The carbon footprint of a company is measured in tonnes of CO2 equivalent (tCO2e): you collect activity data (energy use, fuel, travel, purchases), multiply each activity by an emission factor, and sum the result across Scopes 1, 2 and 3 using a recognised methodology such as the GHG Protocol or ISO 14064.
That formula sounds simple. The hard part is defining boundaries, finding reliable data and keeping an audit trail that auditors and regulators can follow.
Why measuring the carbon footprint matters
Measuring the carbon footprint helps organisations set reduction targets, prepare for regulation and respond to investors and customers who expect transparent environmental data.
Beyond compliance, a structured inventory often reveals energy waste, logistics inefficiencies and supplier risks that were invisible before you started counting emissions. Companies that measure consistently can align with the Sustainable Development Goals and improve how they communicate environmental performance to the market.
Step 1: Define the boundary before you calculate
Before analysing the carbon footprint, establish what you include: legal entities, sites, joint ventures and the reporting period (usually one calendar or fiscal year).
A product footprint, a corporate footprint and a national inventory are not measured the same way. This article focuses on organisational carbon footprint for companies.
You also need to decide whether to report location-based or market-based Scope 2 emissions if you buy renewable electricity or certificates. Document that choice; it affects comparability year on year.
Scopes 1, 2 and 3: what to include
GHG inventories split emissions by how directly the organisation controls or influences them.
Scope 1: direct emissions
Scope 1 covers emissions generated on site or from assets the company owns or controls. Typical sources include:
- Combustion of fuels in boilers, furnaces or company vehicles
- Refrigerant leaks from air conditioning or cooling equipment
- Process emissions from industrial activities
These are usually the easiest to measure because data comes from meters, fuel receipts or fleet logs.
Scope 2: purchased energy
Scope 2 covers indirect emissions from electricity, heat, steam or cooling purchased for offices, plants and data centres.
Inputs are usually kWh or MWh consumed, multiplied by a grid or supplier-specific emission factor. If you operate across countries, use factors that match each location.
Scope 3: value chain emissions
Scope 3 captures indirect emissions across the value chain: purchased goods and services, business travel, employee commuting, upstream transport, waste, use of sold products and more.
Scope 3 is often the largest share of a corporate footprint and the hardest to calculate because it depends on supplier data, estimates and assumptions. Our Scope 3 emissions guide explains how to prioritise categories and improve data quality over time.
Tip: Start with a materiality screen: identify which Scope 3 categories represent the biggest share of your footprint (often purchased goods, travel or logistics) before trying to measure all 15 categories at once.
Methodologies used to measure carbon footprint
Different standards share the same core logic (activity data × emission factor) but vary in scope, gas coverage and reporting rules.
GHG Protocol Corporate Standard
The GHG Protocol is the most widely used international framework for Scope 1, 2 and 3 reporting. It is not a certification standard, but it provides consistent rules for building GHG inventories and communicating results to stakeholders.
ISO 14064-1:2019
ISO 14064-1 sets requirements for designing, managing and reporting organisational GHG inventories, including boundary selection, emission sources and internal quality controls. It supports reporting significant indirect emissions, not only Scopes 1 and 2.
ISO 14067:2019
ISO 14067 applies to product carbon footprint: criteria and guidelines for quantifying emissions across a product life cycle. The standard is not certifiable on its own, but results can be verified by approved third parties.
Need to measure Scopes 1, 2 and 3 without rebuilding spreadsheets every year? Dcycle centralises activity data and keeps methodology documented for audit-ready reporting.
Request a demoHow the calculation works in practice
Once boundaries and methodology are set, measurement follows four steps:
- Collect activity data from primary sources (invoices, meters, ERP, fleet systems, surveys) or recognised secondary databases where primary data is unavailable.
- Classify each source into Scope 1, 2 or 3 using consistent rules.
- Apply emission factors from official databases or supplier-specific values and document every assumption.
- Sum tCO2e and review outliers before publishing or using the inventory for targets.
The output is a total footprint, usually broken down by scope, site, business unit or product line depending on your reporting needs.
Automated data collection reduces manual errors when the same energy or travel data must feed ISO reports, CDP, customer questionnaires and internal dashboards.
What to do after you measure
The most important step after calculating your footprint is to use the data: set science-based or internal reduction targets, track progress quarterly and only then consider offsetting residual emissions you cannot eliminate.
Measuring once a year at year-end creates stress and gaps. Companies that treat carbon accounting as a continuous process catch anomalies early and arrive at reporting deadlines with validated data.
Our carbon footprint platform supports organisational and product-level measurement with traceability from source data to reported totals.
Tip: Record your base year, boundary definition and emission-factor sources in a short methodology note. Auditors and assurance providers will ask for this before they trust the numbers.
Frequently Asked Questions (FAQs)
What unit is used to measure carbon footprint?
Corporate carbon footprint is expressed in tonnes of CO2 equivalent (tCO2e). CO2e converts methane, nitrous oxide and other greenhouse gases into a single comparable unit based on global warming potential.
What is the difference between Scopes 1, 2 and 3?
Scope 1 covers direct emissions from owned or controlled sources. Scope 2 covers indirect emissions from purchased energy. Scope 3 covers other indirect emissions in the value chain, such as suppliers, travel and product use.
Together, the three scopes provide a full organisational picture when reported under the GHG Protocol or ISO 14064.
Can a company measure its carbon footprint without software?
Yes, especially for small inventories with few sites. Spreadsheets can work for a first estimate.
As scopes, sites and reporting obligations grow, manual methods become error-prone. Dedicated tools improve data collection, factor management and audit trails.
Which methodology should my company use?
Most companies start with the GHG Protocol Corporate Standard because it is widely recognised by investors and regulators. If you need a formal ISO-aligned inventory or product footprint, use ISO 14064-1 or ISO 14067 respectively.
Pick one primary framework and document how you map data to it.
How often should carbon footprint be measured?
At minimum, once per reporting year for statutory or voluntary disclosure. Best practice is continuous or quarterly tracking of key sources (energy, fleet, travel) so year-end reporting is a consolidation exercise, not a data rescue mission.