Guide · Carbon Accounting
Scope 3 Categories: All 15 Explained with Examples
Scope 3 emissions are 70–90% of most companies' carbon footprint and the hardest part of any inventory. The GHG Protocol Corporate Value Chain Standard splits them into 15 categories. This guide takes you through every one — what's in, what's out, how to calculate it, a real worked example, the trap most companies fall into, and which industries should care most.
TL;DR
- 15 categories: 1–8 upstream (your suppliers, inputs), 9–15 downstream (sold products, investments).
- 3–5 categories usually dominate. Do a materiality screen first — don't try to perfect all 15.
- Method ladder: supplier-specific > hybrid > activity-based > spend-based. Climb it where it matters.
- The classic mistake: double-counting Category 1 with Categories 3–4. Read the GHG Protocol Technical Guidance.
What are Scope 3 emissions?
Scope 3 emissions are all indirect greenhouse gas emissions across a company's value chain — both the production of inputs you buy (upstream) and the use of products you sell (downstream). They sit alongside Scope 1 (direct emissions from owned operations) and Scope 2 (purchased electricity, steam, heat and cooling).
Under the GHG Protocol Corporate Value Chain (Scope 3) Standard, Scope 3 is divided into 15 categories. CSRD/ESRS E1, ISSB IFRS S2, CDP and SBTi all reference this same structure, so getting it right once carries you through every major reporting framework.
All 15 categories at a glance
Click any category to jump to its detailed breakdown.
Upstream (your value chain ↑)
Downstream (your products in use ↓)
Which categories matter most for your industry
Don't try to perfect all 15. Most companies have three or four dominant categories. Here's the rough map — use it as a starting point, then run your own materiality screen.
| Industry | Dominant Scope 3 categories | Typical share of Scope 3 |
|---|---|---|
| Manufacturing | Cat 1 (purchased goods) · Cat 11 (use of products) | 60–80% |
| Automotive | Cat 11 (use of vehicles) · Cat 1 (steel, aluminium, batteries) | 80–95% |
| Software / Tech | Cat 1 (cloud, hardware) · Cat 2 (data centres) · Cat 7 (commute) | 60–80% |
| Retail / Consumer goods | Cat 1 (product sourcing) · Cat 11 (product use) · Cat 12 (packaging EoL) | 85–95% |
| Financial services / Banks | Cat 15 (financed emissions) | >95% |
| Asset managers / PE | Cat 15 (investments) | >98% |
| Real estate | Cat 13 (leased assets) · Cat 1 (construction materials, embodied carbon) | 70–90% |
| Logistics / Freight | Cat 4 (upstream) · Cat 9 (downstream) · Cat 1 (vehicles, fuel) | 80–95% |
| Food & beverage | Cat 1 (agricultural inputs) · Cat 4 (cold chain) · Cat 12 (packaging) | 80–95% |
| Oil & Gas | Cat 11 (combustion of sold fuels) | >90% |
| Energy & Utilities | Cat 3 (T&D losses) · Cat 11 (use of sold energy) | 60–80% |
| Professional services | Cat 1 (purchased services) · Cat 6 (travel) · Cat 7 (commute) | 60–80% |
Upstream categories (1–8)
Everything that happens before a product reaches you. Suppliers, inputs, energy upstream of your meter, transport into your sites, employee commuting and travel.
Purchased goods and services
Emissions from the production of products and services your company buys — everything from raw materials and components to professional services and SaaS subscriptions.
How to calculate: Supplier-specific (best) → hybrid (mix supplier & secondary data) → activity-based (kg of steel × emission factor) → spend-based (£ spent × industry factor). Walk up the ladder where it matters most.
Pitfall: Often the largest Scope 3 category, so worth getting right. Spend-based factors hide real reduction opportunities — once you've done one, climb to activity-based for your top 20 spend lines.
Capital goods
Emissions from producing capital assets you've purchased — buildings, machinery, vehicles, IT hardware, equipment. The embodied carbon of the things you own.
How to calculate: Same ladder as Category 1. For buildings, use embodied carbon factors (kg CO2e per m² by building type and structure). For IT hardware, use Product Carbon Footprints (PCFs) from manufacturers.
Pitfall: Easy to forget completely. Then a single year's capital investment can spike Scope 3 dramatically. Don't be surprised; flag it in narrative.
Fuel- and energy-related activities
Emissions from producing the fuels and electricity you buy — the upstream piece that doesn't fall into Scope 1 or 2. Includes 'well-to-tank' fuel emissions, electricity T&D losses, and trading of energy.
How to calculate: Apply WTT and T&D loss factors to Scope 1 / Scope 2 consumption volumes. UK BEIS publishes annual factors; US EPA & DEFRA do the same.
Pitfall: The double-count trap. If you used spend-based for Category 1 fuel purchases, you've already implicitly included WTT — adding Cat 3 on top double-counts. Activity-based Cat 1 and a separate Cat 3 is fine; spend-based Cat 1 and a separate Cat 3 is not.
Upstream transportation and distribution
Emissions from moving purchased goods from suppliers to your sites, plus any third-party logistics services you paid for.
