Math

Ratio & Proportion Calculator

Ratio calculator that simplifies A:B and solves A/B = C/X with decimal and cross-product results.

Simplify a two-part ratio or solve a proportion in the form A ÷ B = C ÷ X. The solver uses cross multiplication to find the missing fourth value.

Ratios can compare quantities only when their units are compatible or intentionally related.

Frequently asked questions

How is X solved?

From A/B = C/X, cross multiplication gives A×X = B×C, so X = B×C/A.

Can the ratio contain decimals?

Yes. Decimal inputs are supported, though automatic integer simplification applies only when A and B are integers.

Can B be zero?

No. A ratio used as division cannot have a zero second term.