A milligram is a unit of mass. A fluid ounce is a unit of capacity. The two units are therefore incompatible.
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One ounce is larger than 1000 milligrams. One ounce is equivalent to 28,349.5 milligrams.
One milliliter = 0.0338 fluid ounces1mL is very small when converted to fluid ounces. (0.03 US fluid ounces) So I'll include this for you as well: 1 US fluid ounce = 29.57mL
In the US . . .1 fluid ounce = 0.125 cup1 cup = 8 fluid ounces
There is actually 2 tablespoons in 1 fluid ounce (1 cup=8 fluid ounces)
If you're trying to ask what the weight of a fluid ounce of something is, it depends on the density of the something in question. For water, 1 fluid ounce weighs pretty close to 1 ounce. A fluid ounce of mercury weighs nearly a pound.