Peptide calculator

Enter the vial size, the water you add and the amount you want. The calculator gives the concentration and the units to draw on a U-100 insulin syringe. It runs in your browser and stores nothing.

Also available as a free Chrome extension, so the calculator is one click away in your toolbar.

–Concentration (mg/mL)
–mcg per unit (0.01 mL)
–Units to draw (U-100)
–Volume (mL)

How the math works

Concentration is the milligrams in the vial divided by the millilitres of water: mg/mL = vial mg ÷ water mL. One unit on a U-100 syringe is 0.01 mL, so each unit holds mg/mL × 10 micrograms. To find the units for an amount, divide the amount in milligrams by the concentration and multiply by 100: units = (amount mg ÷ mg/mL) × 100.

Example: 10 mg mixed with 2 mL of water is 5 mg/mL, so each unit holds 50 mcg and 250 mcg is 5 units.

Reconstitution chart

Vial1 mL water2 mL water3 mL water

Each cell shows the concentration and the micrograms in one unit.

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