Business Carbon Footprint Calculator

Measuring your carbon footprint is the essential first step toward reducing it. It helps you identify your biggest emission sources, set meaningful reduction targets, meet growing investor and customer expectations on sustainability, and comply with emerging reporting regulations such as CSRD and SECR.

Scope 1 covers direct emissions from sources your business owns or controls, such as company vehicle fuel and on-site gas boilers. Scope 2 covers indirect emissions from purchased electricity and heat. Scope 3 covers all other indirect emissions in your value chain — business travel, employee commuting, supply chain purchases, and waste — and typically represents the largest share of a business's footprint.

CO₂e stands for carbon dioxide equivalent. It's a standard unit that converts different greenhouse gases (methane, nitrous oxide, etc.) into a single figure based on their global warming potential relative to CO₂. This makes it easier to compare and report total emissions consistently.

Spend-based estimation uses your procurement spend and an average emission intensity factor to approximate Scope 3 supply chain emissions. It's a recognised starting-point method (used in the GHG Protocol) when supplier-specific data isn't available. For greater accuracy, you can request emissions data directly from your key suppliers.

You'll need your annual electricity and gas bills (in kWh), fuel receipts for company vehicles (in litres), a count of business flights taken by all staff, rough commute distances, waste tonnage estimates, water bills, and total supplier spend. Annual utility bills are usually the most reliable data source.

It varies significantly by sector. A 50-person office-based business might generate 50–150 tonnes of CO₂e per year, while a similar-sized manufacturer or logistics firm could produce several times more. Benchmarking against sector averages — and tracking year-on-year reduction — is more meaningful than comparing across industries.

Start with your largest emission sources. Common actions include switching to renewable electricity tariffs (reduces Scope 2), transitioning to electric or hybrid fleet vehicles (reduces Scope 1), cutting unnecessary business flights, encouraging low-carbon commuting, reducing waste to landfill, and engaging suppliers on their own emission reductions.

This calculator provides a solid estimate for internal awareness, goal-setting, and early-stage reporting. For formal disclosures (e.g. CDP, SECR, GRI, or verified net-zero commitments), you should work with a qualified carbon consultant who can apply primary activity data, appropriate emission factors for your country, and third-party verification.