How to Calculate Your Business's Carbon Footprint (Step by Step)

To calculate your business carbon footprint, add up your emissions across three scopes — Scope 1 (direct), Scope 2 (purchased energy) and Scope 3 (value chain) — converted into tonnes of CO₂e using standard emission factors. Most small businesses can produce a solid first estimate in an afternoon using bills and records they already keep; the harder part is Scope 3, which usually dominates the total.

What a business carbon footprint includes

• Scope 1 — direct emissions from sources you own or control: company vehicles, gas boilers, on-site generators and refrigerant leaks.
• Scope 2 — purchased energy you buy and consume, mainly grid electricity, plus any district heating or cooling.
• Scope 3 — everything else in your value chain: purchased goods and services, business travel, employee commuting, waste, shipping and the use of products you sell.
• The 80% rule — for most SMEs, Scope 3 makes up the large majority of total emissions, so ignoring it badly understates your footprint.

The steps to measure it

Work through five practical steps. First, set your boundaries — decide which sites, subsidiaries and scopes you are counting and pick a 12-month reporting period. Second, gather activity data: litres of fuel, kWh of electricity, miles travelled, kilograms of waste. Third, apply emission factors that convert each activity into CO₂e (a kWh of electricity, for example, carries a factor tied to your national grid mix). Fourth, total everything in tonnes CO₂e so the different gases and sources sit on one comparable scale. Fifth, sanity-check the result against a per-employee or per-revenue benchmark. If you want a shortcut for the first pass, the free Evertreen CO₂ calculator turns a few inputs into an estimate you can build on.

Data sources SMEs already have

• Utility bills give you kWh of electricity and gas straight from your supplier — the backbone of Scopes 1 and 2.
• Fuel and mileage records from fuel cards, expense claims and vehicle logs cover fleet and business travel.
• Purchase ledgers and supplier invoices feed a spend-based estimate of Scope 3 when you lack supplier-specific data.
• Waste and courier accounts report tonnage and shipments you can convert with published factors.

Reduce first, then offset the rest

Measuring is only the start — the credible order is to cut what you can, then offset the residual you cannot yet eliminate. Switch to a renewable electricity tariff, cut business travel, improve building efficiency and lean on lower-carbon suppliers before you buy anything. For the emissions that remain, you can compensate transparently: Evertreen lets you plant trees from £1.5 each, every one geolocated with a GPS pin and progress photos, backed by on-the-ground field videos from planting teams. Because trees take years to sequester carbon, we are honest that planting is a long-term removal, not an instant cancellation — our method for estimating tree CO₂ shows exactly how the numbers are derived.

When you need certified credits

If you are reporting formally or want independently audited removals, tree planting can sit alongside verified carbon credits. Evertreen offers certified Verra and Gold Standard carbon credits on request, so finance and sustainability teams can back claims with recognised standards. Featured in 300+ media outlets and available via API and Shopify integration, the platform lets you build offsetting into your operations once you know your number — and keep tracking it year over year.

Frequently asked questions

What is a business carbon footprint calculator? It is a tool that converts your activity data — energy use, fuel, travel and spend — into total tonnes of CO₂e across Scopes 1, 2 and 3, giving you a single figure to track and reduce.

How long does it take to calculate a small business footprint? A first estimate using utility bills, mileage and purchase records typically takes a few hours; a thorough Scope 3 assessment with supplier data can take several weeks.

Should I reduce emissions or offset them first? Reduce first — cut what you realistically can through energy, travel and supplier changes, then offset only the residual emissions you cannot yet eliminate.