Tool · free

Inventory waste cost calculator

Enter purchase quantity, unit cost, waste rate and selling price. See wasted units, cost loss and opportunity loss instantly.

Stock and waste

Purchase quantity

Unit purchase cost

$

Waste rate

%

Selling price

$

Wasted units = purchase x waste%. Opportunity = wasted units x selling price.

Waste is not only trash; it is unsold revenue. Skipping the rate as 'a little spoilage' hides monthly loss.

This tool derives wasted units from purchases, then shows cost loss at unit cost and opportunity loss at selling price.

Wasted units = purchase quantity x waste rate. Cost loss = wasted units x unit cost. Opportunity loss = wasted units x selling price.

Cost loss is inventory damage. Opportunity loss is the sales that never happened. A high waste rate points to portioning, storage and ordering.

This tool is for information only.

How do I estimate waste rate?

Period waste quantity / purchase quantity. If unknown, start around 3-10 percent and refine with measurement.

Why is opportunity loss larger than cost?

Selling price is usually above cost; each wasted unit removes both cost and sales potential.

Does this include portion trim?

Yes. You can set the rate near spoilage, trim and portion variance combined.

Can I email myself the result?

Yes. Use Email me the result with your name, email and phone and we will send the summary. Our team may also contact you if helpful.

Keep sales and stock movement in one flow. Try it free.