LENGTH		

millimetre	metre		inch		foot		yard
mm		m		in		ft		yd
=====================================================================
1		0.001		0.0394		0.0033		0.0011
1000		1		39.3701		3.2808		1.0936
25.4		0.0254		1		0.0833		0.0278
304.8		0.3048		12		1		0.3333
914.4		0.9144		36		3		1