Here we continue our search for free carbon calculators so we can compare their results with those we obtained using the Business Carbon calculator. We highlight the difficulties with finding free calculators and without drawbacks such as additional paid for services. Our rationale for this is that we are trying to replicate the position of a small business owner who is, at this stage, information gathering. They are probably unwilling to engage consultants before gathering the information to determine if they need to take further action. Next time, we’ll go back to first principles!