1. Find the concentration
Divide what's in the vial by the water you added.
mg in vial ÷ mL water = mg/mLFree reconstitution calculator
Peptide Reconstitution Calculator
Enter your vial amount, the water you added, and your dose. See exactly how many units to draw on a 30, 50, or 100-unit syringe.
Example values shown. Replace them with your own.
mL
Calculations use only the values you enter. PepLog doesn't recommend doses. Verify with your healthcare provider.
Calculated on your device. Your entries aren't saved or sent to us.
DRAW TO
10units
0.10 mL on a 100-unit syringe
Concentration2.5 mg/mL
Volume to draw0.10 mL
Doses per vial20
Illustration only. Results may fall between markings; verify the actual syringe's graduations.
How the math works
Three numbers. One clear answer.
2. Find the volume
Divide your dose by the concentration.
dose (mg) ÷ mg/mL = mL3. Convert to units
On U-100 insulin-style syringes, 100 units = 1 mL.
mL × 100 = units| Vial | Water | Dose | Draw to |
|---|---|---|---|
| 5 mg | 2 mL | 250 mcg | 10 units (0.10 mL) |
| 10 mg | 2 mL | 1 mg | 20 units (0.20 mL) |
| 5 mg | 1 mL | 500 mcg | 10 units (0.10 mL) |
| 2 mg | 1 mL | 100 mcg | 5 units (0.05 mL) |
Questions
Reconstitution FAQ
How many units is 1 mL?
On a standard insulin-style U-100 syringe, 1 mL equals 100 units, so 0.1 mL is 10 units. The 30, 50 and 100-unit U-100 syringes all use this scale; they just hold different amounts. These markings describe volume, not the potency of a peptide.
How do I convert mcg to mg?
1 mg equals 1,000 mcg. So 250 mcg is 0.25 mg. The calculator converts automatically when you switch units.
Does more water change my dose?
For the same entered dose, adding more water lowers the concentration, so you draw more units. The amount in each dose stays the same. This is a mathematical relationship, not a recommendation to change preparation instructions.
Does PepLog recommend doses?
No. The calculator only converts the values you enter. It doesn't provide medical advice or dosing guidance. Verify with your healthcare provider.