Material Waste

Free Material Waste calculator with clear step-by-step results.

About Material Waste

Separates gross waste from net waste, since recovered offcuts re-enter the process and should not be counted as loss. The total cost of waste is then both the purchase value of the material that never reached the product and the fee to dispose of it - the second cost being the one usually overlooked.

Formulas

Net waste

Net waste = ordered - in product - recovered for reuse

Total cost

Cost = net waste x material price + net waste tonnes x disposal cost

Worked example

With the default values below, Material Waste returns Net waste rate of 11.00%. Change any input above and every figure here is recalculated in your browser.

Inputs used

Material orderedminimum 0 kg: 5,000 kg
Material that ends up in the productminimum 0 kg: 4,100 kg
Offcuts recovered for reuseminimum 0 kg: 350 kg
Material priceminimum 0 $/kg: 2.4 $/kg
Disposal costminimum 0 $/t: 95 $/t

Results

Net waste rate: 11.00% %
Material yield into product: 82.00% %
Value of the material wasted: $1,320.00
Total cost of waste including disposal: $1,372.25

Step by step

1Values used
2Net waste
3Total cost
4Net waste rate= 11.00 %
5Material yield into product= 82.00 %
6Value of the material wasted= $1,320.00
7Total cost of waste including disposal= $1,372.25

Assumptions and limits

The result is derived only from the 5 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax or compounding frequency into account.
Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

Why does waste cost twice?

You pay to buy the material and again to take it away. On low-value bulk material with a high gate fee, the disposal side can approach the purchase cost.

What yield should I aim for?

It depends entirely on process - sheet nesting can exceed 90%, while machining from billet may be under 40%. Track the trend rather than the absolute number.