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Lab tools

Reconstitution calculator

Enter what is on your vial label, the bacteriostatic water you add and the amount you want to measure. The page works out the concentration, the volume and where it sits on your syringe, with exact arithmetic.

For research use only. Not for human use. Math tool only; not dosing advice.

Start calculating
  • Exact arithmetic
  • mg ⇄ mcg
  • U-100 & U-40
1Peptide in the vial

Fills in the vial size printed on our label. Blends use the total peptide content.

Our vial sizes

Any value works. Use the unit printed on the label.

2Bacteriostatic water added

The total volume of water you put in the vial.

3Amount to measure

You choose this number. The calculator does not suggest one.

4Syringe

U-100: 100 units = 1 mL on every barrel size. Marks every 1 unit (0.3 and 0.5 mL) or 2 units (1 mL); check your barrel.

Result

Draw to

Volume

—units

—mL

Fill in steps 1⁠–⁠3 to see the draw.

Concentration

—mg/mL

— mcg/mL

In each unit

—mcg

 

Show the working

    ≈ means the value is rounded for display. The syringe is drawn from the exact value.

    For research use only. Not for human use. Math tool only; not dosing advice.

    How the math works

    1. 01

      Concentration

      mcg in the vial ÷ mL of water = mcg per mL

    2. 02

      Volume

      amount ÷ concentration = mL

    3. 03

      Syringe units

      mL × 100 = U-100 units (× 40 on U-40)

    1 mg = 1,000 mcg. The calculator converts for you.

    Bacteriostatic water

    Sold separately, 10 mL vial. $15.00

    View bacteriostatic water →Lab supplies

    Questions, answered

    What does this calculator do?

    It does arithmetic only. It turns the amount on the vial label and the water you add into a concentration, then turns an amount you enter into mL and syringe units. It does not suggest amounts or protocols.

    What is the difference between mg and mcg?

    1 mg = 1,000 mcg, so a 10 mg vial holds 10,000 mcg. Mixing them up changes a result 1,000 times, so the calculator warns when a value looks like a unit mix-up.

    What is a U-100 unit?

    On a U-100 insulin syringe, 100 units = 1 mL, so 1 unit = 0.01 mL. This is the same on 0.3, 0.5 and 1 mL barrels; only the length of the scale changes.

    What about U-40 syringes?

    U-40 syringes are marked 40 units = 1 mL, so 1 unit = 0.025 mL. Never read a U-100 result on a U-40 syringe, or the other way round.

    Why does more water mean a bigger draw?

    The amount of peptide in the vial stays the same. More water spreads it through more liquid, so each mL holds less and the same amount takes more volume.

    Why does it say "between marks"?

    Each barrel is printed at fixed steps (every 1 unit on 0.3 and 0.5 mL, every 2 units on most 1 mL). If the exact result falls between two printed lines, the calculator tells you which two.

    How exact is it?

    Every result is worked out with exact fractions from the numbers you type and is rounded only for display (≈ marks a rounded value). Accuracy in the lab still depends on the label and on measuring the water accurately.

    Is it for human use?

    No. Peptsche products and this tool are for laboratory research use only. Nothing on this page is medical or dosing advice.

    For research use only. Not for human use. Math tool only; not dosing advice.