Peptide Reconstitution Calculator (mg/mL and Syringe Units)
Free peptide reconstitution calculator: enter the vial's mg and the liquid added to get the concentration, mcg per syringe unit, and the mL and U-100 or U-40 units for a target amount.
This calculator checks arithmetic only. It is not medical advice and does not recommend any amount. Research-use products are not intended for human use; follow the prescribing information for any medication.
How the math works
- Concentration = amount in vial ÷ liquid added. 10 mg in 2 mL is 5 mg/mL, or 5,000 mcg/mL.
- Per syringe unit: a U-100 syringe has 100 unit marks per mL, so one unit is 0.01 mL. At 5,000 mcg/mL, one unit holds 50 mcg. A U-40 syringe has 40 units per mL, so each unit is 0.025 mL.
- Volume for a target amount = target ÷ concentration. 250 mcg at 5,000 mcg/mL is 0.05 mL, which is 5 units on a U-100 syringe.
Adding more liquid lowers the concentration, so each unit holds less and the same amount takes more units. The conversions guide covers mg, mcg and IU in more depth.
FAQ
How do I calculate peptide concentration after reconstitution?
Divide the amount in the vial by the volume of liquid added. 10 mg in 2 mL is 5 mg/mL, which is 5,000 mcg/mL or 50 mcg per unit on a U-100 syringe.
How many mL is one unit on an insulin syringe?
On a U-100 syringe, 100 units equal 1 mL, so one unit is 0.01 mL. On a U-40 syringe one unit is 0.025 mL.
How many units is 250 mcg?
It depends on the concentration. At 5 mg/mL (10 mg in 2 mL), 250 mcg is 0.05 mL, or 5 units on a U-100 syringe. At 2.5 mg/mL (10 mg in 4 mL) it is 10 units.