Peptide Calculator — reconstitution & syringe units
PepExact converts vial size, water volume, and a user-supplied target amount into concentration, draw volume, and U-100 syringe units — with every step shown. It does not choose a dose or recommend a peptide.
- Free · no login
- Every step shown
- Nothing to sell you
Calculate peptide measurements
Exact draw
10units
U-100 · 0.1 mL
Concentration
2.5 mg/mL
2,500 mcg/mL
Volume per dose
0.1 mL
Doses in this vial
20
at 250 mcg each
Show the math
- 1. Concentration: 5 mg ÷ 2 mL = 2.5 mg/mL (2,500 mcg/mL)
- 2. Volume for one dose: 250 mcg ÷ 2,500 mcg/mL = 0.1 mL
- 3. Syringe units (U-100): 0.1 mL × 100 units/mL = 10 units
- 4. Doses in the vial: 5,000 mcg ÷ 250 mcg = 20 full doses
Continue on your phone
PepExact for iPhone keeps the same vial numbers, draws the syringe marks, and works offline — the same measurement math as here.
What this peptide calculator calculates
A peptide reconstitution calculator applies the same unit-conversion formula regardless of the compound name. Enter values from an authorized product label, validated laboratory protocol, pharmacist, or licensed healthcare professional. PepExact does not select or recommend a target amount.
- Concentration — vial contents (mg) ÷ water added (mL) = mg per mL (also shown in mcg/mL).
- Draw volume — your target amount ÷ concentration = mL to draw.
- U-100 syringe units — mL × 100, because a U-100 syringe holds 100 units per mL.
(target mcg ÷ concentration in mcg/mL) × 100 = U-100 syringe units
mg vs mcg and common input errors
Milligrams and micrograms differ by a factor of 1,000: 1 mg = 1,000 mcg. Mixing them up is the most common arithmetic slip. Keep the dose-field unit switch set to whatever your number is actually written in. See the mg vs mcg guide and the mg to mcg converter.
- Assuming a water volume instead of entering the volume you used
- Using a non–U-100 syringe scale without converting
- Comparing results that used different rounding rules
If another tool disagreed with yours, read why calculators disagree. To solve for water from a target draw, use the reconstitution calculator. For unit marks alone, see the syringe units calculator or the insulin syringe guide.
Popular compound calculators
Need compound-specific context? These pages use the same engine — only the educational copy changes:
- BPC-157 calculator — reconstitution & syringe units for BPC 157 measurement math
- Retatrutide calculator — also searched as reta peptide / peptide retatrutide
Common questions
How does a peptide calculator work?
It is three steps of arithmetic. First, concentration: the mg in the vial divided by the mL of water added. Second, volume: your dose divided by that concentration. Third, syringe units: volume in mL multiplied by 100, because a U-100 insulin syringe holds 100 units per mL.
How many units is my dose?
It depends entirely on how much water was added to the vial. Example: a 5 mg vial reconstituted with 2 mL of water is 2.5 mg/mL. A 250 mcg dose is then 0.1 mL, which is 10 units on a U-100 syringe. The same dose from the same vial with 1 mL of water would be 5 units. PepExact does not recommend that example amount — it only illustrates the arithmetic.
What syringe do the units refer to?
U-100 insulin syringes, the most common type. U-100 means 100 units per mL, so 1 unit is always 0.01 mL — whether the syringe is a 0.3 mL, 0.5 mL, or 1.0 mL size.
Why do different peptide calculators give different answers?
Usually rounding, unit confusion (mg vs mcg), or assumptions about syringe type. PepExact shows every step of the working so you can verify the number rather than trust it blindly.
All compound calculators
Same calculator, same engine — the math is identical; only the heading and context change.
Related tools & guides
PepExact is a measurement tool, not medical advice. It never suggests what or how much to take — it only does the arithmetic on numbers you already have. It does not verify identity, purity, sterility, legality, or approval. See methodology and editorial policy.