Contact

Write to developer.projectcalc@gmail.com. We read everything, and we prioritise reports of incorrect maths above everything else.

This is the most useful message you can send. Please include the calculator name, the inputs you entered, the result you expected and where your figure comes from. The quickest way is to use the Share link button on the calculator — that link encodes your exact inputs, so we can reproduce what you saw.

Every calculator shows a version number and review date beneath its title. Including those helps us tell whether you hit something we have already changed.

Tell us the job you were doing and what you could not work out. Concrete problems are far more useful than tool names — we choose what to build from real gaps, not keyword lists.

ProjectCalc does not ask for accounts and does not collect calculator inputs, so in most cases there is nothing held about you to access or delete. See the privacy policy for what is and is not processed, and write to the address above with any question it does not answer.