How do I use a peptide reconstitution calculator?

Select your dose, peptide vial strength, and BAC water volume. The calculator instantly shows how many units to draw on a 100-unit insulin syringe.

How much BAC water do I add to reconstitute a peptide?

A common starting point is 1-2 mL for standard peptides and 2-3 mL for GLP-1s. More water lowers the concentration and increases the units per dose.

What is the peptide calculator formula?

Units = (Dose / Vial size) x BAC water (mL) x 100. This gives the exact draw amount on a standard 100-unit insulin syringe.

Peptide Calculator — Free Reconstitution & Dosage Calculator

Peptide Dosage Quick-Reference Chart

Common reconstitution examples. Tap a peptide to view dosage details. For research purposes only.

BPC-157 Dosage

Vial	BAC Water	Dose	Draw	mL
5 mg	2 mL	250 mcg	10 units	0.10
5 mg	2 mL	500 mcg	20 units	0.20

TB-500 Dosage

Vial	BAC Water	Dose	Draw	mL
5 mg	2 mL	2.5 mg	100 units	1.00
10 mg	2 mL	2.5 mg	50 units	0.50

Semaglutide Dosage

Vial	BAC Water	Dose	Draw	mL
3 mg	1.5 mL	0.25 mg	12.5 units	0.125

Tirzepatide Dosage

Vial	BAC Water	Dose	Draw	mL
5 mg	2 mL	2.5 mg	100 units	1.00

CJC-1295 Dosage

Vial	BAC Water	Dose	Draw	mL
2 mg	2 mL	100 mcg	10 units	0.10

Ipamorelin Dosage

Vial	BAC Water	Dose	Draw	mL
2 mg	2 mL	200 mcg	20 units	0.20

PT-141 Dosage

Vial	BAC Water	Dose	Draw	mL
10 mg	2 mL	1 mg	20 units	0.20

Retatrutide Dosage

Vial	BAC Water	Dose	Draw	mL
10 mg	2 mL	4 mg	80 units	0.80

Selank Dosage

Vial	BAC Water	Dose	Draw	mL
5 mg	2 mL	250 mcg	10 units	0.10

Epitalon Dosage

Vial	BAC Water	Dose	Draw	mL
10 mg	2 mL	5 mg	100 units	1.00

Peptide Reconstitution Calculator — Complete Guide

A peptide reconstitution calculator removes the guesswork from preparing research peptides. Most peptides are shipped as lyophilised (freeze-dried) powder in sealed vials. Before they can be used, they must be reconstituted — dissolved into a liquid solution using bacteriostatic water (BAC water) or sterile water.

What is peptide reconstitution?

Reconstitution is the process of dissolving the dry peptide powder in a liquid diluent. The amount of BAC water you add directly determines the concentration of the resulting solution — and therefore how many units you draw per dose.

Peptide dosage calculator — mcg vs mg

Peptide doses are typically expressed in micrograms (mcg) or milligrams (mg). One milligram equals 1,000 micrograms. Our peptide calculator mg handles all units automatically and shows the mcg equivalent for every dose selection.

How to reconstitute peptides step by step

1. Wipe the rubber stopper with an alcohol swab. 2. Draw the desired BAC water volume into a syringe. 3. Slowly inject the water down the glass wall of the vial — never directly onto the powder. 4. Gently swirl (never shake) until fully dissolved. 5. Use the peptide reconstitution calculator online above to determine your draw per dose.

Peptide calculator for tirzepatide and semaglutide

GLP-1 agonist peptides like semaglutide and tirzepatide are commonly researched for metabolic applications. Our peptide calculator for tirzepatide and peptide calculator semaglutide — select your vial size, BAC water volume, and desired dose in mg for precise syringe draw amounts.

Peptide calculator for retatrutide

Retatrutide (GGG tri-agonist) typically comes in 5 mg or 10 mg vials. Starting doses range from 0.5 mg to 4 mg per week depending on the research protocol. Use the peptide calculator for retatrutide above for precise syringe measurements.

Peptide blend dosage calculator

For peptide blends in a single vial, use the combined mg as the "vial size." For blending from separate vials, calculate each independently and draw sequentially.

Storing reconstituted peptides

Reconstituted peptides should be refrigerated (2–8°C) and used within 28 days when reconstituted with BAC water. Lyophilised powder can be stored at room temperature away from heat and light.

Peptide Calculator — Frequently Asked Questions

With a 5 mg vial and 2 mL BAC water: 250 mcg ÷ 2,500 mcg/mL = 0.10 mL = 10 units on a 100-unit syringe. Use the calculator above for any combination.

Most research protocols use a 100-unit (1 mL) insulin syringe with a 29–31 gauge needle. The calculator above is calibrated for the 100-unit standard.

BAC water (containing 0.9% benzyl alcohol) is strongly preferred as it preserves the reconstituted vial for up to 28 days. Sterile water should only be used for single-use reconstitutions.

For GLP-1 peptides (semaglutide, tirzepatide, retatrutide), select your vial size and desired dose in mg. The peptide calculator mg for weight loss above outputs the exact syringe draw in units.

This appears when the calculated draw exceeds 100 units — the max capacity of a standard insulin syringe. Reduce your BAC water volume to increase concentration and lower the units per dose.

Yes. Completely free with no registration required. Bookmark this page for quick access whenever you need to calculate a peptide dose or reconstitution.

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