Calculate similarity ratios from corresponding sides, scale lengths, areas, volumes, coordinates, maps, and image sizes with unit conversions.

Similarity Ratio Calculator
Enter two corresponding side lengths to calculate the similarity ratio, scale factor, perimeter ratio, area ratio, and volume ratio.
Results
Similarity Ratio A:B
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Scale Factor A to B
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Decimal Ratio A/B
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Inverse Ratio B:A
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Perimeter Ratio
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Area Ratio
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Volume Ratio
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Interpretation
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Related Calculators

Similarity Ratio Formula

The following formula is used to calculate the Similarity Ratio. 

SR = S1 / S2
  • Where SR is the Similarity Ratio ( )
  • S1 is the side length in the first triangle 
  • S2 is the side length in the second triangle 

To calculate the similarity ratio, divide the side length of the first triangle by the side length of the second triangle.

How to Calculate Similarity Ratio?

The following example problems outline how to calculate Similarity Ratio.

Example Problem #1:

  1. First, determine the side length in the first triangle.
    • The side length in the first triangle is given as: 6.
  2. Next, determine the side length in the second triangle.
    • The side length in the second triangle is provided as: 10.
  3. Finally, calculate the Similarity Ratio using the equation above: 

SR = S1 / S2

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

SR = 6 / 10 = .60 ( )

Example Problem #2: 

For this problem, the variables required are provided below:

side length in the first triangle = 7

side length in the second triangle = 12

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

SR = S1 / S2 = ?