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Ratio Calculator

Simplify a ratio, or solve the proportion a:b = c:x for the missing value — recipes, scale models, mixing.

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Simplify a ratio

Simplified—

Solve proportion: a : b = c : x

Value of x—

Ratios and Proportions

A ratio compares quantities; simplify by dividing both sides by their GCD (12:18 → 2:3). A proportion a:b = c:x solves with cross multiplication: x = b × c ÷ a. That is the math behind scaling a recipe, mixing fuel/oil, map scales and resizing designs.

Frequently Asked Questions

A recipe for 4 people uses 300 g flour — how much for 7?

4:300 = 7:x → x = 300 × 7 ÷ 4 = 525 g. Enter it exactly like that in the proportion solver.

How do I mix 1:50 two-stroke fuel?

Per liter (1000 ml) of gasoline: 1000 ÷ 50 = 20 ml of oil. For 5 L, 100 ml.

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