Peptide Calculator
Printed on the vial label.
1 mg = 1,000 mcg. Enter your own prescribed or planned amount.
Draw on your syringe
10units= 0.1 mL
- Concentration
- 2,500mcg/mL
- Each unit
- 25 mcg
- Doses per vial
- 20
- Vial lasts
- 2.9weeks
Want a rounder number to draw?
Show the math
- Concentration = 5 mg × 1,000 ÷ 2 mL = 2,500 mcg/mL
- Volume = 250 mcg ÷ 2,500 mcg/mL = 0.1 mL
- Units = 0.1 mL × 100 = 10 units (U-100: 100 units = 1 mL)
Calculators by peptide
Each page is pre-filled with the vial sizes that compound is usually sold in, plus a ready-made units table. Mixing several peptides in one vial? Use a blend calculator.
How the reconstitution math works
Find the concentration
Vial mg × 1,000 ÷ water mL = mcg per mL. Example: 5 mg ÷ 2 mL = 2,500 mcg/mL.
Work out the volume
Dose (mcg) ÷ concentration = mL to inject. Example: 250 ÷ 2,500 = 0.1 mL.
Convert to syringe units
mL × 100 = units on a U-100 syringe. Example: 0.1 mL × 100 = 10 units.
Need a printable version? See the peptide reconstitution chart, or convert between units, mL and mg, browse quick conversion charts or download the peptide cheat sheet PDF.
Frequently asked questions
How do I calculate how many units of peptide to draw?
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Divide the amount in the vial (in mcg) by the water you added (in mL) to get the concentration. Divide your dose by the concentration to get the volume in mL, then multiply by 100 to convert to units on a U-100 insulin syringe. Example: 5 mg in 2 mL is 2,500 mcg/mL, so a 250 mcg dose is 0.1 mL = 10 units.
How much bacteriostatic water should I add to a peptide vial?
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The amount of water does not change how much peptide you get; it only changes the concentration. More water means each dose is a larger, easier-to-measure volume. Most people use 1–3 mL. Use the "rounder number" suggestions above to pick a volume that makes your dose land on a whole tick mark.
What is a U-100 insulin syringe?
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A U-100 syringe is marked for a concentration of 100 units per mL, so 1 unit = 0.01 mL. They come in 0.3 mL (30 units), 0.5 mL (50 units) and 1 mL (100 units) sizes. The units on the barrel measure volume — they are not the same as mcg or mg of peptide.
How many mcg are in 1 unit?
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It depends on your concentration. One unit is 0.01 mL, so mcg per unit = concentration (mcg/mL) ÷ 100. A 10 mg vial mixed with 2 mL gives 5,000 mcg/mL, so each unit contains 50 mcg.
Can I use this for blends like KLOW or Wolverine?
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Yes. Use the blend calculator: enter the amount of each peptide in the vial and the dose of one of them, and it shows how much of every other component is in the same injection.
Is this calculator medical advice?
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No. It only does unit conversion with the numbers you enter. It does not recommend doses or assess safety. Many peptides sold online are not approved for human use. Talk to a licensed clinician.