Ratio Calculator — Simplify, Scale and Compare Ratios

Use this free ratio calculator to simplify a ratio to its lowest terms, scale a ratio to any total or compare two ratios to check if they are equivalent. Includes visual split bars and equivalent ratio tables.

Ratio Calculator

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How to Use the Ratio Calculator

Choose your mode — Simplify Ratio, Scale a Ratio or Compare Ratios. Enter your values and click Calculate for instant results with visual breakdown.

How Are Ratios Simplified?

A ratio is simplified by dividing both numbers by their Greatest Common Divisor (GCD). For example 8:12 — the GCD is 4 — simplifies to 2:3. This is the simplest form where both numbers are the smallest whole numbers that maintain the same relationship.

Common Uses for Ratios

Ratios are used in recipes (2 parts flour to 1 part butter), map scales (1:50,000), financial analysis (debt to equity ratios), mixing solutions, photography (aspect ratios like 16:9), and statistics.

FAQs

What is a ratio?

A ratio compares two quantities showing their relationship. Written as A:B it shows how much of one thing there is relative to another. For example 2:3 means for every 2 of A there are 3 of B.

How do you simplify a ratio?

Divide both numbers by their Greatest Common Divisor. For example 6:9 — GCD is 3 — simplifies to 2:3.

What is scaling a ratio?

Scaling a ratio means applying the same ratio to a different total. For example a 2:3 ratio scaled to 100 gives 40 and 60 — the same relationship but adding up to 100.

Is this calculator free?

Yes completely free with no sign-up needed.