The H and B markings on pencils relate to the relative hardness or softness of the graphite used in it. H means hard, B means black. A 6B pencil has extremely soft, dark graphite and a 6H has very hard, pale graphite. HB is the average, mid-scale, type of pencil graphite for general use. Going … Read more

Dead easy really. A milligram (mg) is 1/1000th of a gram (g), and and gram is 1/1000th of a kilogram (kg).To turn milligrams (mg) into kilograms (kg), simply multiply by 1,000,000.