Aluminum Extrusion & Profile Manufacturing worked example

Aluminum Extrusion Ratio Practicality Calculator with billet cross-sectional area of 71 in²: a worked example

What does the result look like when billet cross-sectional area reaches 71 in²? The full calculation is worked below with real intermediate numbers. a profile designer or die engineer needs an early check on whether a profile may be difficult to push or quote

The inputs for this scenario

  • Billet cross-sectional area: 71 in² (raised for this scenario; the documented default is 28.3)
  • Profile cross-sectional area: 0.42 in² (unchanged)
  • Area unit conversion factor: 1 x (unchanged)
  • Die complexity / tongue-ratio multiplier: 1.25 x (unchanged)

Working through the calculation

  • Applying the documented formula (Base billet-to-profile area ratio = billet cross-sectional area × inverse profile flow-area factor × area conversion factor) to the inputs above produces each figure below.
  • At this operating point the engine returns 37.28 ratio index for estimated extrusion ratio severity index, the number this scenario is built around.
  • At this operating point the engine returns 29.82 ratio for base billet-to-profile area ratio.
  • At this operating point the engine returns 1.25 x for die complexity multiplier.
  • At this operating point the engine returns 29.82 ratio for billet area × inverse profile area.

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 151% above the baseline at 37.28 ratio index.
  • A figure at this level is achievable when billet cross-sectional area is genuinely sustained, not just peaked for a shift. The complexity multiplier is an empirical judgment factor, not a physics constant — it approximates how a thin tongue or intricate hollow raises effective difficulty, so calibrate it against your own press history.

Results at a glance

  • Estimated extrusion ratio severity index: 37.28 ratio index (headline result)
  • Base billet-to-profile area ratio: 29.82 ratio
  • Die complexity multiplier: 1.25 x
  • Billet area × inverse profile area: 29.82 ratio

Run it with your numbers

  • Every input above is editable in the live Aluminum Extrusion Ratio Practicality Calculator calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.