DoseRoutine

HCG Dosage Calculator

HCG is measured in international units rather than milligrams, but the reconstitution maths is identical — treat 1,000 IU as 1 'mg' in the calculator below and the unit conversions hold exactly.

This is a unit converter. It converts an amount you already have into volume and syringe units. It does not tell you what to take, and it is educational only — not medical advice. Confirm every amount with your clinician and your product label.

Common setups

Vial size (1 mg = 1,000 IU)

Total compound in the vial.

BAC water added (mL)

Volume of bacteriostatic water you reconstitute with.

Target dose

Per-injection dose you want to draw.

Syringe type

U-100 = 100 units per mL (standard). U-40 = 40 units per mL.

Draw

25.0 units

on a U-100 insulin syringe (0.250 mL)

Concentration

1.00 mg/mL

Per dose

250 mcg

Doses / vial

~20

HCG concentration reference (mg/mL)

What each vial size becomes at common bacteriostatic water volumes.

Vial	+ 1 mL	+ 2 mL	+ 3 mL	+ 5 mL
5 mg	5.00 mg/mL	2.50 mg/mL	1.67 mg/mL	1.00 mg/mL
10 mg	10.00 mg/mL	5.00 mg/mL	3.33 mg/mL	2.00 mg/mL
11 mg	11.00 mg/mL	5.50 mg/mL	3.67 mg/mL	2.20 mg/mL

HCG dosing at a glance

Phase	Dose	Frequency	Notes
TRT adjunct	250–500 IU	2–3× weekly	Used to preserve testicular function and fertility.
Fertility protocols	1,000–2,500 IU	2–3× weekly	Prescriber-directed; monitored with bloodwork.
Post-cycle	500–1,000 IU	Short course	Restart protocols vary widely.
Monitoring	—	Every 8–12 weeks	Oestradiol can rise; total testosterone and E2 are tracked.

Reference ranges reported in the literature and in common practice — not a prescription, and not personalised advice.

What trips people up

In the calculator, enter 1,000 IU as 1 mg — the ratio maths is identical, so a '5 mg' vial mixed in 5 mL means 1,000 IU/mL and 250 IU = 25 units.
HCG must be refrigerated after reconstitution and is generally treated as good for around 30 days.
HCG raises oestradiol in some men on TRT — bloodwork matters more here than with most peptides.
HCG is prescription-only. Purity and dose accuracy from unregulated sources are a real risk.

How the maths works

Concentration (mg/mL) = vial mg ÷ bacteriostatic water mL.
Volume per dose (mL) = dose mg ÷ concentration.
Syringe units = volume × 100 on a U-100 syringe, or × 40 on a U-40 syringe.
Doses per vial = vial mg ÷ dose mg. Water volume never changes this number.

HCG calculator FAQ

How many units is 250 IU of HCG?

At 1,000 IU/mL (a 5,000 IU vial mixed with 5 mL BAC water) it is 0.25 mL = 25 units on a U-100 syringe. At 2,500 IU/mL (5,000 IU + 2 mL) the same dose is 10 units.

How much BAC water for a 5,000 IU HCG vial?

5 mL is the cleanest option because it gives 1,000 IU per mL, making the arithmetic trivial: 250 IU = 25 units, 500 IU = 50 units, 1,000 IU = 100 units.

Why is HCG used alongside TRT?

Exogenous testosterone suppresses LH, which shuts down testicular signalling. HCG mimics LH, so it is used to maintain testicular volume and fertility during therapy.

How long does mixed HCG last?

Refrigerated at 2–8 °C, reconstituted HCG is typically treated as usable for around 30 days. Never freeze it and never leave it at room temperature.

HCG reference page Check interactions TRT & supplement interactions

Educational tool only — not medical advice. Verify every dose with your prescriber and follow sterile technique. See our medical disclaimer.

More free DoseRoutine calculators and dosing references.