About the Scrap Rate Calculator
Scrap (reject) rate: scrapped units as a percentage of total units produced, and the cost of scrap.
Also known as: reject rate, waste rate, scrap percentage, reject-rate.
How to use this calculator
- Enter scrapped units, total units produced.
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Open “Step-by-step” to see how the answer was worked out.
- Use Copy result or Share to save the answer or send a link with your inputs.
Formula
Scrap rate = Scrapped units ÷ Total units produced × 100
Worked example
Using the values pre-filled in the calculator above:
- Scrapped units = 45
- Total units produced = 1,500
the calculator returns:
- Scrap rate: 3%
Working
Scrap rate = 45 ÷ 1,500 × 100 = 3%