How to Calculate Scope 3 Emissions in India: A Step-by-Step Guide for Manufacturers

Scope 3 emissions are the largest and most complex part of any company’s carbon footprint — and for most Indian manufacturers, they remain either completely unaccounted or grossly underestimated. SEBI’s BRSR framework, CDP disclosure requirements, and increasingly, customer and investor ESG questionnaires, are all pushing Indian companies to quantify their Scope 3 emissions. This guide gives you a practical, India-specific approach to doing it right.

What Are Scope 3 Emissions?

The GHG Protocol divides emissions into three scopes:

• Scope 1: Direct emissions from sources you own or control (furnaces, boilers, company vehicles, process emissions)
• Scope 2: Indirect emissions from purchased electricity and heat
• Scope 3: All other indirect emissions in your value chain — upstream and downstream

For a typical Indian steel or cement manufacturer, Scope 3 emissions can be 3 to 10 times larger than Scope 1 and 2 combined. For a pharma or textile company, Scope 3 upstream (raw material extraction and processing) often dominates the footprint.

The 15 Scope 3 Categories — Which Ones Apply to You?

The GHG Protocol defines 15 Scope 3 categories. Not all are material for every company. The first step is a materiality screening to identify which categories are significant for your sector.

Category	Relevant For	Typically Material?
Cat 1: Purchased goods & services	All manufacturers	Yes — often largest category
Cat 3: Fuel & energy related	Energy-intensive industries	Yes
Cat 4: Upstream transportation	Companies with complex supply chains	Yes
Cat 5: Waste generated in operations	Manufacturing, pharma	Medium
Cat 6: Business travel	IT, consulting, services	Medium
Cat 7: Employee commuting	Large workforce companies	Medium
Cat 11: Use of sold products	Auto, FMCG, electronics	High for consumer products
Cat 12: End-of-life treatment	Packaging-heavy industries	Medium

Step-by-Step: How to Calculate Scope 3 Emissions in India

Step 1: Define Your Reporting Boundary

Decide whether you are using the operational control, financial control, or equity share approach for your organisational boundary. This must be consistent with your Scope 1 and 2 reporting to avoid double-counting or omissions.

Step 2: Identify Material Categories

Run a spend-based screening using your procurement data. Categories where spend exceeds 1% of total procurement are typically material. For Indian manufacturers, Category 1 (purchased raw materials) and Category 4 (upstream logistics) are almost always significant.

Step 3: Choose Your Calculation Method

The GHG Protocol allows three approaches for Scope 3:

• Spend-based method: Multiply procurement spend (in rupees) by an economic emissions factor. Best for initial screening. Less accurate. Use USEEIO or Exiobase databases.
• Average data method: Multiply physical quantities (kg of raw material) by emission factors per unit. More accurate. Uses Ecoinvent, IPCC, or supplier-specific EPDs.
• Supplier-specific method: Use actual emissions data provided by your Tier 1 suppliers. Most accurate but requires supplier engagement.

For Indian companies doing Scope 3 for the first time, we recommend starting with the average data method for Category 1 using Ecoinvent 3.x with Indian geography datasets where available, and the spend-based method for lower-materiality categories.

Step 4: Collect Activity Data

Activity data is where most Indian companies struggle. Here is what you need by category:

• Cat 1 (Purchased goods): Quantity (in kg/MT) of each raw material purchased from your ERP or procurement system
• Cat 4 (Upstream transport): Tonne-kilometres (tkm) — weight of goods multiplied by distance travelled, by mode (road, rail, sea, air)
• Cat 6 (Business travel): Flight itineraries, train bookings, hotel nights
• Cat 7 (Employee commuting): Employee survey data on home-to-office distance and transport mode

Step 5: Apply Emission Factors

For India-specific Scope 3 calculations, use these primary sources:

• Electricity (Cat 3): CEA Grid Emission Factor — currently 0.716 kgCO₂e/kWh (FY 2022-23)
• Road transport (Cat 4): IPCC 2006 Guidelines or UNFCCC CDM methodologies
• Materials: Ecoinvent 3.10 with Indian datasets, or IPCC Tier 2 factors
• Business flights: DESNZ (UK DEFRA) emission factors, which include radiative forcing

Common Mistakes Indian Companies Make in Scope 3 Accounting

• Using global average emission factors when India-specific data exists — this can over or underestimate by 30-40%
• Excluding Category 1 because supplier data is hard to get — this is the largest category for most manufacturers
• Inconsistent base year — Scope 3 base year must match Scope 1 and 2
• Double-counting between Category 3 (fuel and energy activities) and Scope 1 and 2
• Not documenting assumptions — critical for BRSR Core assurance and CDP disclosure

What Does a Completed Scope 3 Inventory Look Like?

A properly completed Scope 3 inventory includes:

• A category-level emissions table showing tCO₂e per category
• Data quality scoring for each category (following GHG Protocol DQI framework)
• Calculation methodology notes — which databases, which emission factors, why
• Exclusions log — what was excluded and why it is not material
• Uncertainty analysis if assurance is intended

How Planetary Plus Approaches Scope 3 for Indian Manufacturers

We have completed Scope 3 inventories for clients across cement, steel, auto components, and textiles — sectors where the supply chain complexity is high and Indian-specific emission factors matter enormously.

Our process starts with a materiality assessment using your actual procurement spend data, identifies the top 3-5 material categories, and builds calculation models in OpenLCA using Ecoinvent 3.x. Every emission factor, data source, and assumption is documented in a methodology note that satisfies both BRSR Core assurance requirements and CDP questionnaire standards.

If you are starting your Scope 3 journey or need to improve an existing inventory before assurance, speak with our team.