Peptide Dosage
Calculate accurate peptide reconstitution dosage: convert peptide mass to injection volume, insulin syringe units, and total vial needs using our free peptide dosage calculator.
About This Calculator
The Peptide Dosage Calculator helps researchers and healthcare professionals accurately convert peptide vial mass into the correct liquid injection volume after reconstitution with bacteriostatic water. Getting the math right is critical — even a small calculation error can lead to underdosing or overdosing. Our tool handles all the conversions automatically, including the relationship between milligrams (mg), micrograms (mcg), milliliters (mL), and U-100 insulin syringe units.
Peptides are short chains of amino acids (40 or fewer) that act as signaling molecules in the body. Peptide therapy uses these molecules to regulate biological processes, requiring precise dosing based on the vial capacity, the volume of diluent used, and the target dose. The core formula is Concentration (mg/mL) = Vial Capacity (mg) ÷ Diluent Volume (mL). Once you have the concentration, the dose volume is calculated as Dose Volume (mL) = Target Dose (mg) ÷ Concentration (mg/mL). For U-100 insulin syringes, each mL equals 100 units.
Our calculator supports both fixed-dose and weight-based dosing. In weight-based mode, the daily dose is computed from body weight (kg) and the prescribed dose per kg (mcg/kg). You can also enter a cycle length (in days) to calculate the total amount of lyophilized peptide needed for the entire treatment duration. Results update instantly and the URL saves your inputs for easy sharing or bookmarking.
Important Safety Note
This calculator is designed for educational and research purposes. Always follow FDA-approved instructions for specific peptide products. Reconstitution should only be performed using the diluent and volume specified in the product instructions, using sterile techniques. Peptide therapy requires a prescription from a licensed medical professional and products produced in cGMP-certified facilities.
Frequently Asked Questions
How do I calculate peptide dosage from vial capacity and bacteriostatic water?
Divide the vial capacity (mg) by the volume of bacteriostatic water (mL) to get the concentration (mg/mL). Then divide your target dose (mg) by the concentration to get the dose volume (mL). On a U-100 insulin syringe, multiply the dose volume in mL by 100 to get the syringe units.
What is the formula for peptide reconstitution concentration?
The formula is: Concentration (mg/mL) = Vial Capacity (mg) ÷ Diluent Volume (mL). For example, reconstituting a 5 mg vial with 1 mL of bacteriostatic water gives a concentration of 5 mg/mL. Your dose volume is then: Dose Volume (mL) = Target Dose (mg) ÷ Concentration (mg/mL).
How many units on an insulin syringe equals my peptide dose?
Standard U-100 insulin syringes have 100 units per 1 mL. Multiply your dose volume in mL by 100 to get units. For example, if your calculated dose volume is 0.35 mL, you would draw 35 units on a U-100 insulin syringe.
How do I convert mcg to mg for peptide dosing?
To convert micrograms (mcg) to milligrams (mg), divide by 1000. For example, 250 mcg = 0.25 mg. Our calculator supports both units and automatically converts when calculating the dose volume.
What is weight-based peptide dosing and how does it work?
Weight-based dosing calculates the daily dose based on body weight. Multiply your weight in kg by the prescribed dose per kg (in mcg/kg) to get the daily dose in mcg, then divide by 1000 to convert to mg. Use the weight-based dosing toggle in our calculator for this calculation.
How much total peptide do I need for a treatment cycle?
Multiply your daily dose in mg by the number of days in your cycle. For example, a 30-day cycle with a 0.5 mg daily dose requires 15 mg of total peptide. Enter your cycle length in the calculator to automatically compute the total peptide needed.
What is the difference between a peptide and a protein?
According to the FDA, a peptide is an amino acid chain of 40 or fewer amino acids, while a protein is longer than 40 amino acids. Peptides act as signaling molecules that can regulate biological processes by binding to cell surface receptors.
What is peptide therapy and how is it regulated?
Peptide therapy uses specially designed amino acid sequences to help regulate biological processes by sending, blocking, or adjusting specific signals. It requires FDA-approved treatments prescribed by licensed medical professionals, with peptides produced in cGMP-certified facilities following sterile reconstitution protocols.