How does the calculator convert lb CO2e/MWh to kg CO2e/kWh?

By international definition (NIST Handbook 44), 1 avoirdupois pound equals exactly 0.45359237 kg. Since 1 MWh = 1,000 kWh, 1 lb/MWh = 0.45359237 / 1,000 = 0.00045359237 kg/kWh. Entering 1,000 lb/MWh normalizes to 0.453592 kg CO2e/kWh.

What is the difference between Location-based and Market-based Scope 2 accounting?

Under GHG Protocol Scope 2 Guidance, the location-based method reflects average emissions intensity of grids on which energy consumption occurs (using regional grid averages such as EPA eGRID). The market-based method reflects emissions from electricity that companies have purposefully chosen (via supplier contracts, EACs/RECs, or green power tariffs).

Why does this tool require entering an emission factor instead of using static country defaults?

Grid emission intensities change annually as generation mixes evolve. Static undated country presets frequently lead to severe accounting inaccuracies and compliance failure. Always reference current primary datasets such as EPA eGRID (US) or DESNZ/DEFRA (UK).

What is the exact conversion between metric tonnes and US short tons?

One metric tonne (t) is exactly 1,000 kg (approx. 2,204.62 lb). One US short ton is exactly 2,000 lb (approx. 907.185 kg). Both are computed directly to ensure compliance across US customary and international ESG reporting formats.

Electricity Carbon Calculator

Calculate Scope 2 emissions from electricity usage (kWh) using user-specified emission factors in kg CO2e/kWh or lb CO2e/MWh with dual-unit kg/lb outputs.

Electricity Input & Emission Factor

Electricity Consumption (kWh)

Utility bill or meter consumption (max 1,000,000 kWh).

Time Period

Monthly Annual

Emission Factor

Accepts verified regional or supplier factors up to 10 kg CO2e/kWh normalized.

GHG Protocol Scope 2 Method

Factor Source & Year (Audit record)

Enter electricity usage and factor above, then click Calculate to generate your auditable greenhouse gas calculation.

Estimated Electricity Emissions

0 kg CO2e / 0 lb CO2e

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Normalized Factor

Calculation Audit Trail

Daily Average

0 kg CO2e / 0 lb

Daily rate

Annualized Total

0 kg CO2e / 0 lb

Annual rate

Factual Standards & Reporting Boundaries

Standard NIST Unit Equivalencies: 1 international avoirdupois pound (lb) = 0.45359237 kg exactly. 1 metric tonne (t) = 1,000 kg (2,204.6226 lb). 1 US short ton = 2,000 lb (907.18474 kg). 1 MWh = 1,000 kWh.

Scope 2 Dual Reporting: The GHG Protocol requires reporting both Location-based (regional average generation mix) and Market-based (contractual instruments including RECs, GOs, or utility green tariffs) figures. Neither method should be conflated.

Avoided Generation vs Inventory: Total-output emission rates (e.g. standard EPA eGRID subregion tables) measure corporate inventory footprint. Avoided-generation assessments (such as installing rooftop solar or energy efficiency retrofits) typically utilize non-baseload marginal rates.

Primary Source Datasets: Retrieve updated factors directly from EPA eGRID (US), UK DESNZ/DEFRA (UK), or your utility supplier.

Data Integrity Note: All math is computed entirely within your browser. Calculations do not transmit proprietary facility or utility data across networks.

Summary

Calculate Scope 2 emissions from electricity usage (kWh) using user-specified emission factors in kg CO2e/kWh or lb CO2e/MWh with dual-unit kg/lb outputs.

How it works

Enter electricity consumption in kilowatt-hours (kWh) for a monthly or annual billing period.
Enter an authoritative emission factor in either kg CO2e/kWh or lb CO2e/MWh (e.g. from EPA eGRID or UK DESNZ/DEFRA).
Select the reporting methodology (Location-based grid average, Market-based supplier/contract, or Other).
Optionally document the factor source publication and reporting year for audit records.
View instant dual-unit emissions across metric (kg, tonnes) and US customary (lb, short tons) scales.
Copy the formatted audit calculation directly to clipboard for ESG and corporate reporting.

Use cases

Calculate organizational Scope 2 greenhouse gas inventories for ESG compliance.
Convert EPA eGRID subregion output rates (published in lb CO2e/MWh) without external unit conversions.
Evaluate corporate electricity carbon footprint across location-based and market-based accounting methods.
Audit household or small business electric utility bill carbon impacts with exportable math.

Frequently Asked Questions

Last updated: 2026-09-22 · Reviewed by Nham Vu