Between amount units
One of these conversions is pure definition and needs nothing from anybody. The other needs a figure off the label in front of you, and this page asks for it rather than guessing.
Educational arithmetic only. Not medical advice and not a dosing protocol.
Before you act on that number
This is educational arithmetic on figures entered by the reader. It is not medical advice, not a dosing protocol, and not a recommendation that anything be prepared, obtained or administered.
Nothing here states what quantity is appropriate for anyone, and there is no function in it that produces an amount to administer. A question about anyone’s health belongs with a licensed clinician who can examine the person asking.
Compounds of the kind this arithmetic is used on are largely research chemicals that are not approved by the FDA for human use. An exact calculation is not an accurate measurement: what is actually in a syringe depends on the preparation and the device, neither of which this page can see.
No qualified clinical reviewer is recorded against this site, and no credential is claimed anywhere on it. what this is not, at full length.
| From | To | Multiply by |
|---|---|---|
| 1 g | mg | 1,000 |
| 1 mg | mcg | 1,000 |
| 1 mcg | ng | 1,000 |
| 1 mg | ng | 1,000,000 |
| 1 L | mL | 1,000 |
| 1 mL | µL | 1,000 |
Milligrams and micrograms are where the real mistakes happen
Both units are in constant use on the same page: vials are labelled in milligrams, amounts are discussed in micrograms, and they differ by a factor of a thousand. Both numbers are small, both are plausible, and an answer computed from the wrong one looks exactly as confident as a correct one.
So the unit is part of every field on this site rather than an assumption behind it, conversions are exact integer multiplications, and asking to convert micrograms into millilitres gets a refusal instead of a number: that conversion needs a strength, and inventing one would be worse than declining. The factor of a thousand covers this at length.
Why there is no table of international units here
An international unit measures biological activity against a reference preparation, one substance at a time. It is not a mass and has no mass equivalent that holds across substances, or even across two formulations of the same substance. The IU-per-milligram figure belongs to the specific preparation it was assayed in.
A converter carrying a built-in table of those figures would be making a claim about a vial it has never seen, maintained by nobody. So the potency is a field, and the useful side effect is that filling it in means reading the label.