The formulas necessary to calculate the balloon’s dimensions were taken from the reference books Brockhaus Physics Lexicon and the handbook Syllabus for Gas Engineers.

I have now put these formulas in an MS-Excel spreadsheet which enable a balloon to be correctly calculated. The formulas are specifically tailored for a balloon with the shape indicated in brown in the bottom right-hand corner of the picture. This is in fact the shape that all of our balloons had.

The “Balloon Calculator” program can be downloaded as a zip-file by clicking on the picture below.

The “Balloon Calculator” program can be downloaded as a zip-file by clicking here.