The mistake this tool exists to prevent
You measure a wall and it comes to eight feet six inches. You open a converter and type 8.6.
The converter gives you 2.621 metres. The real answer is 2.591 metres. You are three centimetres out.
The reason is that there are twelve inches in a foot, so six inches is half a foot, which is 0.5 and not 0.6.
Three centimetres does not sound like much. On a cut piece of skirting it is a visible gap. On a worktop it is a piece that does not fit.
That is why this tool takes feet and inches in separate boxes and does the conversion itself.
