Proportion vs Ratio

When to use each in English, with meaning, register, and examples.

 ProportionRatio
MeaningA part or share of something in relation to the whole.The relationship between two numbers showing how much of one there is compared to the other.
CEFR levelB2C1
Part of speechnounnoun
Usage notesUse 'proportion' to discuss ratios or relationships between different amounts. Often appropriate in mathematics, statistics, and discussions about fairness. Avoid in casual conversation when not discussing specific comparisons.Used in mathematics, sciences, and discussions about comparisons. Avoid in casual conversation unless the context is clear.

Frequently asked questions: Proportion vs Ratio

What's the difference between "Proportion" and "Ratio"?

"Proportion" means: A part or share of something in relation to the whole. "Ratio" means: The relationship between two numbers showing how much of one there is compared to the other.

When should I use "Proportion" and "Ratio"?

They can all be used in everyday English.

Are "Proportion" and "Ratio" the same CEFR level?

"Proportion" is at B2, "Ratio" is at C1 on the CEFR scale.

Related comparisons