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Ratio to Percentage Converter

Simplify ratios, solve proportions A : B = C : x, scale ratios by any factor and convert them to fractions, decimals and percentages — with every step shown.

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Parsing values
Scaling decimals to integers
Computing exact result
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Result

This page opens the ratio calculator in convert mode with the percentage output selected: a ratio A : B is divided out and multiplied by 100, so 3 : 4 becomes 75% and 1 : 8 becomes 12.5%. The division is exact, and repeating decimals are truncated at ten places and marked as approximate.

Each conversion also produces the simplified fraction and the plain decimal value on separate result cards, with the full working — simplification, division, multiplication by 100 — listed underneath.

Percentages make ratios comparable: a 3 : 4 win ratio and a 6 : 8 one are obviously the same once both read 75%. The converter is handy for test scores, solution concentrations, screen and sensor shapes, and any report where a plain percent communicates faster than a ratio.

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Accepted Formats & Rules

  • Four modes: simplify a ratio, solve a proportion, scale by a factor, and convert a ratio.
  • Decimal inputs are handled exactly by scaling both sides to whole numbers first.
  • Converts any ratio to a simplified fraction, a decimal and a percentage at once.

Key Benefits

✓ Every answer comes with the full step-by-step working, so you can follow the method and check homework.
✓ Exact integer arithmetic under the hood — decimal inputs like 2.5 : 1 are scaled to whole numbers, never rounded.
✓ Runs entirely in your browser: no sign-up, no uploads, instant results on any device.

Use Cases

  • • Simplify a ratio like 25:10 or 2.5:1 to its lowest terms with the GCD steps shown, ready to paste into homework.
  • • Solve a proportion such as 3:4 = 9:x by cross-multiplication to scale a recipe, a map distance or a price exactly.
  • • Convert a ratio to a fraction, decimal and percentage at once to compare test scores, mixes or screen shapes.