Proportion Calculator

Proportion Calculator - calculate proportion problems quickly and easily. Online proportions calculator is used to solve proportion problems and find the missing value in a proportion. Enter 3 numbers and leave 1 empty to solve for the unknown number.

Proportion Formula

Following is the proportion formula that shows how to calculate proportion.

To solve for A, B, C or D when the other 3 are given
A = B*C/D
B = A*D/C
C = A*D/B
D = B*C/A