How do I mix HCG with bacteriostatic water?

Slowly inject the BAC water down the side of the vial, not directly onto the powder. Gently swirl (don't shake) until dissolved. Common volumes are 1–2 mL for a 5,000 IU vial.

How many units of HCG is 250 IU?

It depends on how much BAC water you added. With a 5,000 IU vial mixed with 2 mL of BAC water, 250 IU = 5 units on an insulin syringe. This calculator does the math for any combination.

What's the standard HCG dose for TRT?

Most TRT protocols use 250–500 IU two to three times per week (500–1500 IU total weekly). The purpose is typically to maintain testicular function and fertility while on testosterone. Your doctor will adjust based on labs.

How long does reconstituted HCG last?

About 30 days when refrigerated and mixed with bacteriostatic water. If mixed with sterile water (no preservative), use within 24 hours. Always refrigerate after mixing.

Can I use a 5,000 IU or 10,000 IU vial?

Yes. Enter the IU amount from your vial label into this calculator. Common sizes are 2,000, 5,000, and 10,000 IU. Larger vials just mean more doses per vial.

What syringe should I use for HCG?

A standard U-100 insulin syringe (0.5 mL or 1 mL). These are marked in units where 100 units = 1 mL. HCG is injected subcutaneously, so a 29–31 gauge, ½-inch needle works well.

How much BAC water should I add to HCG?

Most people use 1–2 mL. More water makes it easier to measure small doses accurately. Less water means fewer injections before you need a new vial. There's no clinical difference in effectiveness.

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HCG Calculator

Convert any HCG vial to exact insulin syringe units. Enter your vial size, BAC water, and target dose.

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HCG Vial Size (IU)

Bacteriostatic Water (mL)

Target Dose (IU)

Draw syringe to

6 units

(0.06 mL)

Your dose (250 IU)

100 units = 1mL

2,500 IU/mL

Concentration

0.1 mL

Per Dose

Doses / Vial

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For educational and research purposes only. This calculator provides estimates based on standard formulas.

Always verify calculations with your healthcare provider before use. We assume no liability for dosing errors, adverse events, or outcomes resulting from use of this tool.

How to Use This HCG Calculator

Enter your vial size

The total IU printed on your HCG vial (e.g., 5,000 IU)

Enter BAC water volume

How much bacteriostatic water you added (typically 1–2 mL)

Enter your target dose

Your prescribed dose per injection (e.g., 250 IU)

Read your syringe units

See exactly how many units to draw on your insulin syringe

Worked Example: 5,000 IU Vial

The most common HCG setup for TRT protocols

Vial

5,000 IU

BAC Water

2 mL

Target Dose

250 IU

The Math

5,000 IU ÷ 2 mL=2,500 IU/mL concentration

250 IU ÷ 2,500 IU/mL=0.1 mL needed

0.1 mL × 100=10 units

For 250 IU, draw:

10 units

on your insulin syringe (20 doses per vial)

HCG Questions & Answers

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Data Sources

This tool uses dosing information from official prescribing information:

•IU-to-Volume Conversion — Standard IU concentration formulas for reconstituted HCG
•Insulin Syringe Standards — U-100 syringe conversion: 100 units = 1 mL

Track your HCG protocol, not just the math

Regimen has a built-in dose calculator plus reminders, logging, and progress tracking.

Built-in dose calculators
Smart injection reminders
Track progress over time
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Regimen app screenshot showing protocol tracking