Cross Multiply Calculator

Cross multiply calculator calculates unknown values from the other 3 known values of an equivalent fraction.

Cross Multiply Calculator
Solve for D

D = B x C/A
/
= /
Solve for C

C = A x D/B
/
= /
Solve for B

B = A x D/C
/
= /
Solve for A

A = B x C/D
/
= /

Cross Multiply Formula


If   A / B = C / D

Then

A x D = B x C

Use this formula, we can solve any unknown value from the other 3 known values.

For example,

to solve for D with values A of 2, B of 3, and C of 9.

D = B x C/A
   = 3 x 9/2
   =13.5

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