Our buyer wants the emissions of the raw materials we buy. Where do we start?

List your raw materials by tonnes bought in a year. Ask your top suppliers for a figure per tonne; for the rest, use a published database factor and label it as secondary data. Multiply each by tonnes. This is your Scope 3 purchased goods, and the buyer sees it inside your product figure.

Steps

1. Rank materials by tonnes and spend.
2. Request supplier figures for the top few.
3. Use database factors for the rest, with the source named.
4. Add up by product using your bill of materials.

Be clear

Tell the buyer which share uses supplier data and which uses database factors. Buyers increasingly ask for that split.

What Senseible does here

Senseible reads bills, fuel invoices and production records into dated, fingerprinted records, so the figure you send a buyer can be traced to its documents.

• Primary data share
• Buyer asks for my Scope 3
• Which factor database for India

Sources: GHG Protocol Corporate Value Chain (Scope 3) Standard, GHG Protocol Product Standard, ISO 14067:2018, Carbon footprint of products (iso.org)

Last reviewed 2026-10-22.