How many milligrams are in one milliliter?

Question

My dog is on medication. The perscription was writen for 2.5 mg but the pharmacy gave her liquid. It says to give her 1mL.

I will call them Monday but I just wanted to ask to see if that sounded right. Seems odd to me.

Answer 1

That depends on the mass of the item you are measuring.

mg (one thousandths of a gram) is a measure of mass (weight)

ml (one thousandths of a liter) is a measure of volume

Water has a specific gravity of 1 g/cc, which is equivalent to 1g/ml. Therefore 1 ml of water would weigh 1000 mg. 1 ml of mercury would weigh about 14,000 mg. or 14 g. Just multiply the specific gravity of the item you are dealing with times 1000 if you need know the weight in mg of 1 ml.

Answer 2

I got this from one forum. The problem is similar to you. Hope youll find the answer. Here it is.

Q: We need to know how to convert a (liquid) ml into a (weight) mg. Here is the reason, we are Guinea Pig owners. We would like to administer 10 - 20 mg of Liquid Vitamin C to them daily. We have a bottle of 4 Fl oz (120 ml) that indicates it contains 24 servings of 500 mg per serving. Guinea care websites suggest we administer 10-20 mg daily to the adult pig . We are using a 1 cc syringe, it does not have a ml measurement on it. Just off the top of our head we estimate we should be giving .25 cc to the adult who weighs two pounds and .1 to the younger pigs who will top out around 1/2 - 3/4 of a pound. This problem is really stretching the limits of my 3d grade education, can anyone help ? Thanks in advance


A: This is a question that keep re-appearing in various forms, so don't wory too much about it.

The whole thing hinges around the fact that most people who are not familiar with the metric system, (as well as an astonishing number of those who use it every day!) have no real idea how it was put together.

The simple part. It all starts with a measurement of length. the size of the earth, pole to pole, through an aribtrary point of the earth. We then hacked that up into smaller peiced, always using units of ten, until we got with something we could use. We called it the meter, (or metre), and it was good. We then took this meter, chopped it up a bit smaller, (into hundredth, or centimeters) and made a box. we filled that box with water, and said, "verily, this is our unit of weight. we will call it the gram, and it will be good."

We then decide that if we made the box 100 time bigger, and filled it with water, that this would be our standard of volume. We would call it the liter, and it too would be good.

The story goes on a bit longer, but we can stop here... One cubic centimeter of water weighs one gram, and 1,000 grams of water makes a liter. This means that the cubic centimeter (cc) and the milliliter (1/1000 of a liter) (ml) are exactly the same thing - if you're measuring water.

So, if your vitamin C solution is close enough to the weight and consistancy of water, then 1 ml should be about 1 cc. If not, all bets are off.

Now to apply this to your problem...

120 ml = 24 servings of 500 mg each. 120/24 = 5 ml, so 5 ml = 500 mg.

That means that 1 ml = 100 mg

If you want to give a Guinea Pig 10 mg, he gets 0.1 ml, to give him 20 mg, give him .2 ml.

You do the math. Hope your dog will get well soon!



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Answer 3

One gram of water by definition is one milliliter volume.

So if the liquid is close to the density of water then there will be a thousand milligrams in one milliliter.

Since you are advised to give 2.5 mg, the medicine must be very dense or else someone is confused in giving you directions.

Wait till you can talk with the vet.

Answer 4

Theoretically, milliliter, which is a unit of volume or capacity, cannot be converted into milligrams, which is a unit of mass.
However, if you are talking about the mass of a certain volume of a substance, it depends on the density of the substance involved... One milliliter of water would be 1000milligrams while one milliliter of mercury would have a mass of around 13.6 times that of 1 milliliter of water...

Answer 5

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RE:
How many milligrams are in one milliliter?

Answer 6

There is an equivalent amount of gram to convert this into milli liter which 1 is to one, now 1 gram is equal to 1000 milligram.If the vet prescribe 2.5 milligram this would be equal to 0.0025 grams. So if this 0.0025 grams is to convert in milli liters that would also be equivalent to 0.0025 milli liters. If you are to get the right amount 0.0025 milli liters or ml.you would be needing a special accurate liquid measuring device. because imagine how much 0.0025 is a lot smaller than 1 ml. If you have a liquid measuring device that can give you the exact amount of it, much better because you can get the exact liquid amount . If non , i guess the pharmacist suggestion was the closes dosage in that.

Answer 7

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Here's three ways: 1. If you need a pretty exact answer, carefully weigh a clean, empty 100ml flask. Pour exactly 100ml of citrus juice into the flask, reweigh the flask plus juice. The difference between the two weights (I'll call it W mg) is the mass of 100ml of the citrus juice. The number of ml in 6000mg will be 6000 x 100/W 2. If you only need a rough answer, citrus juice is a little more dense than water, so each ml will weigh a bit more than 1g. Therefore, 6000mg (i.e. 6g) will take up a bit less than 6ml. 3. If you know the density of the citrus juice, simply divide 6000 by this density (or divide 6 by the density, depending on what units you express the density in).

Answer 8

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Answer 9

Grams are for mass.
Liters are for volume.
Of course, Milli- anything is thousandth of it.

If you know what substance you are measuring and you know the density, you can convert one from the other. Otherwise, they are completely different measurement.

It is like comparing pounds and gallons.

Answer 10

Umm...well if the doctor gave you liquid and the thing says to give it 1 mL, then it's probably correct.
If you really want to make sure then give the dog a little less then the prescription.