Peptide Calculator

Q: What is the difference between mg and mcg in peptide dosing?

1 mg (milligram) equals 1000 mcg (micrograms). Most peptide doses are measured in micrograms (mcg). For example, a common BPC-157 research dose is 250 mcg, which is 0.25 mg. Our calculator handles both units automatically.

Use the Prax Peptides calculator to convert vial strength, reconstitution volume, and reference dose into a precise syringe pull for your research.

What is the total volume of your syringe?

Assumes U-100 insulin syringes (100 units = 1 mL).

Select Peptide Vial Quantity

Or enter custom: mg

How much bacteriostatic water are you adding?

Or enter custom: mL

How much of the peptide do you want in each dose?

Or enter custom: mcg

Reference draw volume for the selected parameters:

— mL

(≈ — mL on a 1.0 mL syringe)

Visual syringe position

0 25 50 75 100

INTERACTIVE REFERENCE VISUALIZATION — DRAG / CLICK / ARROW KEYS

Concentration —

Dose per mL —

Approx. doses per vial —

This calculator is intended for research and educational use only. It does not provide medical advice, diagnosis, or treatment. Always follow applicable regulations and consult a qualified professional before using any peptide products.

Peptide Dosage Calculator

Peptides are short chains of amino acids that play a critical role in various biological functions, including hormone regulation, tissue repair, immune modulation, and metabolism. Because these compounds are bioactive, accurate dosing is crucial in any research environment.

A peptide dosage calculator simplifies this process by helping you convert vial strength, reconstitution volume, and reference dose into a precise syringe pull. Instead of doing the math manually, the calculator automatically determines how much solution to draw into the syringe for each injection.

Why Use a Peptide Dosage Calculator?

Precision: Ensures the correct peptide concentration is used, reducing the risk of overdosing or underdosing.
Convenience: Eliminates manual calculations and speeds up preparation.
Safety: Reduces the chance of human error when preparing peptide solutions.
Consistency: Helps keep every dose uniform from vial to vial.

How the Calculator Works

Behind the scenes, the calculator uses a simple set of formulas:

Concentration (mg/mL) = Total peptide (mg) ÷ Reconstitution volume (mL).
1 mg = 1,000 mcg.
Volume per dose (mL) = Desired dose (mcg) ÷ (Concentration (mg/mL) × 1,000).
On a U-100 insulin syringe, 1 mL = 100 units, so syringe units = mL × 100.

By adjusting vial amount, water volume, and dose, researchers can tailor each draw to their specific protocol while maintaining accurate and repeatable dosing.

Popular Research Peptides

Below are popular peptides researchers explore — each with a fully dosed reconstitution example.

How to Use the Peptide Reconstitution Calculator

Our peptide reconstitution calculator helps researchers determine the correct bacteriostatic water volume and dosing for any peptide vial. Whether you are working with BPC-157, semaglutide, tirzepatide, or TB-500, accurate reconstitution is essential for reliable research outcomes. Enter your peptide weight in milligrams and your desired dose in micrograms; the calculator returns the corresponding injection volume in milliliters.

This tool supports all common research peptides including growth hormone secretagogues like ipamorelin and CJC-1295, GLP-1 receptor agonists such as retatrutide and tirzepatide, healing peptides like BPC-157 and TB-500, and cosmetic peptides like GHK-Cu.

Peptide Dosing Guides & Research Resources

Explore our in-depth research guides covering peptide dosing protocols, reconstitution instructions, and the latest peptide science. These articles complement the calculator above by providing detailed context for each compound.