How to calculate: Tonne-kilometres × mode-specific emissions factor (kg CO2e per tonne-km for road / sea / air / rail). Activity-based factors are widely available from GLEC / SmartWay / BEIS.
Pitfall: Same double-count risk as Cat 3 if Cat 1 was spend-based. Also: lots of teams forget the warehousing component — pure mileage isn't the full story.
Waste generated in operations
Emissions from disposal and treatment of waste produced by your own facilities. Landfill methane, incineration CO2, wastewater treatment.
How to calculate: Mass of waste by stream × treatment-specific factor. Recycling typically has a low net factor (sometimes negative on credit basis); landfill has the highest.
Pitfall: Smaller than people expect for most companies (often <1% of Scope 3). Don't over-invest in measurement here unless you're in heavy industry or chemicals.
Business travel
Emissions from employees travelling for business in vehicles your company doesn't own: flights, rail, hire cars, taxis. Hotel nights typically included.
How to calculate: Flights: passenger-km × class-and-haul factor (short / long, economy / business / first). Hotels: nights × country-specific factor (DEFRA publishes). Hire car: actual mileage.
Pitfall: Travel data lives in TMC systems, expense reports and credit card feeds. Get the integration right once and this category becomes easy. The RFI factor (whether to apply, typically 1.7–2.0×) is a methodology choice you should declare.
Employee commuting
Emissions from employees travelling between home and their work location. Increasingly includes home-working energy use since 2020.
How to calculate: Survey employees on commute pattern, mode, distance — usually quarterly or annually. Then headcount × average commute × mode factor. WFH: hours WFH × country-grid kWh per hour assumption.
Pitfall: Survey fatigue. Sample carefully and document assumptions. WFH is a relatively new add — check current GHG Protocol guidance on Homeworking before including.
Upstream leased assets
Emissions from operating assets your company leases (you're the lessee) that aren't already in your Scope 1 or 2.
How to calculate: Floor area × building energy intensity factor; or vehicle miles × emissions factor. The judgement call is the consolidation approach (operational control vs equity vs financial control) — declare it.
Pitfall: Easy to either double-count with Scope 2 or miss entirely. Establish your consolidation approach first, then assign every leased asset to either Scope 1/2 or Cat 8.
Downstream categories (9–15)
Everything that happens to your products after they leave you. Distribution, processing, customer use, end-of-life, plus assets you lease to others and your investments.
Downstream transportation and distribution
Emissions from transporting sold products to customers and through distribution channels, where the customer (not you) is paying for the logistics.
How to calculate: Tonne-km × mode factor, same as Cat 4. Often estimated based on average product weight, average customer location, and standard delivery routes.
Pitfall: Boundary with Cat 4 is the most-asked question in Scope 3. Rule: who pays for the freight? Pays you / paid by you = Cat 4. Pays customer / handled by reseller = Cat 9.
Processing of sold products
Emissions from further processing of intermediate products you sell — e.g. you sell steel coil, your customer rolls and stamps it into car panels. Their processing emissions are yours under Cat 10.
How to calculate: Volume of intermediate sold × typical downstream processing energy × grid factor. Often heavily assumption-driven for upstream suppliers.
Pitfall: Almost no real data; estimate heavily and document. Sometimes excluded if your products are mostly finished goods.
Use of sold products
Emissions from customers using your products over their lifetime. Massive for energy-using goods (cars, white goods, software) and combusted products (fuels, lubricants).
How to calculate: Units sold × lifetime use × per-unit use emissions. For cars: km driven over life × gCO2/km. For appliances: kWh/year × lifetime years × grid factor. For fuels: tonne sold × combustion factor.
Pitfall: Often the dominant category but completely ignored by companies that don't sell hardware. If you sell electrified products, this is the category to obsess over.
End-of-life treatment of sold products
Emissions from the eventual disposal of the products you sell. Landfill, incineration, recycling, composting — all attributed to the original seller.
How to calculate: Mass of product sold × expected disposal mix × treatment-specific factor. Packaging is a major sub-component — track separately if material.
Pitfall: Often confused with Cat 5 (your own operational waste). Cat 5 is what you throw out from your sites. Cat 12 is what customers throw out at the end of using your products.
Downstream leased assets
Emissions from operating assets your company owns and leases to others. The flip side of Cat 8.
How to calculate: Floor area × tenant energy intensity, or asset operating hours × emissions factor. For commercial real estate, GRESB asset-level energy data is the standard source.
Pitfall: Real estate's dominant Scope 3 category. Don't confuse with embodied carbon (Cat 1 / Cat 2).
Franchises
Emissions from operating franchise locations not consolidated into Scope 1 / 2 under your chosen consolidation approach.
How to calculate: Per-outlet energy estimate × number of franchises × grid factor. McDonald's, Subway, KFC and similar franchisors lead reporting practice here.
Pitfall: Only applies if you franchise. Many companies skip it correctly. If you do franchise, the data has to come from franchisees — build the supplier engagement workflow.
