Greenhouse Gas Inventory Calculator

Scope 1, 2, and 3 emissions for organizational GHG inventory.

Inputs

Natural gas (MMBtu/yr)

Diesel fuel (gal/yr)

Electricity (MWh/yr)

Air travel (passenger-miles/yr)

Employee commuting (miles/yr)

Number of employees

Tab to move between fields

Results

Total CO₂e (metric tons/yr)

161.7

Scope 1 — Direct (tons)36.7

Scope 2 — Electricity (tons)77.6

Scope 3 — Value chain (tons)47.4

Per employee (tons)3.2

Offset cost @ $30/ton ($)$4,851.00

Scope 1 share (%)22.7

Scope 2 share (%)48

How to Use This Calculator

Enter Natural gas (MMBtu/yr), Diesel fuel (gal/yr), and Electricity (MWh/yr).
Set Air travel (passenger-miles/yr), Employee commuting (miles/yr), and Number of employees.
Review the Total CO₂e (metric tons/yr) result.
Use Scope 1 — Direct (tons) and Scope 2 — Electricity (tons) to inform your decision.

How the result changes with Electricity (MWh/yr)

Electricity (MWh/yr)	Total CO₂e (metric tons/yr)
100,000	38,884.1
350,000	135,884.1
650,000	252,284.1
900,000	349,284.1

What each input means

Natural gas (MMBtu/yr): Annual natural gas consumption in million BTU.
Diesel fuel (gal/yr): Annual diesel consumption for vehicles/equipment (gallons).
Electricity (MWh/yr): Annual purchased electricity in megawatt-hours.
Air travel (passenger-miles/yr): Total employee air travel in passenger-miles per year.
Employee commuting (miles/yr): Total employee commuting vehicle-miles per year.
Number of employees: Total headcount for per-employee calculations.

What each result means

Total CO₂e (metric tons/yr): Total greenhouse gas emissions across all scopes.
Scope 1 — Direct (tons): Direct emissions from fuel combustion on-site.
Scope 2 — Electricity (tons): Indirect emissions from purchased electricity.
Scope 3 — Value chain (tons): Emissions from business travel and employee commuting.
Per employee (tons): Total emissions divided by number of employees.
Offset cost @ $30/ton ($): Estimated cost to offset all emissions at $30 per metric ton.
Scope 1 share (%): Percentage of total emissions from Scope 1.
Scope 2 share (%): Percentage of total emissions from Scope 2.

How this is calculated

Worked example, using the default values

Identify Input Parameters
4 parameters
Natural gas (MMBtu/yr) = 500, Diesel fuel (gal/yr) = 1000, Electricity (MWh/yr) = 200, Air travel (passenger-miles/yr) = 50000 = 6 input(s) provided
Calculate Total CO₂e
Total CO₂e = scope1 + scope2 + scope3
161.7 = 161.7
Calculate Scope 1 — Direct
Scope 1 — Direct = natGasCO2 + dieselCO2
36.7 = 36.7
Calculate Scope 2 — Electricity
Scope 2 — Electricity = electricityMwh * 1000 * 0.388 / 1000
77.6 = 77.6

Engine last updated July 26, 2026. Checked against 2 independently-derived tests — how we verify calculators.

The questions that sit next to this one — chosen by subject, including calculators filed under a different category.

Air Quality

Vehicle Emissions Calculator

Annual emissions from vehicle type, age, and mileage.

Environmental & Sustainability

Carbon Footprint Calculator

Estimate your annual carbon footprint from driving, electricity, heating, and air travel. Compare to US and world averages.

Green Building

Embodied Carbon Calculator

Calculate A1-A3 embodied carbon (kgCO2e) for your building's structural and envelope materials — concrete, steel, timber, masonry, glass, and insulation.

Dairy

Dairy Carbon Footprint

Calculate dairy operation carbon footprint in CO2 equivalents per gallon of milk, including enteric fermentation, manure, energy, and feed emissions.