Aluminum Extrusion & Profile Manufacturing worked example

Aluminum Extrusion Ratio Practicality Calculator with billet cross-sectional area of 14 in²: a worked example

Suppose billet cross-sectional area falls to 14 in². This page works the full calculation at that level so you can see exactly which result moves and by how much. Estimate an extrusion ratio severity index from billet area, profile area factor, conversion, and die complexity for a proposed aluminum profile.

The inputs for this scenario

  • Billet cross-sectional area: 14 in² (the input this scenario stresses; the baseline uses 28.3)
  • Profile cross-sectional area: 0.42 in² (held at the documented default)
  • Area unit conversion factor: 1 x (held at the documented default)
  • Die complexity / tongue-ratio multiplier: 1.25 x (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Base billet-to-profile area ratio = billet cross-sectional area × inverse profile flow-area factor × area conversion factor.
  • Estimated extrusion ratio severity index works out to 7.35 ratio index at these inputs, and this is the headline figure for the scenario.
  • Base billet-to-profile area ratio works out to 5.88 ratio at these inputs.
  • Die complexity multiplier works out to 1.25 x at these inputs.
  • Billet area × inverse profile area works out to 5.88 ratio at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where billet cross-sectional area sits at 28.3 in² and the headline result is 14.86 ratio index, this scenario comes in 50.53% below the baseline at 7.35 ratio index.
  • Computes the base billet-to-profile area ratio, then multiplies by a die-complexity or tongue-ratio factor to produce an extrusion-ratio severity index. When the numbers land here, the stressed input is the lever to work; the walkthrough above shows exactly how much each output recovers as it climbs back toward the baseline.

Results at a glance

  • Estimated extrusion ratio severity index: 7.35 ratio index (headline result)
  • Base billet-to-profile area ratio: 5.88 ratio
  • Die complexity multiplier: 1.25 x
  • Billet area × inverse profile area: 5.88 ratio

Run it with your numbers

  • To rerun this with your own numbers, open the live Aluminum Extrusion Ratio Practicality Calculator calculator, set billet cross-sectional area to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.