The Answers community requested more information for this question. Please edit your question to include more context.
Gallons can't be converted to milligrams. Gallons measure volume, while milligrams measure mass.
Gallons are a measurement of volume, and grams are a measurement of mass (weight), so it would depend on what type of material you measuring.
3 milligrams
3 millilitres is equal to 3,000 milligrams.
There are 3000 milligrams in 3 grams of salt.
3 millilitres is equal to 3,000 milligrams.
There are 3000 milligrams in 3 grams. A milligram is 1/1000 of a gram. There are 1000 milligrams in 1 gram.
There are 1000 x 1000 = 1000000 milligrams in one kilogram. Therefore, 3 milligrams is equal to 3/1000000 = 0.000003 kilograms.
There are 1000 milligrams in one gram. Therefore, 3 grams is equal to 3 x 1000 = 3000 milligrams.
2.023x10^3 is 2023 kilograms . There are 1000000 milligrams in a kilo. Therefore 2023 kilos is 2,023,000,000 milligrams.
That is 3 gallons
1 gram = 1,000 milligrams 2 grams = 2,000 milligrams 3 grams = 3,000 milligrams 3.5 grams = 3,500 milligrams