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Peptide Dosage Calculator

For an already mixed vial: enter your vial amount, water volume, and desired amount to see the U-100 syringe mark.

Your inputs

Enter your vial amount, water volume, and desired amount.

mg
mL

U-100 calibration: 1 unit = 0.01 mL, 100 units = 1 mL.

Live measurement

Enter your values

See the concentration and what units to draw.

— mL

Concentration—
Liquid volume—
U-100 mark—

How the peptide dosage calculator works

First, the tool divides total peptide amount by liquid volume to find concentration in mg/mL. Then it converts the amount you entered into mL. A U-100 syringe turns that liquid volume into a scale mark: 100 units equals 1 mL.

  1. Step 1 — Concentration

    Concentration (mg/mL) = Peptide amount (mg) ÷ Water volume (mL)

  2. Step 2 — Dose volume

    Volume to draw (mL) = Desired dose (mg) ÷ Concentration (mg/mL)

  3. Step 3 — Syringe units

    U-100 units = Volume to draw (mL) × 100

Worked examples

5 mg peptide + 2 mL BAC water

  • Concentration: 5 ÷ 2 = 2.5 mg/mL
  • Dose: 250 mcg (0.25 mg)
  • Volume to draw: 0.25 ÷ 2.5 = 0.1 mL
  • Syringe units: 0.1 × 100 = 10 units

Example only — not a dose recommendation.

5 mg peptide + 1 mL BAC water

  • Concentration: 5 ÷ 1 = 5 mg/mL
  • Dose: 250 mcg (0.25 mg)
  • Volume to draw: 0.25 ÷ 5 = 0.05 mL
  • Syringe units: 0.05 × 100 = 5 units

Example only — not a dose recommendation.

10 mg peptide + 2 mL BAC water

  • Concentration: 10 ÷ 2 = 5 mg/mL
  • Dose: 500 mcg (0.5 mg)
  • Volume to draw: 0.5 ÷ 5 = 0.1 mL
  • Syringe units: 0.1 × 100 = 10 units

Example only — not a dose recommendation.

Each card follows the same sequence, but the concentration changes when either the total peptide amount or the recorded water volume changes. The first two cards keep the total at 5 mg and change only the water volume. Moving from 2 mL to 1 mL doubles the concentration from 2.5 mg/mL to 5 mg/mL, so the same 250 mcg amount becomes half as much liquid and half as many U-100 units.

The second and third cards share a 5 mg/mL concentration even though their vial totals and water volumes differ. Their entered amounts then lead to different liquid volumes, while both happen to land at 10 units. This is why the vial label and recorded liquid volume belong together: neither number alone tells you the U-100 mark.

The calculation starts with the exact numbers for the vial you are reading, carries units through each step, and finishes with a scale mark. Keeping each unit visible makes the calculation easier to review, compare, and check against the vial label. The figures in these cards are arithmetic examples, not defaults for a vial or instructions for use.

Understanding peptide measurements

Peptide labels commonly use milligrams (mg) and micrograms (mcg), two units that describe the amount of material rather than the liquid volume. One milligram equals 1,000 micrograms, so a 250 mcg entry is the same amount as 0.25 mg. The amount printed on a vial is its total peptide amount. The water volume is a separate number: it tells the calculator how much liquid carries that total amount after reconstitution. Together, those two values create concentration, expressed as mg/mL.

This page then changes liquid volume into the markings on a U-100 syringe. On a U-100 scale, 1 mL is 100 units, so one unit represents 0.01 mL. That relationship is fixed for the U-100 scale; a U-40 syringe uses a different scale and is not interchangeable. Check the marking on the syringe you are reading before using any unit conversion.

Vials are often labelled with total amounts such as 2 mg, 5 mg, or 10 mg. The amount of water recorded for that vial changes the concentration. That is why the same 250 mcg amount can correspond to a different mL volume and a different U-100 mark when the vial amount or water volume differs. The worked examples above show the sequence: first read the total mg and water mL, then calculate concentration, then convert the amount you entered into mL and U-100 units. They demonstrate the arithmetic only; the calculator does not choose an amount, a water volume, or a syringe for you.

The calculator on this page works with the total peptide amount printed on your vial and the water volume you recorded after mixing. It does not assume a default vial size or a standard amount of water, so the three values you enter can describe many different products and research protocols. Enter your vial amount, recorded water volume, and amount to convert to see the matching mL and U-100 units.

Changing any of the three numbers changes the final mark. The result is only the math for the values you enter.

Need reference ranges? See the peptide dosage chart →

Peptide Dosage Calculator FAQ

How do I calculate my peptide concentration after reconstitution?

Divide the total peptide amount in mg by the liquid volume in mL. For example, a 5 mg vial with 2 mL of water gives you 2.5 mg/mL (5 ÷ 2 = 2.5). The calculator does this step automatically from your vial numbers.

My vial is 5 mg and I added 2 mL — how many units is 250 mcg?

At 5 mg / 2 mL, your concentration is 2.5 mg/mL. 250 mcg = 0.25 mg. 0.25 mg ÷ 2.5 mg/mL = 0.1 mL. On a U-100 syringe, 0.1 mL = 10 units. Enter those numbers into the calculator above to see the same result.

How many mL is a dose of 500 mcg at 2.5 mg/mL?

500 mcg = 0.5 mg. 0.5 mg ÷ 2.5 mg/mL = 0.2 mL. On a U-100 syringe, that is 20 units. The calculator converts the mg or mcg you enter directly to mL and units.

U-100 syringe — what does "units" mean?

A U-100 insulin syringe is marked so that 100 units = 1 mL. Each unit is 0.01 mL. The calculator uses this fixed conversion: mL × 100 = units. It works for 0.3 mL (30-unit), 0.5 mL (50-unit), and 1 mL (100-unit) syringes.

Is this calculator for already-mixed vials only?

Yes — this page is for vials you have already reconstituted. If your peptide is still a dry powder, use the peptide reconstitution calculator instead to work out your BAC water volume and concentration first. Then come back here for the dose math.

Is this medical advice?

No. This calculator performs mathematical conversions from the numbers you enter. It does not select a dose, product, schedule, or method of use. All information is for research reference only.

Disclaimer: For research purposes only. This tool performs mathematical conversions from the values you enter. It does not provide medical advice, dosing recommendations, or default protocol values. All inputs must be confirmed from your own product documentation and verified protocol.