Scope 3 Emissions Calculator Formula
Understand the math behind the scope 3 emissions calculator. Each variable explained with a worked example.
Formulas Used
Total Scope 3 Emissions
total_out = total_scope3Purchased Goods Share
goods_pct = purchased_goods / total_scope3 * 100Travel & Commute Share
travel_pct = (business_travel + employee_commuting) / total_scope3 * 100Waste Share
waste_pct = waste_disposal / total_scope3 * 100Variables
| Variable | Description | Default |
|---|---|---|
purchased_goods | Purchased Goods & Services(metric tons CO2e) | 200 |
business_travel | Business Travel(metric tons CO2e) | 50 |
employee_commuting | Employee Commuting(metric tons CO2e) | 80 |
waste_disposal | Waste Disposal(metric tons CO2e) | 20 |
total_scope3 | Derived value= purchased_goods + business_travel + employee_commuting + waste_disposal | calculated |
How It Works
How to Calculate Scope 3 Emissions
Scope 3 covers all indirect emissions in your value chain not included in Scope 2. These are typically the largest portion of a company's total footprint.
15 Categories of Scope 3
Upstream: purchased goods/services, capital goods, fuel/energy activities, transportation, waste, business travel, employee commuting, leased assets.
Downstream: product transportation, processing, use of sold products, end-of-life treatment, leased assets, franchises, investments.
Formula
Total Scope 3 = Sum of all category emissions
Worked Example
A mid-size company with estimated Scope 3 across four main categories.
- 01Purchased goods: 200 metric tons CO2e
- 02Business travel: 50 metric tons CO2e
- 03Employee commuting: 80 metric tons CO2e
- 04Waste disposal: 20 metric tons CO2e
- 05Total Scope 3: 200 + 50 + 80 + 20 = 350 metric tons CO2e
Ready to run the numbers?
Open Scope 3 Emissions Calculator