Result
Buy this much raw material
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This calculation is for informational purposes only and does not replace advice from a qualified professional. Formulas and rates may not fit your exact situation — double-check the figures before making decisions.
How it is calculated
Purchase = net weight needed ÷ (1 − waste ÷ 100). This is the reverse of the usual gross-to-net calculation: that one goes from a purchase to a net weight, this one goes from the required net weight back to the purchase.
Waste amount = purchase − net weight needed. Yield = 100% − waste percentage — handy for checking against norms that are often stated as a yield rather than a waste rate.
Purchase cost is calculated on the full purchased weight, including the part that becomes waste — that's how the real cost of the net product is formed, not by the raw price per kilogram alone.