Foundry & Forging worked example

Riser Yield Impact at 12% target riser weight share: a worked example

This worked example runs the riser yield impact numbers for a tougher week than the baseline: 12% target riser weight share instead of the typical 16%. Calculate how much riser weight affects casting yield for a mold or casting family.

The inputs for this scenario

Riser and feeder weight: 950 lb (held at the documented default)
Total pour weight: 6,200 lb (held at the documented default)
Target riser weight share: 12 % (the input this scenario stresses; the baseline uses 16)

Working through the calculation

The calculation starts from the formula this tool documents: Riser Yield Impact rate = riser and feeder weight ÷ total pour weight × 100.
Riser Yield Impact rate works out to 15.32 % at these inputs, and this is the headline figure for the scenario.
Riser Yield Impact gap to target works out to -3.32 points at these inputs.
Riser and feeder weight works out to 950 count at these inputs.
Total pour weight works out to 6,200 count at these inputs.

How this compares with the baseline

Against the tool's baseline example, where target riser weight share sits at 16% and the headline result is 15.32 %, this scenario lands almost exactly on the baseline at 15.32 %.
Use it when reviewing a rigging design or methoding simulation to judge whether feeder metal is in a reasonable range for the alloy and section thickness. A result at this level usually justifies acting on the stressed input before touching anything else, because every other figure in the table is downstream of it.

Results at a glance

Riser Yield Impact rate: 15.32 % (headline result)
Riser Yield Impact gap to target: -3.32 points
Riser and feeder weight: 950 count
Total pour weight: 6,200 count

Run it with your numbers

To rerun this with your own numbers, open the live Riser Yield Impact calculator, set target riser weight share to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.