Ratio to Percentage Calculator

Enter a ratio such as 3:8 to calculate 37.5% and the equivalent decimal.

Ratio A

Ratio B

Percentage

37.5%

Decimal 0.375

3 ÷ 8 × 100 = 37.5%

Calculation breakdown & reusable snapshots

WebToolArc mirrors the current inputs and visible result so you can copy or save a local snapshot without changing the calculator’s original controls.

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Formula / rule: For a:b, percentage share of a relative to b is a ÷ b × 100 when that is the intended comparison.
Interpretation: Ratios can encode different meanings, so confirm which term is the reference.

Recent saved snapshots

Formula and interpretation

For a:b, percentage share of a relative to b is a ÷ b × 100 when that is the intended comparison.

Ratios can encode different meanings, so confirm which term is the reference.

Repeat-use support

The v11.09 snapshot panel stores only the snapshots you explicitly save in this browser using localStorage; nothing is uploaded to WebToolArc.