I would like to thank Ke Wu, Brett and Ian for their support on this issue. I am disappointed that there has been no comment from forum users living the US.
I am also old enough to know both systems UK Imperial and metric,I still do some work in Imperial measurement. Australia went metric in the early 1970’s I started my machining apprenticeship in Imperial and finished it in metric. I did my Mechanical Engineering in SI and I understand what Brett is saying about simplicity. I work in science and that uses SI world wide.
I get very frustrated when I read a report on a MYOG stove only to read some of the measurements in metric and some in US, it is so easy to use metric. It is nice to see that the BPL stoves editor Roger Caffin uses metric units as the basis of his testing.
Zen stoves have a very good conversion site. http://zenstoves.net/Calculator.htm
Tony