✖️ Cross Multiply Calculator
Solve proportions using cross multiplication. Find the missing value in a/b = c/d.
What Is Cross Multiplication?
Cross multiplication is a method for solving proportions. Given a/b = c/d, cross multiplying gives a × d = b × c. This allows you to solve for any unknown variable when the other three are known.
When to Use Cross Multiplication
Cross multiplication is useful for solving proportion problems in cooking (scaling recipes), map reading (scale conversions), unit conversions, similar triangles, and any situation involving equivalent ratios. It is one of the most frequently used techniques in algebra.
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