Online Calculators > Math Calculators > Ratio Calculator
Ratio Calculator
Ratio Calculator  calculate the ratio of any two numbers. Online ratio calculator to find the missing value in a set of ratio or numbers. Solve ratio problems A:B = C:D.
Ratio Formula
Following is the ratio formula that shows how to calculate ratio of two numbers, A:B = C:D.
To find D, when A, B and C are givin, we use
D = B*C/A
For example, to find the ratio for 3:4 = 6:D,
D = 4*6/3 = 24/3 = 8 or 3:4 = 6:8
To find C when A, B and D are given.
C = D*A/B
For example, to find ratio for 2:5 = C:10,
C = 10*2/5 = 4 or 2:5 = 4:10


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