Cross Multiply client-side ?
How to use Cross MultiplyCross-multiplication, also called the rule of three, finds a fourth value from three known values that stay proportional. You enter three numbers in the relation A is to B as C is to X, and the tool computes X by multiplying across the diagonal and dividing. It is the fastest way to solve a proportion without writing the equation by hand.
It is handy every day to scale a recipe, convert a price per kilo, resize a drawing to the right scale or recompute a dosage. The whole calculation runs in your browser, so no data is sent to any server.
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Cross-multiplication, also called the rule of three, finds a fourth value from three known values that stay proportional. You enter three numbers in the relation A is to B as C is to X, and the tool computes X by multiplying across the diagonal and dividing. It is the fastest way to solve a proportion without writing the equation by hand. It is handy every day to scale a recipe, convert a price per kilo, resize a drawing to the right scale or recompute a dosage. The whole calculation runs in your browser, so no data is sent to any server.
Calculate cross multiplication instantly.
How to use Cross Multiply
Cross-multiplication, also called the rule of three, finds a fourth value from three known values that stay proportional. You enter three numbers in the relation A is to B as C is to X, and the tool computes X by multiplying across the diagonal and dividing. It is the fastest way to solve a proportion without writing the equation by hand. It is handy every day to scale a recipe, convert a price per kilo, resize a drawing to the right scale or recompute a dosage. The whole calculation runs in your browser, so no data is sent to any server.
Frequently asked questions
How does cross-multiplication work?
For the proportion A/B = C/X, you multiply B by C and divide by A. The missing value X comes from crossing the known terms diagonally.
Is it the same as the rule of three?
Yes, they are two names for the same operation. Cross-multiplication is just the visual way of laying out the rule of three.
Can I solve for any of the four terms?
Yes, the tool finds whichever term is missing, no matter its position, as long as the other three values are filled in.
Are my numbers sent to a server?
No, everything is computed locally in your browser. Nothing is stored or transmitted.