Ratio Calculator

Simplify, scale, and compare ratios. Convert ratios to percentages and handle three-way ratios.

Result

Fill in the fields above, then press Calculate.

A ratio calculator simplifies, scales, and compares ratios, converts ratios to percentages, and handles three-way ratios (A:B:C) across multiple modes.

Select a mode: simplify a ratio, scale it, compare two ratios, convert a ratio to a percentage, or work with three-way ratios (A:B:C). Enter the values requested for that mode. Click Calculate to see the result.

Examples

Simplify 12:18

GCD(12,18)=6 → 2:3

Scale 2:3, New A=10

10:15

Frequently Asked Questions

What is the relationship between GCD and LCM?
GCD(a,b) × LCM(a,b) = |a×b|.
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Quick Tips

  • •Use the simplify mode to reduce ratios to their lowest terms before comparing.
  • •Double-check your inputs — small errors in numbers lead to large errors in results.
  • •Convert a ratio to a percentage to quickly understand proportional shares.