Units on a U-100 syringe
How many units is 500 mcg?
It depends on the concentration. With a 5 mg vial and 2 mL of water, 500 mcg is 20 units (0.2 mL). With a 10 mg vial and 2 mL, it’s 10 units.
Find your vial and water below, or enter your own numbers in the calculator.
500 mcg in units, by vial and water
| Vial | 1 mL water | 2 mL water | 3 mL water |
|---|---|---|---|
| 2 mg | 25units | 50units | 75units |
| 5 mg | 10units | 20units | 30units |
| 10 mg | 5units | 10units | 15units |
| 15 mg | 3.3units | 6.7units | 10units |
| 20 mg | 2.5units | 5units | 7.5units |
| 30 mg | 1.7units | 3.3units | 5units |
100-unit (1 mL) insulin syringe. “Won’t fit” = over 100 units; “hard to read” = under 1 unit.
Your numbers
On a 100-unit (1 mL) insulin syringe
Draw to 20 units
= 0.2 mL
How it’s calculated
Concentration
5 mg ÷ 2 mL = 2.5 mg/mL
One unit
2.5 mg/mL × 10 = 25 mcg per unit
500 mcg
500 mcg ÷ 25 = 20 units
Stop redoing this math.
Peptide Vault saves the calculation with your vial, logs every dose, and reminds you on schedule. iPhone, on-device.
FAQ
How many units is 500 mcg on an insulin syringe?
It depends on how the vial was mixed. With a 5 mg vial and 2 mL of water (2.5 mg/mL, 25 mcg per unit), 500 mcg is 20 units. With a 10 mg vial and 2 mL it is 10 units. Use the table or the calculator for your vial.
How many mg is 500 mcg?
500 mcg is 0.5 mg (1,000 mcg = 1 mg).
How many mL is 500 mcg?
Volume depends on concentration too. At 2.5 mg/mL (5 mg in 2 mL) 500 mcg is 0.2 mL; at 5 mg/mL (5 mg in 1 mL) it is 0.1 mL.
Why does more water mean more units?
The vial holds the same total either way. More water spreads it thinner, so each unit carries less and you need more units for the same amount.
Is this a recommendation?
No. 500 mcg is used here as an example amount for arithmetic. Peptide Vault does not recommend amounts; follow your prescriber or pharmacist.