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HCG Calculator

A vial of N USP units, a water volume and a dose in USP units give the mark on the syringe. The unit cancels, so no conversion to milligrams is involved — and none is offered, because the milligram-to-unit conversion that exists for somatropin does not exist for HCG.

Last reviewed: September 21, 2026

A vial of N USP units, a water volume and a dose in USP units give the mark on the syringe. The unit cancels, so no mass conversion is involved.

Read it off the vial. Strengths Prof. Peptide has read from a label: 10000 USP units.

How the arithmetic works

  • Draw volume (mL) = (dose in USP units ÷ vial strength in USP units) × water volume (mL)
  • Syringe units = draw volume (mL) × 100, on a U-100 insulin syringe

The USP unit cancels out of this arithmetic when the vial strength and dose are both expressed in it, which is why no milligram figure enters the calculation at all.

Worked example

A 10,000 USP unit vial reconstituted with 2 mL of water, for a 500 USP unit dose:

Draw volume(500 ÷ 10,000) × 2 mL = 0.1 mL
Syringe units0.1 mL × 100 = 10 units

Enter the same three numbers into the calculator above and it returns the same figures.

What changes the answer

  • Water volume. More water lowers the concentration, raising the syringe-unit count for the same USP-unit dose; less water does the reverse.
  • Vial strength. This page offers 10,000 USP units as a one-tap figure because that is the strength Prof. Peptide has read on a label; other strengths (5,000 USP units, for instance) can be typed in directly.

FAQ

How many syringe units is 500 IU of HCG?
It depends on the vial's own USP-unit strength and how much water it was reconstituted with. For a 10,000 USP unit vial mixed with 2 mL of water, a 500 USP unit dose draws 0.1 mL, which reads as 10 units on a U-100 syringe. A different vial strength or water volume changes the reading for the same 500 USP unit dose.
hcg calculator units to ml
This page's calculator takes a vial's strength in USP units, a water volume, and a dose in USP units, and returns the draw volume in mL and the mark it reaches on a U-100 syringe.
What HCG vial strength does this calculator use?
10,000 USP units per vial, the strength Prof. Peptide read directly off FDA prescribing information for a lyophilized HCG product reconstituted with bacteriostatic water. A 5,000-unit vial is commonly described elsewhere; no label for one has been read, so it isn't offered as a one-tap chip — the field still accepts any vial strength typed in directly.
Is there an HCG mg to units conversion?
Not on this page, and deliberately so. The 3.0 IU-per-mg figure used for somatropin (HGH) comes from the WHO's international standard for that specific hormone; HCG is a different hormone with no equivalent milligram conversion this page states. HCG's own strength is expressed only in USP units here.

For the reconstitution step itself — mixing the lyophilized powder with water before drawing a dose — see the HCG reconstitution calculator.