Imperial versus decimal

Imperial versus decimal   (08/13/2009, 5:27 AM)

I've just used the calculator to convert 69.5 kg into stones and I get 10st. 9 lbs, but 70.5kg is 11st. 1 lb.

1 kg doesn't = 5lbs.

My question, does the caculator realise that there are 14 lbs in 1 stone and not 10 lbs. Is it working on decimal instead of imperial.

Are all the calculations right on here?