Peptide Vial Math

KPV dosage calculator

10 mg + 2 mL = 5 mg/mL, so 500 mcg is 0.1 mL, or 10 units on a U-100 syringe. Change the vial, the water or the amount and the syringe updates.

Also called: Lys-Pro-Val, α-MSH (11–13), KPV dosage calculator, KPV reconstitution calculator.

By Peptide Vial Math Editorial Team Reviewed by the team on (how we review) Updated Formulas unit-tested (methodology)

KPV reconstitution calculator

Vial mg, water mL and amount give syringe units

mg

Total printed on the vial label.

mL

Diluent volume you add (1 mL = 100 units on a U-100 syringe).

Amount unit

The mass you want in one draw. 1 mg = 1,000 mcg.

Syringe barrel
Show U-40 and U-50 syringes

Result

10units

to draw on a U-100 syringe, 100-unit barrel

Vial: 10 mg with 2 mL diluent 10 mg +2 mL
Syringe filled to 10.0 of 100 units 0 10 20 30 40 50 60 70 80 90 100 U-100, 1 mL
Volume
0.1 mL
Concentration
5 mg/mL
Per unit
50 mcg
Draws per vial
20

10 mg + 2 mL = 5 mg/mL, so 500 mcg is 0.1 mL, or 10 units on a U-100 syringe.

Arithmetic only. Not a dosing recommendation. Check every figure against your vial label and lab protocol.

How many units is each KPV amount?

At 10 mg + 2 mL (5 mg/mL) on a U-100 syringe:

Generated from the calculator's own functions. Rows are evenly spaced reference amounts, not suggested amounts. Amber readings don't fit a 100-unit barrel.

KPV: 10 mg + 2 mL = 5 mg/mL, U-100 syringe
AmountmgVolume (mL)Syringe units
100 mcg 0.1 0.02 2
200 mcg 0.2 0.04 4
250 mcg 0.25 0.05 5
300 mcg 0.3 0.06 6
400 mcg 0.4 0.08 8
500 mcg 0.5 0.1 10
750 mcg 0.75 0.15 15
1,000 mcg 1 0.2 20
Engraving of glass burettes, one with a dark strip behind its graduation to make the tick marks easier to read
A burette with a dark strip behind its graduation, 1895. Pick a water volume that lands your reading on a printed mark. Public domain.

How much water for each KPV vial size?

KPV is sold in one common size (10 mg). The same water volume gives a different concentration in each, so the same reading means a different amount. Each cell shows mcg per unit with mg/mL in brackets.

KPV: mcg per U-100 unit (mg/mL in brackets) by vial size and water added
Vial1 mL2 mL3 mL
10 mg 100 (10)50 (5)33.33 (3.33)

How much bacteriostatic water for a 10 mg KPV vial?

1 mL → 10 mg/mL, so 500 mcg is 5 units. 2 mL → 5 mg/mL, so 500 mcg is 10 units. 3 mL → 3.33 mg/mL, so 500 mcg is 15 units. The whole vial holds 20 draws of 500 mcg.

Worked example: 10 mg vial, 2 mL, 500 mcg

  1. Concentration. 10 mg ÷ 2 mL = 5 mg/mL (5,000 mcg/mL).
  2. Volume. 0.5 mg ÷ 5 mg/mL = 0.1 mL.
  3. Units. 0.1 mL × 100 = 10 units on a U-100 syringe.
  4. Check. One unit holds 50 mcg; 10 × 50 mcg = 500 mcg = 0.5 mg, which matches. The vial holds 20 draws of this size.

KPV: notes for the arithmetic

KPV is a tripeptide, so a milligram contains many more molecules than a milligram of a large peptide. The calculator works in mass, not moles; use the molecular weight below if your protocol is written in molar terms.

For the lab procedure itself (materials, aseptic technique, mixing without foaming) see how to reconstitute peptides. For what bacteriostatic water is and how long an opened vial is kept, see the bacteriostatic water guide and the storage guide.

Frequently asked questions

How many units is 500 mcg of KPV?

It depends on the water volume. 10 mg + 2 mL = 5 mg/mL, so 500 mcg is 0.1 mL, or 10 units on a U-100 syringe. With 1 mL instead it would be 5 units.

How much bacteriostatic water for a 10 mg KPV vial?

There is no single correct volume. 1 mL gives 10 mg/mL (100 mcg per unit); 2 mL gives 5 mg/mL (50 mcg per unit); 3 mL gives 3.33 mg/mL (33.33 mcg per unit). Pick the volume that makes your reading easy to measure on the barrel you have.

How many mg of KPV is 10 units?

10 units on a U-100 syringe is 0.1 mL. At 5 mg/mL (10 mg in 2 mL) that is 0.5 mg (500 mcg). At a different concentration the answer is different.

Is this a KPV dosing calculator?

It is an arithmetic tool. It converts an amount you enter into a volume and a syringe reading; it does not suggest amounts, schedules or uses. Not approved by the FDA for any use. Sold as a research chemical only.

Sources

  1. FDA alerts health care providers, compounders and patients of dosing errors associated with compounded injectable semaglutide products — U.S. Food and Drug Administration, 2024

Links checked 2026-10-19.