Free carbon footprint calculators for businesses
To understand your carbon footprint, 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 – Emissions measurement tools
Target audience: SMEs
Source: SME Climate Hub
Delivery: online
The SME Climate Hub is the global initiative promoting climate action in SMEs. They offer new free emissions measurement tools:
Advanced Business Carbon Calculator: a tool designed for SMEs with operations across multiple facilities who are looking for a more comprehensive carbon calculator to measure their Scope 1, 2, and 3 emissions.
Scope 3 Specific Calculator: a Scope 3 calculator which uses procurement spend data to create a Scope 3 emissions model and help SMEs understand which of their suppliers have the highest emissions.
Small Business Carbon Calculator: In March 2025, the SME Climate Hub will launch this simple and accessible tool, specifically designed to help SMEs with under 50 employees get started on their emissions measurements.
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 that businesses 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.