PepSync

Peptide dose calculator

Use this page to convert a target peptide dose into a draw volume and syringe units. It is best when you already know the vial concentration or want a quick dose-volume check.

  • Free, no sign-up
  • Formula shown below
  • U-100 syringe units

Peptide dose calculator

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On the vial label
mg
Amount you add
mL
What you plan to take
Syringe sizeU-100 insulin syringe
The PepSync app

Track every peptide dose in one place.

Save your peptides, mixes and schedule, and get a reminder when each dose is due.

  • Saved calculationsEvery vial and dose one tap away. No more screenshots.
  • Schedules & remindersDaily, weekly or custom. Get a nudge when it’s time.
  • Titration plansStep your dose up over weeks with the draw worked out for each step.
  • Dose logSee what you took and when, and how much is left in the vial.
“User friendly. Easy to navigate and understand.”
jusPeaches · App Store review · United States
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The PepSync app home screen with saved peptides and today’s doses
App Store rating
4.9
calculations run
428,000+
peptides supported
100s
Built with research from
  • World Health Organization
  • University of Oxford
  • Harvard Medical School

Built with clinicians · No data leaves your device

How your peptide draw is calculated

  1. 1Find the concentration

    5 mg × 1,000 ÷ 2 mL
    = 2,500 mcg/mL

  2. 2Work out the volume

    250 mcg ÷ 2,500 mcg/mL
    = 0.10 mL

  3. 3Convert to units

    0.10 mL × 100
    = 10 units

On a U-100 insulin syringe, 100 units equals 1 mL, so each unit is 0.01 mL. The 0.3 mL (30 unit) and 0.5 mL (50 unit) syringes use the same scale, just shorter, which makes small doses easier to read.

Core inputs
Concentration + target dose
Core outputs
mL and syringe units
Best for
Repeat dose checks
Educational reference only. Not medical advice — follow the instructions from your clinician or pharmacy.

How dose volume is calculated

Dose volume is calculated by dividing your target dose by the concentration of the vial. The result is the amount of liquid to draw for that dose.

Syringe units are a second conversion from mL to the markings on your syringe. The same mL volume can show a different unit number on different syringe scales.

  • Target dose / concentration = mL to draw
  • mL x 100 = U-100 units
  • mL x 50 = U-50 units

10 units equals how many mL?

Units are syringe markings, so the mL answer depends on the syringe scale. On a U-100 syringe, 10 units is 0.1 mL.

On a U-50 syringe, 10 units is 0.2 mL. On a U-40 syringe, 10 units is 0.25 mL.

  • U-100: 10 units = 0.1 mL
  • U-50: 10 units = 0.2 mL
  • U-40: 10 units = 0.25 mL

50 units to mg depends on concentration

On a U-100 syringe, 50 units is 0.5 mL. That still does not tell you the peptide amount until concentration is known.

If the vial is 2.5 mg/mL, then 0.5 mL contains 1.25 mg. If the vial is 5 mg/mL, then 0.5 mL contains 2.5 mg.

  • 50 U-100 units = 0.5 mL
  • 0.5 mL x 2.5 mg/mL = 1.25 mg
  • 0.5 mL x 5 mg/mL = 2.5 mg

Useful for units-to-mg questions

Many search questions start with a unit marking such as 10 units, 25 units, or 50 units. The safe way to interpret that number is to tie it back to concentration and syringe type.

If either concentration or syringe type is unknown, the unit number alone is not enough to identify a dose.

Frequently asked questions

Can I convert units to mg without concentration?
No. Units describe volume on a syringe, not peptide mass. You need the vial concentration before units can be converted into mg or mcg.
Is 50 units always the same dose?
No. On a U-100 syringe, 50 units is 0.5 mL, but the peptide dose depends on how concentrated the vial is.
What if the draw is larger than my syringe?
Re-check the vial concentration, target dose, and syringe capacity. Do not split or change a dose unless that matches your clinician, pharmacy, or product instructions.
From PepSync users

Dosing with confidence.

  • “Very good and accurate… shows you a diagram of where to pin. Very easy to use and very beginner friendly if you’re starting off.”
    jesaiah685 · App Store review · Australia
  • “User friendly. Easy to navigate and understand.”
    jusPeaches · App Store review · United States
  • “Well put together. Nice friendly layout.”
    Crowleyboy666 · App Store review · United Kingdom
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Never redo the math on your next vial.

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