Peptide Calculator
Calculate exact syringe units for your desired peptide dose. Visualize and verify your dosing accuracy with our interactive calculator.
To have a dose of 0.25 mg pull the syringe to
10 units
Medical Disclaimer
This calculator is for informational purposes only and does not constitute medical advice. Always consult with a qualified healthcare provider before starting, stopping, or modifying any peptide therapy. Dosing requirements vary by individual, and incorrect dosing can be dangerous. The accuracy of calculations depends on correct input values.
📐 How is this calculated?
Step 1: Concentration
5 mg ÷ 2 ml = 2.50 mg/ml
Step 2: mg per Unit
2.50 mg/ml ÷ 100 units/ml = 0.0250 mg/unit
Step 3: Units Needed
0.25 mg ÷ 0.0250 mg/unit = 10 units
Understanding Peptide Dosing
Accurate dosing is critical when working with reconstituted peptides. This calculator helps you determine the exact number of units to draw on your insulin syringe for your desired dose, eliminating guesswork and reducing the risk of dosing errors.
How to Use This Calculator
- Select Peptide Strength: The amount of peptide powder in your vial (usually 5mg, 10mg, etc.)
- Select Reconstitution Volume: How much bacteriostatic water or saline you added
- Select Desired Dose: Your target dose per injection in mg
- Select Syringe Size: Choose your insulin syringe capacity (30, 50, or 100 units)
The calculator instantly shows your concentration (mg/ml), mg per unit, and the exact units to draw. Use the visual syringe guide to verify your dose level.
Common Syringe Sizes
100-unit (1ml)
Most common size. Each unit = 0.01ml. Best for larger doses and higher concentrations.
50-unit (0.5ml)
Each unit = 0.01ml. Ideal for medium doses. Offers finer control than 100-unit.
30-unit (0.3ml)
Each unit = 0.01ml. Best for very small doses and low concentrations. Finest precision.
Common Dosage Examples
| Peptide | Common Dose | Example Recon | Units (100-unit) |
|---|---|---|---|
| Tirzepatide | 2.5 mg | 10mg / 2ml | 50 units |
| Semaglutide | 0.5 mg | 5mg / 2ml | 20 units |
| BPC-157 | 250 mcg | 5mg / 2ml | 10 units |
| Ipamorelin | 200 mcg | 5mg / 2ml | 8 units |
Note: These are examples only. Always follow your healthcare provider's dosing instructions.
Safety Tips
- Double-check calculations: Always verify your math before injecting
- Use consistent syringe size: Stick with the same syringe type to avoid confusion
- Account for dead space: Insulin syringes have ~0.02ml dead space
- Start low, go slow: Begin with lower doses when trying a new peptide
- Label your vials: Mark concentration and reconstitution date
- Verify clarity: Discard if solution appears cloudy or discolored
Understanding Concentrations
Concentration is how much peptide is dissolved per ml of liquid. Higher concentrations mean less volume per dose, but require more precision. Lower concentrations are easier to measure accurately but require larger injection volumes.
Example: If you have 10mg of peptide and add 2ml of BAC water:
- Concentration = 10mg ÷ 2ml = 5mg/ml
- On a 100-unit syringe: Each unit = 5 ÷ 100 = 0.05mg (50 mcg)
- For a 0.25mg dose (250 mcg): 0.25 ÷ 0.05 = 5 units
Troubleshooting Common Issues
Dose exceeds syringe capacity?
- • Use a larger syringe (e.g., switch from 30-unit to 100-unit)
- • Reduce reconstitution volume for higher concentration
- • Split dose into multiple injections
Dose is less than 2 units?
- • Increase reconstitution volume for lower concentration
- • Use a smaller syringe for better precision
- • Very small doses (<1 unit) are difficult to measure accurately