Cross Multiplication Calculator

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Choose the variable you want to find. Leave the corresponding field blank or at zero - it will be ignored.
Top-left value of the proportion A/B = C/D.
Bottom-left value. Cannot be zero when B is a known value.
Top-right value of the proportion A/B = C/D.
Bottom-right value. Cannot be zero when D is a known value.
Missing value
8

The solved unknown in the proportion A/B = C/D

Cross-product A x D24
Cross-product B x C24
Left ratio A/B0.75
Right ratio C/D0.75
Proportion confirmedYes - both cross-products are equal
A x D24
B x C24

D = 8

  • The solved value is D = 8. Both cross-products equal 24, confirming the proportion holds.
  • The common ratio A/B = C/D = 0.75, equivalent to 75%. This means for every unit of the denominator there are 0.75 units of the numerator.
  • Cross-products: A x D = 24 and B x C = 24. When these are equal, the proportion is valid.

Next stepSubstitute all four values back into A/B = C/D and confirm both sides give the same decimal to double-check.

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