How many kilograms are in 630 milligrams?

Answer 1

milli- prefix means 1/1000

kilo- prefix means 1000

→ 1 mg = 1/1000 g

→ 1 g = 1000 mg

1 kg = 1000 g = 1000 × 1000 mg = 1000000 mg

→ 1 mg = 1/1000000 kg

→ 630 mg = 630 × 1/1000000 kg = 0.00063 kg = 6.3 x 10^-4 kg

Answer 2

One kilogram equals 1000 grams. One gram equals 1000 milligrams. Accordingly, 630 milligrams equal o.630 grams that equals 0.000630 kilograms.