It start to calculate as soon you change or write new figures in the white or dark red boxes.
Do not exceed the maximum number of characters, delete characters if necessary.

Note:
You use the information on your own risk!
There can always be a mistake in my equations behind the calculations, check that the result is correct.
Let me know if you find something wrong and I try to correct it.
Some calculations are very simple done and not correct in the small details.