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HCG Reconstitution Calculator

Calculate HCG injection volumes. Note: HCG is measured in IU (international units). Pre-filled for a 5000 IU vial with 1ml BAC water (5000 IU/ml).

HCG uses IU (international units), not mcg/mg. In this calculator, enter your vial in mg (5 = 5000 IU vial), BAC water in ml, and dose in mcg (500 = 500 IU). The math is numerically equivalent.

Dose Reference Table

Pre-calculated for a 5mg vial + 1ml BAC water = 5,000 mcg/ml concentration. Using a 100-unit (1ml) insulin syringe.

Dose Inject Volume (ml) Syringe Units
100 IU 0.020 ml 2 units
250 IU 0.050 ml 5 units
500 IU 0.100 ml 10 units
1000 IU 0.200 ml 20 units
2500 IU 0.500 ml 50 units
5000 IU 1.000 ml 100 units

About HCG

HCG (Human Chorionic Gonadotropin) is a glycoprotein hormone produced naturally during pregnancy. It is measured in International Units (IU) rather than mcg/mg. HCG is FDA-approved for treating infertility in women and cryptorchidism (undescended testicles) in boys, and it is used in fertility treatments for both men and women.

HCG is commonly supplied in 5,000 IU or 10,000 IU vials. It must be reconstituted with bacteriostatic water before injection. For a 5,000 IU vial with 1ml BAC water, the concentration is 5,000 IU/ml. A 500 IU dose requires 0.1ml — 10 units on a 100-unit insulin syringe.

In fertility protocols, HCG is used to trigger ovulation in women or to stimulate testosterone production in men. It binds to LH (luteinizing hormone) receptors and mimics the action of LH. For men on testosterone replacement, HCG is sometimes used to maintain testicular function and size.

The reconstitution math is the same as other peptides — concentration = total IU ÷ BAC water volume, injection volume = desired IU ÷ concentration.

Frequently Asked Questions

For a 5000 IU vial, add 1ml of bacteriostatic water to get 5000 IU/ml. Draw up the BAC water into an insulin syringe and inject slowly into the HCG vial along the glass wall. Gently swirl until dissolved. Store at 2–8°C.
The standard is 1ml of bacteriostatic water for a 5000 IU vial, giving 5000 IU/ml. At this concentration: 500 IU = 0.1ml = 10 units; 1000 IU = 0.2ml = 20 units.
HCG doses vary widely by protocol. Fertility applications might use 5000–10,000 IU for ovulation trigger; TRT support protocols often use 250–500 IU 2–3 times weekly; other protocols may differ. Always follow medical guidance.
With 5000 IU vial + 1ml BAC water (5000 IU/ml): 500 IU = 0.1ml = 10 units on a 100-unit insulin syringe.
HCG reconstituted with bacteriostatic water and stored at 2–8°C is typically stable for 28–30 days. Some sources suggest 60 days is acceptable. Do not freeze the reconstituted solution.
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