Gaskets, Seals, O-Rings & Elastomer Components worked example

Seal Groove Fill with seal cross-section area of 3.54 mm²: a worked example

Here is what the math looks like when conditions slip. We hold every other input steady and drop seal cross-section area to 3.54 mm², then walk the calculation through step by step. Estimate seal groove fill by comparing the O-ring or seal cross-section area with the available gland or groove area.

The inputs for this scenario

  • Seal cross-section area: 3.54 mm² (the input this scenario stresses; the baseline uses 7.07)
  • Available groove area: 10.2 mm² (held at the documented default)
  • Percent conversion factor: 100 x (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Seal groove fill = seal cross-section area ÷ available groove area × percent conversion factor.
  • Seal groove fill works out to 34.71 % at these inputs, and this is the headline figure for the scenario.
  • Seal-to-groove area ratio works out to 0.35 value at these inputs.
  • Percent conversion factor works out to 100 x at these inputs.
  • Available groove area works out to 10.2 value at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where seal cross-section area sits at 7.07 mm² and the headline result is 69.31 %, this scenario comes in 49.93% below the baseline at 34.71 %.
  • The practical read: the gap between this scenario and the baseline is entirely attributable to seal cross-section area, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. Fill alone does not account for thermal swell, fluid absorption, or compression set; a gland that passes on area can still overfill in service after the seal swells.

Results at a glance

  • Seal groove fill: 34.71 % (headline result)
  • Seal-to-groove area ratio: 0.35 value
  • Percent conversion factor: 100 x
  • Available groove area: 10.2 value

Run it with your numbers

  • To rerun this with your own numbers, open the live Seal Groove Fill calculator, set seal cross-section area to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.