HCG Dosage Calculator

HCG is measured in international units rather than milligrams, but the reconstitution math 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.

Example mixes to try the converter

Examples only — not recommended amounts. These fill in a vial size and diluent volume only — never an amount to inject. Enter the dose your clinician gave you yourself.

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

Enter your target dose as a number.

Syringe type

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

Nothing calculated yet

Enter your target dose as a number.

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 doses reported in research

The figures below are doses reported in published clinical trials or, where no human trials exist, ranges reported anecdotally. They are reference data only. DoseRoutine does not recommend doses — your prescriber decides yours.

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 personalized advice.

What trips people up

In the calculator, enter 1,000 IU as 1 mg — the ratio math 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 math 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 signaling. 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.

Reviewed by the DoseRoutine editorial team. Last reviewed 2026-08-03.

Who maintains this page

The DoseRoutine Editorial Team maintains the compound library and the interaction rule set behind DoseRoutine. We summarize published trials, regulatory documents (FDA, EMA) and company announcements into plain-English updates. Every factual claim on a post is tied to a linked source below.

Posts are written and reviewed by the editorial team, not by a licensed clinician. This is educational reference content — it never recommends an amount for you to take.

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