Credit Utilization Calculator: Ratio & Score Impact 2026

How credit utilization is worked out

Credit utilization is the balance divided by the limit, times 100. Do it for each card on its own, and do it once for everything together: the total balance divided by the total limit, times 100. The bands are under 10% excellent, 10 to 29% good, 30 to 49% fair, 50 to 74% poor, and 75% or more very poor. Amounts owed are roughly 30% of a FICO score, as general guidance, not a guarantee — so the ratio is worth moving, and it is the part of a score that moves fastest, because it changes as soon as the balance changes.

At the defaults — Card A $1,500 on a $5,000 limit, Card B $1,000 on a $5,000 limit — Card A is $1,500 ÷ $5,000 × 100 = 30.00% (fair), Card B is $1,000 ÷ $5,000 × 100 = 20.00% (good), and the overall figure is ($1,500 + $1,000) ÷ ($5,000 + $5,000) × 100 = $2,500 ÷ $10,000 × 100 = 25.00% (good).

The worked example, line by line

Setup: Card A $1,500 on a $5,000 limit, Card B $1,000 on a $5,000 limit, extra payment $0.

Line 1 — Card A. $1,500 ÷ $5,000 × 100 = 30.00%, which is the fair band (30 to 49%).

Line 2 — Card B. $1,000 ÷ $5,000 × 100 = 20.00%, which is the good band (10 to 29%).

Line 3 — the overall figure. ($1,500 + $1,000) ÷ ($5,000 + $5,000) × 100 = $2,500 ÷ $10,000 × 100 = 25.00%, which is the good band.

Line 4 — the payment. The extra payment is $0, so the after-payment figure is the same 25.00% (good).

Reverse: a $1,000 total balance is 10% overall, so paying $1,500 gets there; a $3,000 total balance is 30% overall, leaving $500 of headroom before crossing 30%. A $25,000 total limit would be 10% at this balance, so $15,000 more limit is needed; $8,333.33 would be 30%, already under it. Card A at 10% is a $500.00 balance.

Every branch, checked

Card A balance $500: Card A is $500 ÷ $5,000 × 100 = 10.00% (good, at the band edge), and the overall figure is ($500 + $1,000) ÷ $10,000 × 100 = 15.00% (good). A $1,000 smaller balance on Card A moves it from fair to good.

Card A balance $2,500: Card A is $2,500 ÷ $5,000 × 100 = 50.00% (poor), and the overall figure is ($2,500 + $1,000) ÷ $10,000 × 100 = 35.00% (fair). Half the limit used is the poor band.

Card A balance $4,000: Card A is $4,000 ÷ $5,000 × 100 = 80.00% (very poor), and the overall figure is ($4,000 + $1,000) ÷ $10,000 × 100 = 50.00% (poor). Four-fifths of the limit used is very poor on the card and poor overall.

Card B balance $0: Card B is $0 ÷ $5,000 × 100 = 0.00% (excellent), and the overall figure is ($1,500 + $0) ÷ $10,000 × 100 = 15.00% (good). A zero balance is the excellent band.

Card B limit $10,000: Card B is $1,000 ÷ $10,000 × 100 = 10.00% (good), and the overall figure is $2,500 ÷ ($5,000 + $10,000) × 100 = 16.67% (good). Doubling the limit on Card B cuts the overall figure from 25.00% to 16.67%.

Card A limit $10,000: Card A is $1,500 ÷ $10,000 × 100 = 15.00% (good), and the overall figure is $2,500 ÷ ($10,000 + $5,000) × 100 = 16.67% (good). Doubling the limit on the high card moves it from fair to good.

Pay $1,500: the payment goes to Card A first, because Card A is the highest-utilization card at 30.00% against Card B at 20.00%. Card A goes to $0, Card B stays at $1,000, and the overall figure is $1,000 ÷ $10,000 × 100 = 10.00% (good, at the band edge).

Pay $2,000: the payment clears Card A to $0 for $1,500, then $500 goes to Card B, taking it to $500. The overall figure is $500 ÷ $10,000 × 100 = 5.00% (excellent). The same $2,000 spread evenly would leave both cards part-paid and neither at zero, which is why the order matters.

Reverse — the balance and the limit for a target: a $1,000 total balance is 10% overall on a $10,000 limit, so paying $1,500 gets there ($2,500 − $1,000). A $3,000 total balance is 30% overall, so there is $500 of headroom before crossing 30% ($3,000 − $2,500). A $25,000 total limit would be 10% at a $2,500 balance ($2,500 ÷ 0.10), so $15,000 more limit is needed ($25,000 − $10,000). A $8,333.33 total limit would be 30% ($2,500 ÷ 0.30), which is already under the $10,000 limit, so the overall figure is already under 30%. Card A at 10% is 10% × $5,000 = a $500.00 balance.

Edges: a $0 balance is 0.00% (excellent); a balance equal to the limit is 100.00% (very poor); a balance over the limit is over 100%, and the result flags it as over your limit.

What the defaults assume

The model assumes two cards, the balances and limits you enter, and an extra payment that goes to the highest-utilization card first, then the other card. It assumes the balances and limits stay fixed while you work the numbers, and it leaves out payment history, statement timing, and the rest of a FICO score — amounts owed are roughly 30% of a FICO score, as general guidance, not a guarantee. The bands are under 10% excellent, 10 to 29% good, 30 to 49% fair, 50 to 74% poor, and 75% or more very poor. Rounding convention: percentages are shown to two decimals, money is rounded to cents, and all figures are computed from unrounded values, rounded only for display.

Output · formula · meaning

Who uses this

• The cardholder at 25.00%: they learn the overall figure is 25.00% (good), but Card A is 30.00% (fair) — so they know Card A is the card to attack first, and they check the $1,500 payment case at 10.00% before paying Card B.
• The cardholder chasing excellent: they learn paying $2,000 takes the overall figure to 5.00% (excellent) — so they know the payment for the top band, and they check the $25,000 limit case at 10.00% before asking for more limit instead.
• The cardholder with one maxed card: they learn Card A at $4,000 is 80.00% (very poor) even though the overall figure is 50.00% (poor) — so they know the per-card figure counts on its own, and they check the $500 balance case at 10.00% before spreading a payment evenly.
• The cardholder watching the 30% line: they learn there is $500 of headroom before crossing 30% — so they know a small new charge crosses it, and they check the $3,000 balance case at 30% before charging more.

Accuracy & limitations

The math is exact for the numbers you enter: the per-card utilization is the balance divided by the limit times 100, the overall figure is the total balance divided by the total limit times 100, and the band follows the percentage. What the model cannot do is read your statements for you: check the balances and limits on the statements, because a $4,000 balance and a $500 balance give very different answers. It covers two cards and the balance and limit math only, and it leaves out payment history, statement timing, and the rest of a FICO score — amounts owed are roughly 30% of a FICO score, as general guidance, not a guarantee. For paying the balance off, see credit card payoff calculator; for lowering the ratio step by step, see how to lower your credit utilization.