None. It is graphite not lead in a pencil.
How much graphite in a pencil? About 2/3 cubic inch (=6" x pi * (3/16)^2)
Divide 4.6 lbs by the lead density in lbs/cubic inch
244.5 (rounded)
1,728 cubic inches.
There are 1,728 cubic inches to the cubic foot
There are 1,728 cubic inches in a cubic foot.
1728 cubic inches = 28316.8 cubic centimeters
According to my calculations, 2.44 in3 of lead would weigh one pound.
2.81 cubic inches.
That is 79.33 cubic inches.
111.92 cubic inches.
About 0.061 cubic inches per cubic centimeter.
1 cubic foot = 1,728 cubic inches.