Peptide Dosage Calculator

Enter your vial size, how much BAC water you added, and your desired dose—this calculator gives you the exact syringe units to draw, plus a visual diagram showing the fill line on your syringe.

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How to Use This Calculator

Step 1: Select a Preset or Enter Custom Values

Click BPC-157, TB-500, or Tirzepatide to auto-fill common vial sizes and starting doses. Or enter your own values manually—the calculator works with any peptide.

Step 2: Enter Your Vial Information

• Peptide in Vial — The total amount of peptide in your vial, in milligrams (mg). This is printed on the vial label.
• Bacteriostatic Water — How much BAC water you added (or plan to add) during reconstitution, in milliliters (mL).

Step 3: Enter Your Desired Dose

• Desired Dose — The amount you want per injection.
• Dose Unit — Select micrograms (mcg) or milligrams (mg). BPC-157 is typically dosed in mcg. TB-500 and tirzepatide are dosed in mg.

Step 4: Select Your Syringe

• 100-unit (1 mL) — Most common. Tick marks every 2 units.
• 50-unit (0.5 mL) — Better precision for small doses. Tick marks every 1 unit.
• 30-unit (0.3 mL) — Best precision. Tick marks every 0.5 units.

Step 5: Read Your Results

• Concentration — How much peptide per mL of solution after reconstitution.
• Volume Per Dose — The exact mL to draw per injection.
• Syringe Units — The number to draw to on your insulin syringe. This is the number you actually use.
• Doses Per Vial — How many total injections you’ll get from one vial.

The syringe diagram below the results shows exactly where to fill to on your syringe.

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Understanding the Math

You don’t need this section to use the calculator, but understanding the math helps you double-check your work.

Concentration

Concentration = Peptide Amount (mg) ÷ Water Added (mL)

Example: 5 mg peptide + 2 mL BAC water = 2.5 mg/mL (or 2,500 mcg/mL)

Volume Per Dose

Volume = Desired Dose ÷ Concentration

Example: 250 mcg dose ÷ 2,500 mcg/mL = 0.1 mL

Syringe Units

On a standard 100-unit (1 mL) insulin syringe, 1 mL = 100 units. So:

Units = Volume (mL) × 100

Example: 0.1 mL × 100 = 10 units. Draw to the 10 unit mark on your syringe.

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Quick Reference: Common Peptide Dosing

Peptide	Vial Size	BAC Water	Dose	Syringe Units
BPC-157	5 mg	2 mL	250 mcg	10 units
BPC-157	5 mg	2 mL	500 mcg	20 units
TB-500	5 mg	2 mL	2.5 mg	100 units
TB-500	5 mg	2 mL	750 mcg	30 units
Tirzepatide	10 mg	2 mL	2.5 mg	50 units
Tirzepatide	30 mg	3 mL	5 mg	50 units

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Tips for Accurate Dosing

• Read at eye level. Hold the syringe horizontally at eye level to read the meniscus (the bottom curve of the liquid line). Reading from above or below gives inaccurate measurements.
• Use the right syringe. For doses under 20 units, a 50-unit or 30-unit syringe gives better precision than a 100-unit syringe.
• Be consistent with BAC water. Always add the same amount of BAC water each time you reconstitute the same peptide. This keeps your concentration—and your dose math—consistent.
• Account for dead space. Insulin syringes have minimal dead space, but low dead volume (LDV) needles waste even less. For expensive peptides, this matters.
• Store reconstituted vials properly. Refrigerate at 2–8°C. Use within 4–6 weeks. Never freeze a reconstituted vial.

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Related Guides

• Reconstitution Guide — Full step-by-step reconstitution technique, storage guidelines, and peptide-specific handling notes.
• Equipment Guide — Everything you need to get started, with budget breakdowns.
• BPC-157 Complete Guide — Dosing protocols, research overview, and practical usage.
• TB-500 Complete Guide — Loading and maintenance protocols, stacking with BPC-157.

This calculator is for research and educational purposes only. It is not medical advice. Always consult a qualified healthcare professional before using any peptide.