How do I estimate the carbon footprint of one spectacle frame?
Weigh the frame by material, usually acetate, injected plastic or metal, and apply a material factor per kilogram. Add the factory's electricity and fuel per frame, and packaging. For lenses, do the same separately, since glass and plastic lenses differ.
Per frame
- Material weight: acetate, nylon, steel, titanium.
- Factory energy divided by frames made.
- Case, cloth and box.
Standard
ISO 14067 sets out how to build and report a product footprint; state the boundary, cradle to gate or wider.
What Senseible does here
Senseible turns your fuel, power and material invoices into a dated, sourced activity record, the starting point for a per-unit footprint.
Sources: ISO 14067:2018, carbon footprint of products (iso.org), GHG Protocol Corporate Standard
Last reviewed 2026-10-22.