Peptide Calculator
Precision reconstitution, dosage, blending, and unit conversion tools for peptide researchers. Free, accurate, and instant.
Popular Peptide Presets
Select a peptide to auto-fill the reconstitution calculator.
Peptide Reconstitution Calculator
Determine exactly how much bacteriostatic water to add to your lyophilized peptide powder.
Reconstitution Calculator
Enter your peptide amount and target concentration
Formula:
Water (mL) = Peptide Amount (mg) ÷ Concentration (mg/mL)
Enter values above to see live formula.
📐 Example
5mg BPC-157 ÷ 1 mg/mL = 5 mL bacteriostatic water
This gives a 1,000 mcg/mL (1 mg/mL) solution.
Peptide Dosage Calculator
Calculate exactly how many syringe units or mL to draw for your desired dose.
Dosage Calculator
Determine draw volume and syringe units for any dose
Formula:
Conc. = Vial mg ÷ Recon mL
Draw mL = Dose mcg ÷ (Conc. × 1000)
Units = Draw mL × Syringe Factor
Peptide Blend Calculator
Calculate individual and combined concentrations when mixing multiple peptides into one vial.
Blend Calculator
Mix up to three peptides and calculate all concentrations
💡 Example Blend
BPC-157 5mg + TB-500 5mg + 3mL bac water
→ BPC-157: 1.67 mg/mL | TB-500: 1.67 mg/mL
→ Total: 3.33 mg/mL combined
Peptide Unit Converter
Instantly convert between mg, mcg, mL, and IU.
Unit Converter
mg ↔ mcg · mL ↔ IU
mg ↔ mcg
mL ↔ IU (U-100)
| From | To | Multiply By |
|---|---|---|
| mg | mcg | × 1,000 |
| mcg | mg | ÷ 1,000 |
| mL | IU (U-100) | × 100 |
| IU (U-100) | mL | ÷ 100 |
| mL | IU (U-40) | × 40 |
| IU (U-40) | mL | ÷ 40 |
Everything You Need to Know About Peptide Calculations
1. What Is a Peptide Calculator?
A peptide calculator is a digital tool designed to eliminate manual arithmetic errors in research settings. Peptides are typically sold as lyophilized (freeze-dried) powders measured in milligrams (mg). Before use, they must be dissolved in a solvent — usually bacteriostatic water (BAC water) — to create a liquid solution at a known concentration.
Without accurate calculations, it’s easy to reconstitute at the wrong concentration or draw an incorrect volume. A peptide calculator handles all the math — reconstitution volume, dosage draw volume, syringe unit conversion, and blending ratios — instantly and without error.
2. How Peptide Reconstitution Works
Reconstitution involves dissolving a dry peptide powder into bacteriostatic water to create a stable, injectable solution. The key variable is concentration — how many mg of peptide per mL of water.
- Higher concentration (e.g. 2 mg/mL) means smaller draw volumes per dose — useful for higher doses or to reduce injection volume.
- Lower concentration (e.g. 0.5 mg/mL) means larger draw volumes — easier to measure precisely on smaller syringe scales.
Inject bacteriostatic water slowly down the inner wall of the vial. Never inject directly onto the powder cake. Gently swirl — never shake — until fully dissolved. Store reconstituted peptides refrigerated at 2–8°C and use within 28–56 days depending on the peptide.
3. Understanding mg, mcg, mL, and IU
| Unit | Stands For | Context |
|---|---|---|
| mg | Milligram | Vial content; peptide weight (1/1000 of a gram) |
| mcg / µg | Microgram | Dose precision; 1 mg = 1,000 mcg |
| mL | Millilitre | Volume of solution to draw or add |
| IU | Insulin Unit | Syringe marking — U-100 = 100 IU/mL; U-40 = 40 IU/mL |
Confusing mg with mcg — a 1,000-fold difference — is one of the most common and serious errors in peptide research. Always double-check which unit a dose is expressed in before drawing.
4. How to Calculate Peptide Dosages
Once you know your solution’s concentration, dosage calculation is straightforward:
- Convert your desired dose from mcg to mg: divide by 1,000.
- Divide the mg dose by the mg/mL concentration to get your draw volume in mL.
- Multiply by your syringe factor (100 for U-100, 40 for U-40) to get unit marks.
Example: 250 mcg dose from a 5mg/2mL (2.5 mg/mL) solution on a U-100 syringe:
0.25 mg ÷ 2.5 mg/mL = 0.10 mL × 100 = 10 units
5. Common Peptide Reconstitution Examples
| Peptide | Vial Size | BAC Water | Concentration | 250 mcg Dose |
|---|---|---|---|---|
| BPC-157 | 5 mg | 2 mL | 2.5 mg/mL | 0.10 mL / 10 IU |
| TB-500 | 5 mg | 2 mL | 2.5 mg/mL | 0.10 mL / 10 IU |
| CJC-1295 | 2 mg | 2 mL | 1.0 mg/mL | 0.25 mL / 25 IU |
| Ipamorelin | 5 mg | 2 mL | 2.5 mg/mL | 0.10 mL / 10 IU |
| Semaglutide | 5 mg | 2 mL | 2.5 mg/mL | 0.10 mL / 10 IU |
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Further Reading
⚠️ Research Disclaimer: This calculator is provided for educational and research purposes only. Users are responsible for independently verifying all calculations. Cocer Peptides makes no guarantees regarding calculation accuracy and assumes no liability for any use of the information provided. Peptides sold by Cocer Peptides are intended for laboratory and research use only, and are not approved by the FDA for human consumption. Always consult a qualified healthcare professional.
Frequently Asked Questions
Answers to the most common peptide calculation questions.