Debt-to-Income Ratio Calculator: How It Works
The DTI formula lenders use — front-end vs back-end ratios, the 36/43 thresholds, and how to lower your number.
The ratio behind roughly a third of your score, computed both ways: per-card and aggregate — plus the limit-increase scenarios worth testing.
A utilization calculator replicates what scoring models compute each reporting cycle: each card's balance-to-limit percentage and the aggregate across all of them. Because issuers report statement-closing balances, the tool's inputs should be statement balances — not current balances — for accurate modeling.
The value is scenario testing: before requesting a limit increase, paying down a specific card, or closing an old account, you can see exactly where each ratio lands against the thresholds models are known to respond to.
Scoring models weigh both overall utilization and the highest per-card ratio. Under 30% is a common benchmark; under 10% is stronger.
Enter balances and limits to see per-card and overall utilization.
Enter each card's statement balance and credit limit. The tool outputs every individual ratio plus the aggregate — and flags any card above common thresholds. A maxed individual card hurts even when aggregate utilization looks fine, which is why both views matter.
Scenario mode answers the questions that matter: 'If I pay $800 on this card, where does each ratio land?' and 'If that old card closes, what happens to the denominator?' Since closing a card shrinks total limits, the calculator shows immediately why closures can raise utilization without any new spending.
CFPB consumer guidance names utilization as a primary scoring factor and advises keeping balances low relative to limits — the exact ratio this tool computes. FTC credit-education materials confirm that consumers should know both their limits and reported balances when evaluating score impacts.
Funditia's calculator performs standard ratio arithmetic for education; scoring models weigh utilization differently across versions, and no ratio guarantees a specific score.
Educational references: Consumer Financial Protection Bureau (consumerfinance.gov) and Federal Trade Commission (consumer.ftc.gov). Funditia is an independent educational publication and is not a credit card issuer, lender, or credit repair organization.
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