How do I use a peptide reconstitution calculator?

Enter the vial size in mg, the amount of BAC water in mL you want to add, and the calculator will show you the concentration per mL and per unit on an insulin syringe.

How do I calculate my peptide dosage?

Enter the desired dose in mcg, the peptide concentration (from reconstitution), and the calculator will tell you exactly how many units to draw on a 100-unit insulin syringe.

How much BAC water should I use to reconstitute peptides?

Common practice is 1–2 mL of bacteriostatic water per vial. Use the reconstitution calculator above to get the exact concentration and draw volumes for your dose.

Peptide Calculator – Free Peptide Dosage & Reconstitution Calculator 2026

Peptide Reconstitution Calculator

Calculate concentration after adding BAC water

Quick:

Vial Size (mg)

Please enter a valid vial size.

BAC Water to Add (mL)

Common: 1 mL, 2 mL (for 100-unit insulin syringe math)

Please enter a valid BAC water amount.

—

mcg per 0.01 mL (1 unit on insulin syringe)

Concentration—

Per 10 units (0.1 mL)—

Per 20 units (0.2 mL)—

Per 50 units (0.5 mL)—

Per 100 units (full syringe)—

Peptide Dosage Calculator

Find exact units to draw on your syringe

Select Peptide (optional — fills common data)

Desired Dose (mcg)

mcg

Please enter a desired dose.

Peptide Concentration (from reconstitution)

mcg/mL

Please enter concentration.

Syringe Type

—

units on a 100-unit insulin syringe

Volume to inject—

Actual dose delivered—

Doses per vial—

Syringe fill level (out of 100 units)

010203040 5060708090100

Reconstitution Conversion Table

See mcg per unit for any vial + BAC water combination

Vial Size (mg)

Highlight my dose (mcg)

mcg

BAC Water Added	Concentration	mcg / 1 unit	mcg / 10 units	Units for your dose	mL for your dose

Research Use Only. This peptide calculator is intended strictly for educational and research purposes. Peptides are not approved for human use by the FDA. Always consult a licensed healthcare professional before administering any substance. This tool does not constitute medical advice.

How to Use These Calculators

1. Reconstitute Your Peptide

Enter your vial size in mg and how much bacteriostatic (BAC) water you plan to add. The calculator instantly shows your concentration and how many mcg are in each unit of your syringe.

2. Calculate Your Dose

Enter your target dose in mcg and your peptide concentration. The dosage calculator tells you exactly how many units to draw on a 100-unit, 50-unit, or 30-unit insulin syringe.

3. Use the Conversion Table

The conversion table lets you compare different BAC water volumes for a given vial size—so you can find the most convenient concentration and syringe draw amount for your protocol.

Frequently Asked Questions

A peptide reconstitution calculator helps you determine the concentration of your peptide solution after adding bacteriostatic (BAC) water to a lyophilized (freeze-dried) vial. Enter the vial size in mg and the volume of BAC water in mL, and it will tell you the mcg per mL and mcg per syringe unit.

To calculate peptide dosage: (1) reconstitute your vial and note the concentration in mcg/mL, (2) enter your desired dose in mcg into the dosage calculator, (3) the tool divides your dose by concentration and converts to syringe units. Formula: Units = (Dose mcg ÷ Concentration mcg/mL) × 100.

Most researchers use 1–2 mL of bacteriostatic water per vial. Using 2 mL for a 5 mg vial gives a convenient concentration of 2,500 mcg/mL (25 mcg per unit). The right amount depends on your dose size — use the conversion table to find the most practical volume for your protocol.

Most peptide researchers use a 100-unit (1 mL) insulin syringe, typically with a 27–31 gauge needle. These are widely available and allow precise dosing. Our calculator supports 100-unit, 50-unit, and 30-unit syringe types.

Concentration (mcg/mL) = Vial Size (mg) × 1000 ÷ BAC Water (mL). Then, mcg per unit = Concentration ÷ 100. For example: 5 mg vial + 2 mL BAC water = 2,500 mcg/mL = 25 mcg per unit on a 100-unit syringe.

Formula: Units to draw = (Desired Dose in mcg ÷ Concentration in mcg/mL) × 100. Example: 250 mcg dose with 2,500 mcg/mL concentration = (250 ÷ 2500) × 100 = 10 units on the syringe.

Yes. This calculator works for any lyophilized peptide vial including BPC-157, TB-500, Ipamorelin, CJC-1295, Semaglutide, Tirzepatide, PT-141, GHRP-2, GHRP-6, Sermorelin, and many more. Just enter your vial size and BAC water volume.

About the Peptide Calculator

Our free peptide calculator simplifies the math behind peptide research. Whether you need a peptide reconstitution calculator to figure out how much BAC water to add, or a peptide dosage calculator to determine how many units to draw on your syringe, this tool handles everything instantly and accurately.

The peptide dosing calculator eliminates common errors by automating the formula: Units = (Dose ÷ Concentration) × 100. This is especially useful for peptides like BPC-157 (typical dose 250–500 mcg), TB-500 (2–10 mg per week), Ipamorelin (100–300 mcg), and Semaglutide (0.25–2.4 mg per week).

The conversion table is particularly helpful when deciding how much BAC water to use — a lower BAC water volume gives a higher concentration, meaning you draw fewer units per dose. Most researchers find 1–2 mL the most practical range for a standard insulin syringe.