Investments
Emissions associated with your company's investments — equity, debt, project finance, managed assets. The 'financed emissions' of banks, asset managers and private equity firms.
How to calculate: Follow PCAF (Partnership for Carbon Accounting Financials) methodology. Investee company emissions × (your investment ÷ investee enterprise value). PCAF defines six asset-class methodologies (listed equity, business loans, project finance, commercial real estate, mortgages, motor vehicle loans).
Pitfall: Cat 15 is essentially the entire Scope 3 footprint of financial institutions. PCAF data quality scores (1=best, 5=worst) should be disclosed alongside the numbers — transparency about methodology beats false precision.
The calculation methods ladder
Four methods. Climb the ladder where the category is material; use the bottom rung for categories that aren't.
Spend-based
£ spent × industry-average kg CO2e per £.
Use when: first-year inventory, immaterial categories, no other data available.
Activity-based (average)
Physical units (kg, kWh, tonne-km) × product-class average factor.
Use when: you know physical volumes but not supplier-specific data.
Hybrid
Supplier-specific for top-spend lines, average data for the rest.
Use when: you've engaged your biggest suppliers but can't get them all.
Supplier-specific
Actual product- and supplier-level emissions data from each vendor.
Use when: the category is material and assurance / SBTi rigour is needed.
Six common Scope 3 mistakes
- Double-counting Categories 1, 3 and 4. Spend-based Cat 1 already includes upstream fuel/energy and transport. Adding Cat 3 and Cat 4 separately overstates the footprint.
- Treating Cat 5 (operational waste) as Cat 12 (sold-product EoL). Cat 5 is what your sites throw away. Cat 12 is what customers throw away after using your products. Different denominators, different factors.
- Ignoring Category 11 because you "don't sell hardware". Software, services and SaaS still have a use phase if customers run them on infrastructure you sold or specified.
- Spend-based forever. First inventory year, fine. Year three, you're being lazy. SBTi and CSRD assurance increasingly demand activity-based for material categories.
- RFI for flights left unstated. Multiplying short-haul air emissions by 1.7–2.0× (radiative forcing) is a methodology choice that materially changes Cat 6. Declare it.
- Annualising capital goods. Cat 2 is reported in the year of purchase, full amount, no amortisation. Many teams instinctively spread it over the asset's life — that's not GHG Protocol-compliant.
Materiality screening: where to focus
Before climbing the methods ladder, screen which categories actually matter. A one-week screening exercise saves months of effort. Three steps:
- Apply spend-based factors to all 15 categories. Don't overthink — even imprecise spend-based numbers reveal proportions.
- Rank by absolute tCO2e. The top 3–5 categories typically cover 80%+ of total Scope 3.
- Invest measurement effort proportionally. Activity-based for top categories. Hybrid for next tier. Stay spend-based for the long tail.
SBTi rule of thumb: If Scope 3 is >40% of your total footprint, SBTi requires a Scope 3 reduction target. Most companies cross that threshold easily once they include Cat 1 and Cat 11.
FAQs
How many Scope 3 categories are there?
Fifteen, defined by the GHG Protocol Corporate Value Chain (Scope 3) Standard. Categories 1–8 are upstream (suppliers and inputs); categories 9–15 are downstream (sold products and investments).
Which Scope 3 categories are typically largest?
It depends on the industry. Category 1 (Purchased goods and services) is largest for most companies. Category 11 (Use of sold products) dominates for energy-using product makers — cars, appliances, software. Category 15 (Investments) is largest for banks and asset managers. Category 4 (Upstream transport) is largest for logistics and distribution.
Do I have to report all 15 Scope 3 categories?
Under CSRD/ESRS E1 and ISSB IFRS S2, you must report every material category and explain any you exclude. Under the GHG Protocol Standard itself, reporting is voluntary but should be complete or justified. In practice, do a materiality screen first — usually 3–5 categories dominate.
What's the difference between spend-based and activity-based Scope 3?
Spend-based multiplies pounds/dollars spent by an industry-average emissions factor. Quick to do, low accuracy. Activity-based uses physical units — kg, kWh, tonnes-km — multiplied by a unit-level emissions factor. More accurate. Supplier-specific is the gold standard.
What's the most common Scope 3 mistake?
Double-counting between Category 1 and Categories 3–4. Most companies who use spend-based factors for Category 1 are already implicitly including transport and energy. Adding Categories 3 and 4 on top is double-count.
How long does a Scope 3 inventory take to build?
A first-cut spend-based inventory across all 15 categories takes 2–4 weeks. Moving to activity-based and supplier-specific data is the multi-year journey. Most CSRD-ready companies are in year 2 or 3 of that journey.
Does ESG:ONE calculate all 15 Scope 3 categories?
Yes. We support all 15 GHG Protocol categories with the appropriate methods per category. The library includes 140,000+ emissions factors including DEFRA, EPA, Ecoinvent, EXIOBASE and BEIS.
Stop chasing Scope 3 in spreadsheets.
ESG:ONE automates collection across all 15 categories — supplier portals, AI extraction from utility bills and invoices, 140,000+ emissions factors, full audit trail. Live in 3 weeks.
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