5 mg in 2 mL
At most 2.500 mg/mL, which puts 250.0 mcg in each tenth of a millilitre. A 500 mcg amount is at least 0.200 mL, which is at least 20.00 units on a U-100 barrel.
Educational arithmetic only. Not medical advice and not a dosing protocol.
| Expressed as | At most |
|---|---|
| Milligrams per millilitre | 2.500 mg/mL |
| Micrograms per millilitre | 2500.0 mcg/mL |
| Micrograms in a tenth of a millilitre | 250.0 mcg |
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.
| Amount | At least, mL | At least, µL | U-100 | U-50 | U-40 |
|---|---|---|---|---|---|
| 100 mcg | 0.040 | 40 | 4.00 | 2.00 | 1.60 |
| 250 mcg | 0.100 | 100 | 10.00 | 5.00 | 4.00 |
| 500 mcg | 0.200 | 200 | 20.00 | 10.00 | 8.00 |
| 750 mcg | 0.300 | 300 | 30.00 | 15.00 | 12.00 |
| 1 mg | 0.400 | 400 | 40.00 | 20.00 | 16.00 |
| 1.5 mg | 0.600 | 600 | 60.00 | past the barrel | 24.00 |
| 2.5 mg | 1.000 | 1000 | 100.00 | past the barrel | 40.00 |
What is particular to this pair
The single most common arrangement in this category, and the one most worked examples are built on. At 2.5 mg/mL a tenth of a millilitre holds 250 mcg, 250 mcg is exactly ten units on a U-100 and 500 mcg is exactly twenty - draws that land on printed marks rather than between them.
The reason this arrangement is everywhere is the second column of the table below. Two hundred and fifty micrograms is a tenth of a millilitre, five hundred is two tenths, a milligram is four tenths: the whole useful range falls on round fractions of the barrel, and round fractions of a U-100 barrel are printed marks.
Why the figures above say "at most" and "at least"
The finished solution is 2 mL of diluent plus the room the dissolved solid takes up, and nobody measured the second part. So the finished volume is at least 2 mL, the strength is at most 2.500 mg/mL, and every volume derived from it is at least the figure shown - which is the useful direction, because it means a reader drawing one has not drawn more than intended.
Why a derived strength is a ceiling covers the size of the gap, and vial into a strength has a field for the measured finished volume that removes the question.
The same vial, other ways in
- The other eleven pairs
Same two tables, a different mass and a different diluent volume.
- The 2.5 mg/mL page
The same strength, treated as a figure off a label rather than as something derived.
- The calculator itself
Any vial, any diluent, any amount.