None. Milligram is a unit of dry measure, and milliliter is a unit of liquid measure. That said, you could have a milliliter of fluid that contains (some number of) milligrams of a medication.
See the link for a metric equivalency table.
Edit:
You can do the conversion easily, if you have the density of the sustance.
It depends on the fluid being measured. One ml. of water weighs 1 000 mg. but 1 ml. of alcohol weight about 20% less.
The formula to use is:
1 ml. of liquid = 1000 mg. x Specific Gravity of the Liquid
milliliters measure volume and milligrams measure mass so you can't say how many milligrams (note spelling) are in a milliliter.
But you can ask how many milligrams is 10 milliliters of water / custard / coffee etc
3 millilitres is equal to 3,000 milligrams.
3 millilitres is equal to 3,000 milligrams.
The units are incompatible. Milligrams measure mass, millilitres measure volume.
1.2 millilitres
None. Millilitres measure volume, milligrams measure mass.
2 millilitres.
The prescribed limit is:35 micrograms of alcohol per 100 millilitres of breath.80 milligrams of alcohol per 100 millilitres of blood.107 milligrams of alcohol per 100 millilitres of urine.
Mg is weight(milligrams) while ml is volume(millilitres), so it will depend on the density of the substance.
It would be 4 millilitres.
There are 1000 milligrams in one gram. Therefore, 0.25 grams is equal to 0.25 x 1000 = 250 milligrams.
The prefix "milli" means a "thousandth" Thus there are: One thousand milligrams in a gram. One thousand milliliters in an liter. Armed with this information the answer is obvious (hint - multiply 1.6 by 1000). Therefore the answer is 1600 millilitres
A minim is a unit of capacity, not of mass. In the United States, it is equal to one sixtieth of a dram, or 0.0616 millilitres, rounded to three significant figures. In the United Kingdom, it is equal to one twentieth of a scruple, or 0.0592 millilitres.