Ratio Calculator

Simplify ratios and solve for missing values in proportions.

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Simplify Ratio

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Solve Proportion (A:B = C:D)

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Frequently Asked Questions

How do I simplify a ratio?

Divide both numbers by their greatest common divisor (GCD). For example, 8:12 simplifies to 2:3.

What is a proportion?

A proportion states that two ratios are equal: A/B = C/D. If you know three values, you can solve for the fourth.