How to Do Calculations for O Ring Size


An O-ring is a type of seal situated in the groove that connects two parts, and compresses when they are pushed together. It is used for a wide variety of manufacturing purposes, such as connections between two pipes or in a household blender. The shape of an O-ring is determined by two dimensions, the inner diameter of the ring (how far it is across the inside of the ring) and the cross-section diameter (how thick the ring itself is). Depending on the application, O-rings require different levels of compression and stretch. These levels can be used to find the required inner diameter and cross-section diameter.

Things You'll Need

  • eFunda O-Ring Calculator
  • Specified input levels for bore and groove diameter and tolerance
  • Specified levels for O-ring minimum and maximum compression
  • Specified levels for O-ring cross-section diameter tolerance

Calculate O-Ring Size

  • Visit and click "Calculators" on the right-hand side of the top menu bar.

  • Scroll down to the second section, "Engineering Design Aids" and select "O-Ring Calculator."

  • Enter the specified levels for each item (e.g. "Groove diameter," "bore tolerance," etc.) into each box and specify the measurement unit.

  • Click "Calculate." The required inner diameter and cross-section diameter for your O-ring will be displayed.

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