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You are comparing 2 different things: weight and volume. So this question cannot be answered, unless you tell me what substance you are working with =] First of all, mg is a measure of weight and ml is a measurement of volume, to determine how many ml 400mg is we need to know what density or Specific Gravity (SG) the substance is. Water has a SG of 1 and a density of 1kg per liter.

there are 1000mg in 1 gram and a 1000 grams in a kilogram (about 2.2 pounds) so 400mg=0.0004 kilograms.

The density of Gold is about 19.3kg per liter ( or 19.3 grams per ml).

The formula for density is D=m/v (Densityequals mass over volume) Mass divided by volume.

Also see http://wiki.answers.com/Q/What_is_the_formula_for_density

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16y ago

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Actually, mg is a unit of mass, and mL is a unit of volume, therefore they're not equal at all. It all depends on what substance weighs 400mg. Get the density of that substance, and use that to convert to mL using D=M/V (Density=Mass/Volume). Or, since you're solving for volume, it would be M/D=V (Mass/Density=Volume)

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Wiki User

16y ago
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Grams (g) or Milligrams (mg) are a dry mass measurement.

Litres (l) or Millilitres (ml) are a fluid measurement of volume, and subsequently, they don't convert with one another.

There is an exception to this rule. 1g of water has a volume of 1cm3 which equates to 1ml at room temperature.

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Wiki User

15y ago
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The conversion from milligrams (mg) to milliliters (ml) depends on the density of the substance. Without knowing the density of the specific substance, a direct conversion can't be made.

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AnswerBot

9mo ago
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Does not convert; milligrams (mg) and grams (g) are measures of weight or mass and mL (milliliters) is a measure of volume.

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Wiki User

10y ago
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400 mg is equal to 0.4 grams

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Wiki User

11y ago
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Q: What is 400 mg in ml?
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