How many units is 500 mcg?
500 mcg is 20 units on a U-100 insulin syringe when the solution is 2.5 mg/mL (5 mg mixed with 2 mL of water). The number changes with the concentration, so check your own mix against the table below.
500 mcg in units at every common concentration
| Concentration | Made by mixing | Units | Volume |
|---|---|---|---|
| 1 mg/mL | 2 mg in 2 mL, or 5 mg in 5 mL | 50 units | 0.5 mL |
| 2 mg/mL | 10 mg in 5 mL | 25 units | 0.25 mL |
| 2.5 mg/mL | 5 mg in 2 mL | 20 units | 0.2 mL |
| 3.33 mg/mL | 10 mg in 3 mL | 15 units | 0.15 mL |
| 5 mg/mL | 5 mg in 1 mL, or 10 mg in 2 mL | 10 units | 0.1 mL |
| 10 mg/mL | 10 mg in 1 mL, or 20 mg in 2 mL | 5 units | 0.05 mL |
How do you work out the units for 500 mcg?
- Find your concentration: the peptide in the vial divided by the water you added. 5 mg in 2 mL is 2.5 mg/mL.
- Convert to micrograms per unit: multiply by 1,000, then divide by 100. 2.5 mg/mL is 25 mcg per unit.
- Divide the amount by that figure: 500 mcg divided by 25 is 20 units.
Or let the mcg to units converter do it from your own vial and water.
What to watch for with 500 mcg
- 500 mcg is 0.5 mg. Vials are labelled in milligrams while amounts are often discussed in micrograms, so converting both to the same unit first avoids a thousandfold error.
Common questions
How many units is 500 mcg on an insulin syringe?
It depends on the concentration of the solution. At 2.5 mg/mL (5 mg mixed with 2 mL of water), 500 mcg is 20 units on a U-100 syringe. At 5 mg/mL it is 10 units, and at 1 mg/mL it is 50 units.
How do I convert 500 mcg to units myself?
Multiply the concentration in mg/mL by 1,000 to get micrograms per mL, divide by 100 to get micrograms per unit on a U-100 syringe, then divide 500 mcg by that figure. At 2.5 mg/mL that is 25 mcg per unit, so 500 divided by 25 is 20 units.
Is 500 mcg a recommended amount?
No. This page converts an amount into syringe units; it does not suggest that anyone take it. Whether and how much of any substance to use is a decision for you and a licensed clinician.
Unit conversion only. This page does not recommend an amount of any substance and is not medical advice.
PepCue does this conversion for every vial you log, so you never re-derive it. Free on iPhone and Android.