Hi Magnus, just a quick note the say thank you for your cardboard box calculator and also that your width calculation is incorrect. The instructions for where to fold and where to cut also seem to be reversed. This would be such an excellent tool for DIY'ers to reuse cardboard boxes as recycled shipping containers. How many times does Amazon put a tiny item in a huge box? Too many times. Please fix your program and please market it to everybody on Earth as a true, grass roots recycling effort. Thank you! Best, Barry Densch, Retired Inventor at 3M

Thank you very much, I found an error with the width calculation and it should be fixed now. However the "where to fold and where to cut" remark, I don't understand. Also I made some other changes to prevent you from reading numbers from the wrong line. (A mistake I've done myself). Thanks again. Magnus.