Free carbon footprint calculators for businesses

To understand your carbon emissions, you’ll need to measure your carbon emissions.

One of the best ways to do that is with a carbon footprint calculator.

We’ve made a list of some of the most popular free carbon footprint calculators to help you begin your journey to net zero.

1 SME Climate Hub – Business Carbon Calculator

Target audience: SMEs.

Source: This free, interactive calculator is powered by Normative on behalf of the SME Climate Hub. It was specifically developed for smaller businesses with support from It assesses SMEs’ Scope 1, 2 and 3 emissions following the globally recognised Greenhouse Gas Protocol, through a user-friendly, simplified and automated interface.

Delivery: online

Additional comments: It offers advice from net-zero experts to support companies with their emission profiles. 

2 Carbon Trust: SME Carbon Footprint Calculator 

Target audience: SMEs.

Source: Carbon Trust

Delivery: online

Additional comments: It includes direct emissions from fuel and processes (Scope 1 emissions) and those emissions from purchased electricity (or Scope 2 emissions) for the assets they operate.

The SME Carbon Footprint Calculator is not a complete evaluation of an organisational footprint. It only includes selected emission sources, common to the majority of SMEs using an operational control approach.

3 NatWest’s Carbon Planner

Target audience: All UK organisations – you do not have to be a NatWest customer to sign up to Carbon Planner.

Source: NatWest 

Delivery: online

Additional comments: The NatWest Carbon Planner was “customer-led in design” and developed with the insight of more than 2,000 businesses. 

NatWest’s Carbon Planner helps businesses measure their carbon output and recommends ways to identify potential cost and carbon savings. It takes a business through four practical steps to help them take action: inform, diagnose, plan and deliver.

4 GHG Protocol Calculator

Target audience: Governments, SMEs, and large businesses. The GHG Protocol is the most widely used emissions reporting framework in the world.

Source: GHG Protocol

Delivery: Accessible as an Excel spreadsheet with step-by-step instructions.

Additional comments: It is supported by a range of training and events on industry standards and carbon accounting.