The share of materials that leave the cycle without being reused or recycled (offcuts, rejects, unsold goods) measured as a percentage. The lower, the better.
Why this indicator
Losses are the material that escapes the cycle: they cost twice, at purchase and again at disposal. Reducing them is the most direct circularity lever.
The scale targets under 5% in the comfort zone.
Where to find the figure
In the internal tracking of material flows: material balance, offcut and reject rates per workstation. This figure is probably one of your production manager's obsessions, go and ask them.