Scope 3 Emissions in Your Supply Chain: MSME Calculator Guide

Published 2026-03-24.

Scope 3 emissions are often the largest part of a company's total carbon footprint but are the hardest to measure. GHG Protocol Scope 3 categories most relevant to MSMEs: Category 1 (Purchased Goods and Services), usually the largest, Category 4 (Upstream Transportation), Category 5 (Waste), and Category 7 (Employee Commuting). Calculation approaches: Spend-based method (easiest), Activity-based method (more accurate), Hybrid approach. Country-specific considerations: Emission factors vary significantly, for example for steel made with different production routes and grids in different countries. Upload supplier invoices with line items. The system matches HSN/HS codes to emission factor databases, applies country-specific grid and transport factors, and generates category-wise Scope 3 breakdowns. EU CSDDD will require the largest companies to carry out human rights and environmental due diligence across their chains of activities. Large brands are pushing Scope 3 measurement to tier-2 and tier-3 suppliers.