Tool
Peptide Calculator
Work out how far to draw an insulin syringe after a vial has been reconstituted with bacteriostatic water. Enter your own numbers. The calculator does arithmetic only.
This tool does arithmetic only. It does not recommend any peptide, amount, schedule or water volume, and it is not medical advice. Check every result yourself before relying on it, and follow the guidance of a licensed healthcare professional.
Several peptides in one vial? Use the blend calculator.
Results
Pick or type the vial amount, the amount per draw and the water volume. The results build as you go.
Draw the syringe to — units
- Volume per draw
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- Concentration
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- Peptide per syringe unit
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- Full draws per vial
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Usage planner
- One vial lasts
- Vials per month
- Estimated run-out date if started today
Download your reference sheet
A letter-size PDF with everything this site has on the peptide you chose, plus your mix numbers.
Your browser opens its print window. Choose Save as PDF as the destination.
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How the calculator works
- Concentration (mg/mL) = peptide in the vial (mg) ÷ water added (mL)
- Volume to draw (mL) = amount per draw (mg) ÷ concentration (mg/mL)
- Syringe units = volume (mL) × 100, because a standard insulin syringe has 100 units per mL
Worked example, for illustration only: a 10 mg vial with 2 mL of water has a concentration of 5 mg/mL. A 1 mg draw is 0.2 mL, which is 20 units.
Calculator questions
What is a unit on an insulin syringe?
A unit is one hundredth of a millilitre on a standard U-100 insulin syringe. 100 units equal 1 mL, whatever the barrel size. A 0.3 mL syringe holds 30 units, a 0.5 mL syringe holds 50 units and a 1.0 mL syringe holds 100 units.
Why does the water volume matter?
The same amount of peptide in more water is more dilute, so a given amount takes up more volume and reads as more units on the syringe. The water volume changes the volume you draw, not the amount of peptide in the vial.
What is the difference between mcg and mg?
1 mg equals 1,000 mcg (micrograms). Mixing the two up is a common source of error, so the calculator shows your amount in mcg as you type.
What is bacteriostatic water?
Sterile water that contains 0.9% benzyl alcohol, which limits bacterial growth in a vial that is punctured more than once. Sterile water without a preservative is meant for a single use.
Does the calculator tell me how much to use?
No. It converts numbers you enter. It does not suggest a peptide, an amount, a schedule or a water volume. Questions about use belong with a licensed healthcare professional.
Is this reference for human use?
This site is for educational and entertainment purposes only. Many peptides are unapproved or are sold labelled for research only, and nothing here recommends use in people.
Several peptides in one vial? Use the blend calculator. · Browse the peptide A-Z