A buyer wants a carbon figure on every invoice line. How do I do that?

Work out kg CO2e per unit for each product once, from your yearly Scope 1 and 2 and the inputs each product uses, then multiply by the quantity on each line. Update the per-unit figure when your inventory changes, and state the period and method on the invoice.

Steps

1. Build a yearly per-unit figure per product, with a stated allocation rule.
2. Store it as a product attribute in your billing system.
3. Print quantity x per-unit figure on each line, with the basis year.

Keep it defensible

• Do not recalculate per invoice from that month's bills; seasonal swings confuse buyers.
• Say whether the figure is cradle to gate.
• Keep the workings ready for review.

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.

• Buyer asks for a PCF
• One dataset for several buyers
• Split by product line

Sources: GHG Protocol standards, including the Product Standard, GHG Protocol Corporate Standard

Last reviewed 2026-10-22.