Forging Billet Weight and Yield Calculator
Billet weight sets material cost for every forging. Too little bar and the die does not fill. Too much and you pay for metal that becomes flash. This calculator sizes the billet from the finished weight and your loss percentages.
Your numbers
Forging weight before machining
Flash is usually higher on complex shapes
Oxide lost during heating, often about 1 to 3 percent
Your results
Planning estimate. Loss percentages depend on die design, lubricant, heating method and alloy. Confirm against first article weights.
Billet weight and net cost vs flash loss
Sweeps Flash loss from 4 to 30, holding your other inputs fixed.
Compare estimated and actual material use
Optional: a short review of how estimates could be checked against ERP consumption.
Optional. The tool and every export work without this. No spam.
How to use this calculator
Enter the forging weight (not the machined part weight), then your flash, scale and butt or punch-out losses as a percent of the billet. Add bar cost and the scrap value of flash. The calculator returns billet weight, yield and net material cost per piece. The chart sweeps flash loss from 4 to 30 percent so you can see how die design changes cost.
The formula
If losses are percentages of the billet, the finished weight equals the billet times one minus the total loss. So billet weight equals finished weight divided by that factor. Yield is finished weight divided by billet. Scale is oxide lost to the atmosphere with no scrap value. Flash and butt are recovered as scrap and credited at the scrap price. For steel, you can convert a billet volume to weight with a density near 7850 kg per cubic meter.
Reading the result
Net cost per finished kg shows the real cost of getting metal into the part, including the loss. Compare two die designs by changing flash loss. Reducing flash by a few points saves bar on every piece, which matters at volume. Also check the billet against available bar sizes, since you will round to a standard diameter and a cut length.
Common mistakes
Mixing loss bases is common: some teams state flash as a percent of the finished part, not the billet. Use one base consistently. Also avoid ignoring saw kerf and the end pieces left when cutting bar, which add to material usage beyond what is calculated here.
Frequently Asked Questions
What flash loss is typical?
It varies with part shape and die design. Simple compact shapes may lose several percent, while complex forgings can lose a much larger share. Use your own history from weighed first articles.
Does this work for aluminum or titanium?
The math is the same for any alloy. Scale loss is lower for aluminum and titanium needs special handling, so enter your own percentages and metal prices.
Why is scale loss not recovered?
Scale is oxide that flakes off during heating and forging and is swept away, so it carries no scrap credit, though some shops do collect it.
Does it include saw kerf?
No. Add kerf and end piece loss to your bar planning separately, or fold it into the butt loss percentage if you want it included.
If your estimators and planners work from ERP costs and routings, Netray can help compare estimated and actual material usage on your own servers.
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