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Milligrams to Milliliters Converter

Convert milligrams to mL of a liquid. A milligram weighs the substance and a millilitre measures the liquid, so the two only connect through a concentration in mg per mL. It defaults to 1 mg/mL.

Milligrams ⇄ Milliliters
mg
=
mL
Concentration:
Result100 mg = 100 mL (1 mg/mL)
Quick answer
A milligram is a weight and a millilitre is a volume, so you cannot convert one to the other without knowing the concentration in mg per mL. Divide the milligrams by that concentration to get the volume. At the default 1 mg/mL, 100 mg is 100 mL; at 10 mg/mL the same 100 mg is only 10 mL. The result scales straight up or down with the concentration you pick. cc and mL are the same, so mg/mL equals mg/cc.

Conversion table

Milligrams (mg)Milliliters (mL)
10 mg10
25 mg25
50 mg50
100 mg100
250 mg250
500 mg500
1000 mg1000
5000 mg5000

How to convert mg to mL

mL = mg ÷ concentrationconcentration in mg/mL · default 1 mg/mL · reverse: mg = mL × concentration
mg
the amount in milligrams
mL
the volume it fills, in mL (= cc)
concentration
milligrams of substance per mL of liquid

The result assumes the concentration you choose and scales linearly with it, so a dilution twice as strong gives half the volume. There is no single mg to mL number; read the real concentration off your product.

This is reference information, not medical advice. Always follow the dose and concentration on the label or from a professional.

Frequently asked questions

How do I convert mg to mL?

Divide the milligrams by the concentration in mg per mL. Without a concentration there is no single answer, because mg is a weight and mL a volume.

What is 100 mg in mL?

At 1 mg/mL it is 100 mL; at 10 mg/mL it is 10 mL. The concentration decides the volume.

Is 1 mg the same as 1 mL?

Only when the concentration is exactly 1 mg/mL. That is the default here, but many liquids are more concentrated.

Why do I need a concentration?

Milligrams weigh the substance while millilitres measure the liquid it sits in, so only the concentration ties the two together.

Is mg/mL the same as mg/cc?

Yes, because a millilitre and a cubic centimetre are the same volume, so the two are interchangeable.

Quick facts
Link
concentration (mg/mL)
At 1 mg/mL
100 mg = 100 mL
mL
= cc
Result
scales with concentration