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Why calculate?

Small and medium sized companies (SMEs) make up 90% of global business and are the foundation of the world’s value chains. Though the individual footprint of an SME might be small, together they contribute a sizable amount to the global carbon footprint. Many SMEs want to act but may not know where to start. Measuring and understanding your emissions is a great first step to help your business start taking meaningful action.

Small Business Carbon Calculator

Coming March 2025.
A simple, accessible calculator, for small businesses starting their carbon measurement journey. Designed to help make sense of carbon measurement and identify emissions hotspots.

Best starting point for small businesses operating at one site
Simple online tool
Scope 1,2 & 3

Advanced Business Carbon Calculator

A comprehensive, transparent and auditable calculator, ideal for medium and large businesses, with the flexibility to incorporate data from multiple sites. This provides enhanced carbon measurement to accelerate progress towards Net Zero.

Best for multi-site businesses
Auditable spreadsheet tool
Scope 1,2 & 3

Scope 3 Specific Calculator

An intuitive platform that transforms simple procurement data into accurate, quality-checked Scope 3 emissions data, enabling accurate reporting and decarbonization decisions to lower your biggest emission hotspots.

Best for supply chain deep dives
Powerful online tool
Measures Scope 3

Compare tools

	Small Business Carbon Calculator	Advanced Business Carbon Calculator	Scope 3 Specific Calculator
Best For	One-site businesses	Multi-site businesses	Supply chain deep dives
Format	Simple online tool	Auditable Spreadsheet	Powerful online tool
Scope	1,2 & 3	1,2 & 3	3 only
Business Size	1-50	Any	Any
Cost	Free	Free	Free
Information required	Basic	Intermediate	Procurement

Testimonials

Advanced Business Carbon Calculator was a revelation, it held my hand through the process with simple, clear and concise instructions. Now I have a basis to start plugging away at reducing our GHG impact.

Charlie Westhead

Owner of Neal's Yard Creamery

Using the Advanced Business Carbon Calculator has simplified the process of measuring our carbon footprint and has helped us to expedite our approach to decarbonisation.

Geraldine Hogben

مديرة العمليات في Tann Westlake

We can’t improve what we can’t measure – Emitwise’s carbon management platform has quantified our Scope 1, 2 and 3 emissions, enabling us to identify hotspots and align with the Science-Based Targets.

Tyler Matusevich

Director of Sustainability, Brook & Whittle

*Disclaimer: As a charitable organisation and host of the SME Climate Hub, We Mean Business Coalition does not endorse any solution providers including the Equipoise/Emitwise business or any of its fee-based products, services, or other operations.