professional before making decisions about your debt or finances.