Put your number
into action.
Calculated elsewhere? Enter the tonnes of CO₂e you want to offset and choose carbon credits for your business.
Free Business Carbon Footprint Calculator
Put your number
Start free.
Start with Lite.
A free business carbon footprint calculator for a small business taking its first step.
- Annual footprint for one site
- Energy, vehicles and business travel
- Save your calculation and get a PDF report
Start with Sustrax Lite
Free account · activity input limits apply
Go further
with Sustrax MX.
Explore business carbon accounting software for a more connected reporting workflow.
- Monthly tracking across multiple sites
- Team access and bulk data uploads
- Broader Scope 3 reporting options
Try Sustrax MX free for 7 days
Contact us for a demo
Choose a trial or a demo · explore the platform
20+ years of carbon expertiseUK Government emission factorsSupport from Carbon Footprint Ltd
From bills to a business footprintHow to calculate your
How to calculate your
business carbon footprint.
Start with a clear reporting period and the activities you want to measure. Consistent records make your results more useful.
01
Choose your reporting boundary
Decide which site, company activities and dates your calculation covers. Record what is included and what still needs collecting.
02
Add your activity data
Enter consumption and travel records in the calculator. Emission factors convert these activities into tonnes of carbon dioxide equivalent (CO₂e).
03
Review your results and plan action
Check the entries and any gaps, save the report and identify where you can reduce emissions. Keep the underlying bills and records alongside your calculation.
Know what your number includesWhat makes up a
What makes up a
company carbon footprint?
Business emissions are grouped into three scopes. Your footprint depends on the activities you include, the data you enter and the calculation methods you use.
Fuel you burn
Emissions from sources your business owns or controls, such as fuel used in boilers and company vehicles. Refrigerant leaks can also be relevant to a complete inventory.
Energy you buy
Emissions associated with purchased electricity, heat, steam and cooling. Electricity methods and factors need to reflect the location and reporting approach.
Activities beyond your site
Other indirect emissions, such as business travel, purchased goods, freight, waste and employee commuting. Relevant categories vary with your business.
Choose the right coverage. Lite provides a starting point for energy and travel inputs; it does not automatically cover every source listed above. For wider categories and reporting needs, compare the software options or get help with business carbon footprinting. Scope definitions follow the GHG Protocol Corporate Standard.
Turn measurement into actionHow to reduce your
How to reduce your
business carbon footprint.
Use your results to prioritise the activities contributing most to your footprint. Look at heating and electricity efficiency, travel choices and purchasing decisions. Set actions, assign owners and track progress using a consistent reporting boundary.
Already have a calculated footprint?
You can use a calculation from another tool or a consultant. Enter the tonnes of CO₂e you want to offset in the box above, then review the available projects and purchase details in our store.
Keep your measured emissions and carbon credit purchases recorded separately. Purchasing credits supports climate projects; it does not reduce the emissions shown in your inventory or automatically certify your business as carbon neutral.
Your questions, answeredBusiness carbon
Business carbon
calculator FAQs.
Practical answers before you measure, report or offset your emissions.
Need help with your particular business? Speak to our team.
Which calculator should an SME start with?
We recommend Sustrax Lite for SMEs starting with a straightforward annual footprint for one site. If you need more input capacity or sites, compare the Lite upgrades. For monthly tracking and a team workflow, explore Sustrax MX.
Is the business carbon footprint calculator free?
Sustrax Lite has a free plan with activity input limits. You need an account to use it. Carbon credit purchases, paid software plans and consultancy are separate. Review the current plan comparison before choosing.
What is the difference between Lite and the MX trial?
Lite is a free starting plan for a simple business footprint. The free seven-day MX trial lets you explore the broader platform. MX is a paid product after the trial; check the current terms and the features included in your chosen package.
What does CO₂e mean, and which units should I enter?
CO₂e means carbon dioxide equivalent: a common unit used to express the climate impact of different greenhouse gases. Enter your footprint in tonnes of CO₂e in the offset box. If your report uses kilograms, divide by 1,000 first: 25,000 kg CO₂e equals 25 tonnes CO₂e.
Can I offset a footprint calculated elsewhere?
Yes. Use the relevant total from your report or another calculator. Confirm its reporting period, units and included activities, then enter the amount you want to offset. You do not need to recalculate it in Lite first.
Does Lite calculate my whole company footprint?
Only the activities you enter are included. A complete company inventory may need additional categories, sites or methods. Check your reporting boundary and data gaps, and choose suitable software or expert support for the coverage you need.
Can businesses outside the UK use this page?
Businesses can explore the Sustrax options here. Before calculating, check that your plan supports the country, electricity factors and activity types you need. For operations spanning several countries, ask our team about the right setup.
Can I use the results for customer or statutory reporting?
The results can help you assemble emissions data. Check that the boundary, categories, period and methodology meet the specific reporting request. A calculator report is not itself independent verification. Explore our verification and assurance services if you need a reviewed inventory.
Where do the emission factors come from?
The Sustrax calculation engine uses UK Government emission factors, with additional sources for supported activities and locations. Check the factor source and year used for your records. For more about the platform and its emissions database, see Sustrax software.
Where is the personal carbon footprint calculator?
For home energy, personal travel and lifestyle, use our free personal carbon footprint calculator. This page is for business emissions.
For Your Website
Add our calculator tools to your website
Embed the Sustrax Lite calculator, or our free personal calculator, on your own site. See the free calculator tools page for instructions.
Starting your business footprint?
Start with Sustrax Lite.
A free first step for SMEs. Expert support when you need it.