How many micrograms are there in one kilogram?

1 microgram is 0.000000001 kilogram = 10-9 kilogram

or

1 kilogram = 109 micrograms
1g = 1 000 000 µg

1kg = 1000g

1 000 000µg/g x 1000g/kg = 1 000 000 000µg/kg = 1.0 x 109µg/kg