Calculate the ratio between two measurements in mm, cm, m, inches or feet, simplify an aspect ratio, find a drawing scale or split a mix by parts.

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Measurement Ratio Formula

The following formula is used to calculate the Measurement Ratio. 

MR = M1 / M2
  • Where MR is the Measurement Ratio
  • M1 is the first length, converted to the same unit as M2 
  • M2 is the second length, converted to the same unit as M1 

To calculate the measurement ratio, first convert both lengths to the same unit, then divide the first by the second. A decimal ratio r is shown as first : second = r : 1. Aspect mode reduces the entered decimal dimensions without rounding them first; drawing scale uses drawing : real = 1 : n, including n below 1 for enlargement. Mix mode divides an additive total volume in the stated A : B proportions.

How to Calculate Measurement Ratio?

The following example problems outline how to calculate Measurement Ratio.

Example Problem #1:

  1. First, determine the first measurement (in).
    • The first measurement (in) is given as 3.
  2. Next, determine the second measurement (in).
    • The second measurement (in) is provided as 6.
  3. Finally, calculate the Measurement Ratio using the equation above: 

MR = M1 / M2

The values given above are inserted into the equation below and the solution is calculated:

MR = 3 /6 = .50

Example Problem #2: 

For this problem, the variables required are provided below:

first measurement (in) = 7

second measurement (in) = 8

Test your knowledge using the equation and check your answer with the calculator above.

MR = M1 / M2 = ?