Peptide Reconstitution Guide — Step-by-step instructions for mixing peptides with bacteriostatic water
Peptide Calculator Guide — How to use the reconstitution calculator for accurate dosing
BPC-157 Complete Guide — Dosing, benefits, and research overview for Body Protection Compound
Semaglutide Complete Guide — GLP-1 agonist dosing, weight loss research, and protocols
Tirzepatide Complete Guide — Dual agonist dosing and metabolic research insights
Retatrutide Complete Guide — Triple receptor agonist research and dosing protocols
GHK-Cu Complete Guide — Copper peptide benefits for skin, hair, and tissue repair
GLP-1 Peptide Comparison — Semaglutide, tirzepatide, and retatrutide

Frequently Asked Questions

How much bacteriostatic water do I add to a peptide vial?

The amount of bacteriostatic water depends on your target concentration. Use our calculator above — enter your peptide weight (e.g., 10mg for BPC-157) and your desired dose per injection from published literature. The calculator determines how much BAC water to add and your injection volume in mL or units on an insulin syringe.

What is the standard reconstitution ratio for peptides?

There is no single standard — it varies by peptide and dose. Common protocols use 1–3mL of bacteriostatic water per vial. For example, adding 2mL to a 10mg BPC-157 vial yields 5mg/mL (5,000mcg/mL). Our calculator handles this math automatically for any peptide and dose combination.

Can I use this calculator for semaglutide and tirzepatide?

Yes. The calculator works with all injectable peptides including semaglutide, tirzepatide, and retatrutide. Enter the vial size and your weekly or daily dose to get injection volumes for your GLP-1 research.

How do I convert mL to units on an insulin syringe?

A standard U-100 insulin syringe has 100 units per 1mL. So 0.1mL equals 10 units, 0.25mL equals 25 units, and 0.5mL equals 50 units. Our peptide calculator displays results in both mL and syringe units for easy reference.

Frequently Asked Questions About Peptide Dosing

How do I reconstitute a peptide?

To reconstitute a lyophilized peptide, slowly add bacteriostatic water along the wall of the vial. Do not shake — gently swirl until the powder is fully dissolved. Common reconstitution volumes are 1 mL, 2 mL, or 3 mL depending on the reference concentration. Use our calculator above to determine the exact volume needed for your target dose.

How much bacteriostatic water should I add to my peptide vial?

The amount of bacteriostatic water depends on your peptide vial size and reference dose. For example, adding 2 mL of water to a 5 mg vial creates a concentration of 2.5 mg/mL (2500 mcg/mL). Adjust the water volume in the calculator above to see how it changes your dosing.

How do I read syringe units for peptide dosing?

On a standard U-100 insulin syringe, 100 units equals 1 mL. So 10 units is 0.1 mL, 5 units is 0.05 mL, and 1 unit is 0.01 mL. After reconstituting the peptide, use the calculator to convert your desired mcg dose into the exact number of syringe units to draw.

What is the difference between mg and mcg in peptide dosing?

1 mg (milligram) equals 1,000 mcg (micrograms). Most peptide doses are measured in micrograms. For example, a common BPC-157 research dose is 250 mcg, which is 0.25 mg. Our calculator handles both units automatically.

How many doses can I get from one peptide vial?

The number of doses depends on your vial size, reconstitution volume, and dose per injection. For example, a 5 mg vial at 250 mcg per dose gives you 20 doses total. The calculator shows approximate doses per vial based on your inputs.

Can I use this calculator for BPC-157, TB-500, or other peptides?

Yes. This peptide reconstitution calculator works for any lyophilized research peptide including BPC-157, TB-500, GHK-Cu, Semaglutide, Tirzepatide, Retatrutide, KPV, MK-677, and all other peptides. Enter the your vial size, water volume, and reference dose.

What size syringe should I use for peptide research?

U-100 insulin syringes are standard for peptide research. They come in 1.0 mL (100 units), 0.5 mL (50 units), and 0.3 mL (30 units) sizes. Smaller syringes provide more precise measurements for low-volume doses.

How should I store reconstituted peptides?

Store reconstituted peptides in the refrigerator at 2-8 degrees Celsius. Most remain stable for 4-6 weeks when properly refrigerated. Never freeze reconstituted peptides and avoid direct light exposure.