What's the difference between mg and mcg?

1 mg (milligram) = 1,000 mcg (micrograms). Peptide vials are usually labeled in mg, while doses are typically in mcg. A 10 mg vial contains 10,000 mcg of peptide.

How do I read an insulin syringe?

Standard U-100 insulin syringes have 100 units per 1 mL. A 30-unit syringe holds 0.3 mL, a 50-unit holds 0.5 mL, and a 100-unit holds 1 mL. Each tick mark represents 1 or 2 units depending on the syringe.

How long does reconstituted peptide last?

With bacteriostatic water, reconstituted peptides typically last 28-30 days when refrigerated (2-8°C). Never freeze reconstituted peptides. Discard if cloudy or discolored. With plain sterile water, use within 24-48 hours.

What if my dose calculates to a fraction of a unit?

Round to the nearest half unit for practical measurement. If precision is critical, add more water during reconstitution to increase units per dose. For example, using 3 mL instead of 2 mL makes each unit smaller.

Can I use regular water instead of bacteriostatic water?

No. Bacteriostatic water contains 0.9% benzyl alcohol which prevents bacterial growth. Using regular water or even sterile water (without preservative) requires using the vial within 24-48 hours and increases infection risk.

Health

Peptide Calculator

Free peptide reconstitution calculator. Calculate injection volume, concentration, and doses per vial for semaglutide, tirzepatide, BPC-157, and more.

Educational Information Only

This calculator is for educational purposes. Peptides may be research compounds. Always consult a healthcare provider before use and follow prescribed protocols.

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Reconstitution Details

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How to Calculate Peptide Dosage

Reconstituting peptides requires precise calculations to ensure accurate dosing. This calculator helps you determine exactly how many units to inject based on your vial size, water volume, and desired dose. Whether you're using semaglutide, tirzepatide, BPC-157, or other peptides, get accurate results instantly.

What is Peptide Reconstitution?

Peptide reconstitution is the process of mixing lyophilized (freeze-dried) peptide powder with bacteriostatic water (BAC water) to create an injectable solution. The amount of water you add determines the concentration, which affects how many units you'll need to inject for your desired dose. Standard insulin syringes have 100 units per milliliter, making it easy to measure precise doses.

Basic Reconstitution Formula

Units = (Desired Dose in mcg × Water in mL × 100) ÷ (Peptide in mg × 1000)

Why Use a Peptide Calculator?

Precise Dosing

Avoid dosing errors that could affect results or waste expensive peptides.

Cost Tracking

Calculate cost per dose and days supply to budget your peptide protocol.

Syringe Selection

Get recommendations for the best syringe size based on your injection volume.

How to Use This Calculator