Cross-Multiplication Calculator
Quickly find an unknown value with cross-multiplication.
Result87,5
Cross product: (35 × 250) / 100 = 87,5.
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How is this result calculated?
Cross-multiplication calculates the unknown value with X = B × C / A.
This page is intentionally concise: it is built to run the proportional calculation as quickly as possible.
Frequently asked questions
How is this different from the rule of three?+
It is the same mathematical idea, presented here in a more direct way for immediate cross-product calculation.
Which value is being solved?+
The calculator solves X in the relationship A corresponds to B, therefore C corresponds to X.
Why can't A be equal to 0?+
The formula divides by A. Division by 0 is impossible, so that value is rejected.
Can this be used for percentages?+
Yes, cross-multiplication is often useful for finding a proportional value or a percentage.