Ratio & Proportion Calculator

Simplify ratios, solve proportions for missing values, and split totals

Mode

Term A

Term B

Calculation Result

Simplified Ratio

2 : 3

Decimal: 0.6667

Term A

Term B

Decimal Equiv

0.6667

Simplify an existing ratio A : B to lowest integers.

Or find missing value X in the proportion A : B = C : X.

Ratio Proportion Rule

A : B = C : D ⟹ D = (B × C) / A

Cross-multiplication preserves proportional equivalence across scale dimensions.

Simplification and missing term calculation.

• GCD(24, 36) = 12 ⟹ 24/12 : 36/12 = 2 : 3

• For 4 : 5 = 12 : X ⟹ X = (5 × 12) / 4 = 15

Simplified ratio is 2 : 3. Missing term X = 15.

An aspect ratio like 16:9 means for every 16 units of width, there are 9 units of height.

Calculate percent of values, percent changes, and ratio proportions instantly

Add, subtract, multiply, divide fractions and convert to mixed numbers and decimals

Calculate mean, median, mode, range, variance, and standard deviation for datasets