Corporate GHG Calculator

Inputs

Organization name

Reporting period

Employees

Revenue (optional)

Scope 1 — Direct emissions

Stationary, mobile, and refrigerants.

Natural gas use (kWh)

EF (kgCO2e/kWh)

Diesel fuel (liters)

EF (kgCO2e/liter)

Gasoline fuel (liters)

EF (kgCO2e/liter)

Refrigerant leakage (kg)

Refrigerant type

Custom GWP (only if “Other” selected)

Scope 2 — Purchased electricity

Location-based and market-based options.

Electricity consumption (kWh)

Renewable share (%)

Electricity EF (location-based)

kgCO2e/kWh

Use grid average for your location.

Electricity EF (market-based)

kgCO2e/kWh

Use supplier factors or contract-based values.

Scope 3 — Value chain estimates

Travel, commuting, waste, and spend-based goods.

Flights (passenger-km)

EF (kgCO2e/km)

Hotel nights

EF (kgCO2e/night)

Employee commuting (km)

EF (kgCO2e/km)

Waste disposed (kg)

EF (kgCO2e/kg)

Purchased goods & services (spend)

EF (kgCO2e per spend unit)

Use an IO or supplier factor when available.

Downloads use your current inputs.

Example data table

Source	Activity	Emission factor	Output
Electricity	120,000 kWh	0.45 kgCO2e/kWh	54,000 kgCO2e
Diesel	8,000 L	2.68 kgCO2e/L	21,440 kgCO2e
Flights	35,000 km	0.18 kgCO2e/km	6,300 kgCO2e

Replace the example values with your operational data before exporting.

Formula used

Activity-based emissions: kgCO2e = Activity × Emission factor
Electricity renewables adjustment: Non‑renewable kWh = kWh × (1 − Renewable%)
Refrigerants: kgCO2e = Refrigerant leaked (kg) × GWP
Unit conversion: tCO2e = kgCO2e ÷ 1000
Intensity: tCO2e/employee = Total tCO2e ÷ Employees

How to use this calculator

Enter your reporting period, headcount, and optional revenue.
Fill Scope 1 activity data and confirm emission factors.
Add electricity use and choose renewable share and factors.
Estimate Scope 3 using travel, commuting, waste, and spend.
Press Calculate to view totals above the form.
Use Download CSV or PDF to export the same results.

FAQs

1) What is the difference between location-based and market-based electricity?

Location-based uses the grid average emissions factor for where electricity is consumed. Market-based reflects supplier-specific factors, contractual instruments, or energy attribute certificates that change the purchased mix.

2) Are the default emission factors official?

No. The defaults are placeholders for convenience. Replace them with factors from your national inventory, utility disclosures, supplier data, or a recognized protocol before using results in formal reporting.

3) How should I handle renewables in Scope 2?

Enter the percent of electricity matched by renewables for the period. The calculator reduces the effective kWh accordingly, then applies your chosen location and market factors to the remaining kWh.

4) What refrigerants are supported?

Common refrigerants are included with typical GWP values. If you use another gas, select “Other” and enter its GWP. Ensure the GWP year and standard match your reporting guidance.

5) Can I use spend-based Scope 3 estimates?

Yes. Spend-based factors help create a first inventory when supplier data is missing. Over time, replace spend-based estimates with supplier-specific or product-level factors for better accuracy.

6) Does this calculator cover all Scope 3 categories?

No. It includes common categories: travel, commuting, waste, and purchased goods. Add other categories such as capital goods, shipping, and product use with additional factors if needed.

7) How can I improve data quality quickly?

Start with utility bills, fuel invoices, fleet logs, and travel reports. Align boundaries, keep units consistent, and document factor sources. Then validate unusual spikes by checking meter reads and duplicates.