Electricity CO₂ Calculator Scope 2
Estimate electricity-related CO₂ or CO₂e from energy use and an emission factor, compare Scope 2 scenarios, and inspect the calculation without leaving the page.
Results
Meter Mode
Electricity Bill Mode
| Month | Electricity (kWh) | EF (kg/kWh) | Emissions (kg) | |
|---|---|---|---|---|
| January | — | |||
| February | — | |||
| March | — |
Dual Reporting Location-Based vs Market-Based
Location-Based
Market-Based
Scenarios
Advanced Results
Monthly Emissions
Electricity vs CO₂
Reference — Unit Conversions
| Quantity | Conversion |
|---|---|
| 1 kWh | 1,000 Wh |
| 1 MWh | 1,000 kWh |
| 1 GWh | 1,000 MWh |
| 1 kg | 1,000 g |
| 1 metric tonne | 1,000 kg |
| 1 lb | 0.453592 kg |
| Factor Type | Purpose | Accounting Use |
|---|---|---|
| Grid Average | Avg grid emissions | Location-Based |
| Supplier-Specific | Product/provider factor | Market-Based |
| Residual Mix | After contractual claims | Market-Based |
| Custom | User-verified factor | Both |
Scope Classification
| Energy Source | GHG Accounting Context |
|---|---|
| Purchased electricity | Scope 2 |
| On-site fuel combustion | Scope 1 |
| Upstream electricity-related emissions | May fall under Scope 3 |
How to Use This Calculator
- Enter electricity consumption and select the unit (Wh, kWh, MWh, GWh).
- Enter the emission factor and select its unit (g, kg, t, lb per kWh or MWh).
- Choose CO₂ or CO₂e to match your factor.
- Click Calculate Emissions to see results.
- Expand Calculation Breakdown to verify each step.
- Use Advanced Mode for Scope 2, meter/bill entry, dual reporting, and scenarios.
- For formal Scope 2 reporting, verify the factor and method with authoritative sources.
This tool estimates electricity-related CO₂/CO₂e emissions. Always verify emission factors against current, authoritative datasets.
Important Limitations
This calculator estimates emissions from activity data and an emission factor. It does not automatically account for:
- Transmission/distribution losses (unless included in the factor)
- Upstream fuel lifecycle emissions
- Construction or embodied carbon
- Scope 1 or full Scope 3 categories
- Carbon offsets or removals
- Full life-cycle assessment
Results depend on factor quality and methodology. Always consult the factor source and reporting standard.
References
GHG Protocol Scope 2 Guidance — Definitions, location-based and market-based methods, dual reporting.
U.S. EPA eGRID — U.S. regional electricity emission factors.
National Government Conversion Factors — Authoritative datasets for various jurisdictions.
IPCC — Greenhouse gas accounting concepts and global warming potentials.
Built-in factors are illustrative. For production use, always verify with current, authoritative sources.
Variables
| Symbol | Quantity | Unit |
|---|---|---|
| CO2 Emissions | Carbon dioxide emissions | kg CO2 |
| Electricity Used | Electricity consumed | kWh |
| Emission Factor | Grid carbon intensity | kg CO2/kWh |
What it means
The carbon footprint from electricity consumption is the amount of CO₂ equivalent emitted to produce that electricity, based on the emission factor of the grid (kg CO₂/kWh). The emission factor depends on the energy mix (coal, gas, renewables). This calculation is used by individuals, businesses, and governments to estimate carbon emissions, to track reduction targets, and to evaluate the benefits of energy efficiency measures. Emission factors are published by environmental agencies. Example: A household uses 12,000 kWh/year. If the grid emission factor is 0.4 kg CO₂/kWh, the annual CO₂ emission is 12,000 × 0.4 = 4,800 kg = 4.8 tonnes. By switching to renewable energy, this can be reduced. This calculation helps in setting and measuring carbon reduction goals.
Worked example
Carbon Footprint from Electricity – Two Examples
Real‑World| Parameter | Value |
|---|---|
| Electricity | 500 kWh |
| Emission factor | 0.4 kg CO₂/kWh |
| Parameter | Value |
|---|---|
| Electricity | 1,000 kWh |
| Emission factor | 0.35 kg CO₂/kWh |
Common mistakes
- Electricity used: In kWh – use actual consumption, not rated capacity.
- Emission factor: Depends on the electricity grid mix (kg CO₂ per kWh). Typical values: 0.3‑0.8 kg/kWh for coal‑heavy grids, 0.1‑0.3 for cleaner grids.
- Units: CO₂ emissions in kg or tonnes.
- Life‑cycle: This is combustion‑only CO₂; full carbon footprint includes upstream (extraction, transport) – use a life‑cycle factor for complete accounting.
- Renewable sources: Some grids include renewables – use a factor that reflects the actual mix.
Applications
Carbon footprint from electricity use is calculated by multiplying the electricity consumption (kWh) by the emission factor (kg CO₂ per kWh) of the grid. This estimates the greenhouse gas emissions associated with purchased electricity. Companies, governments, and individuals use this to account for Scope 2 emissions, to set reduction targets, and to choose renewable energy sources. The emission factor varies by region and energy mix; using time‑specific factors allows for more accurate reporting. By calculating this footprint, organisations can identify opportunities for energy efficiency and renewable energy procurement, contributing to climate mitigation goals.
- Corporate greenhouse gas inventory (Scope 2 emissions)
- Carbon footprint assessment for products and services (cradle‑to‑gate)
- Evaluation of energy efficiency projects and renewable energy investments
- Green building certifications (LEED, BREEAM) and sustainability reporting
- National and regional carbon accounting for policy development
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