mg, mcg, mL and units converter
Convert between mg, mcg, mL and units on a U-100 insulin syringe. Going between an amount and units needs your vial’s strength, because a unit measures volume, not drug.
Convert
Convert to
Your vial’s strength
1 mg is 20 units.
1 mg is
20units
at 5 mg/mL
- In mcg
- 1,000 mcg
- In mL
- 0.2 mL
Show the math
mg to mL
1 mg ÷ 5 mg/mL equals 0.2 mL
mL to units
0.2 mL × 100 equals 20 units
This is arithmetic, not medical advice. Confirm with your prescriber or pharmacist.
How our calculator worksUnits depend on concentration
“Units” on an insulin syringe are marks of volume: 100 units fill 1 mL. How much drug sits in those units depends on how concentrated your vial is, so the same 1 mg can be 10, 20 or 40 units.
units = mg ÷ mg/mL × 100
mg = units ÷ 100 × mg/mL
Don’t know the strength of a vial you mixed? It’s the mg in the vial divided by the mL of water. The peptide calculator works it out and takes your dose straight to units.
mcg to mg table
1 mg is 1,000 mcg. Divide mcg by 1,000 to get mg.
| mcg | mg |
|---|---|
| 100 | 0.1 |
| 250 | 0.25 |
| 500 | 0.5 |
| 750 | 0.75 |
| 1,000 | 1 |
| 2,500 | 2.5 |
mL to units on a U-100 syringe
Multiply mL by 100. This part never depends on the drug or the vial.
| mL | Units |
|---|---|
| 0.05 | 5 |
| 0.1 | 10 |
| 0.25 | 25 |
| 0.3 | 30 |
| 0.5 | 50 |
| 1 | 100 |
Reading those units on the barrel is its own skill: see how to read an insulin syringe.
Questions people ask
How many units is 1 mg?
It depends on your vial’s strength, because a unit measures volume (0.01 mL), not drug. Units = mg ÷ mg/mL × 100. At 5 mg/mL, 1 mg is 20 units; at 10 mg/mL it’s 10 units; at 2.5 mg/mL it’s 40 units. Enter your strength above, or the vial mg and water, to get yours.
How do I convert units to mg?
Turn the units into mL, then multiply by the strength: mg = units ÷ 100 × mg/mL. For example, 20 units at 5 mg/mL is 0.2 mL × 5 = 1 mg. Without the strength there’s no way to tell, so the converter asks for it whenever you go between an amount and units.
How many mL is 100 units?
On a U-100 insulin syringe, 100 units is 1 mL, so each unit is 0.01 mL. 50 units is 0.5 mL and 30 units is 0.3 mL: exactly the capacity of the 50 and 30-unit syringes. Other syringe types (U-40, U-500) use different scales; this converter is for U-100 only.
How many units is 35 micrograms?
That depends on the strength too. First find what one unit holds: mcg per unit = mg/mL × 10. At 1 mg/mL each unit holds 10 mcg, so 35 mcg is 3.5 units. At 2.5 mg/mL each unit holds 25 mcg, so it’s 1.4 units, which is too small to measure reliably on an insulin syringe.
Can Peptinote tell me how many units to take?
No. Peptinote never suggests a dose. Enter the dose your prescriber gave you, and the calculator shows how to measure it: the units, the mL and where the line sits on your syringe, with every step of the math. If you aren’t sure what your dose is, ask your prescriber or pharmacist before drawing anything. How our calculator works.
Related
Calculators
Guides
Every result is plain arithmetic from formulas we publish in full and check with automated tests. Peptinote doesn’t suggest doses and never sells or links to sellers of peptides.