Hassle-free peptide calculator
Calculate reconstitution, syringe units, concentration, draw amount, and vial dose count in seconds. Supports multi-peptide blends and U-100, U-50, and U-40 syringes.
1. Syringe details
Pick the syringe you're drawing into.
2. Vial details
Add each peptide in the vial and the bacteriostatic water you'll mix in.
Total peptide in vial
5 mg
3. Desired dose
The amount per injection you'd like to draw.
Peptide library
View all →Prefilled calculator templates plus reconstitution math for common research peptides.
- GLP-1/GIP/GlucagonRetatrutideTriple agonist research peptide (GLP-1 / GIP / glucagon).
- GLP-1/GIPTirzepatideDual GLP-1 / GIP receptor agonist research peptide.
- GLP-1SemaglutideGLP-1 receptor agonist research peptide.
- RepairBPC-157Body Protective Compound research peptide.
- RepairTB-500Thymosin Beta-4 fragment research peptide.
- Copper peptideGHK-CuCopper tripeptide-1 research peptide.
- Growth hormone secretagogueCJC-1295Growth hormone releasing hormone analog research peptide.
- Growth hormone secretagogueIpamorelinSelective GHRP research peptide.
- MitochondrialMOTS-cMitochondrial-derived research peptide.
How this calculator works
Enter your vial size, bacteriostatic water volume, and desired dose — PeptideCalc Pro instantly returns exact draw units, mL, mg/mL, mcg per unit, and doses per vial for any peptide.
Reconstitution formula
- Concentration (mg/mL) = total peptide mg ÷ water mL
- Draw volume (mL) = desired dose mg ÷ concentration mg/mL
- Draw units = draw mL × units-per-mL of your syringe
- mcg per unit = (total mg × 1000) ÷ total units of water added
- Doses per vial = total peptide mg ÷ desired dose mg
Syringe units explained
| Syringe | Capacity | Ticks (units) | Units per mL | Per unit |
|---|---|---|---|---|
| U-100 · 1 mL | 1 mL | 100 | 100 | 0.01 mL |
| U-100 · 0.5 mL | 0.5 mL | 50 | 100 | 0.01 mL |
| U-100 · 0.3 mL | 0.3 mL | 30 | 100 | 0.01 mL |
| U-40 · 1 mL | 1 mL | 40 | 40 | 0.025 mL |
mL, mg, mcg & units conversion
- 1 mL = 100 U-100 units = 40 U-40 units
- 1 mg = 1000 mcg = 0.001 g
- On a U-100 syringe, 1 unit = 0.01 mL
- On a U-40 syringe, 1 unit = 0.025 mL
Common calculation mistakes
- Confusing U-100 and U-40 syringes — units are not interchangeable.
- Mixing mg and mcg without converting (1 mg = 1000 mcg).
- Assuming 1 unit = 1 mL — 1 unit on a U-100 syringe is 0.01 mL.
- Forgetting that adding more bacteriostatic water lowers concentration and increases draw volume.
- Rounding aggressively — always keep at least one decimal for draw units.
Frequently asked questions
How do I calculate reconstitution?+
Divide the total peptide mass in the vial by the volume of bacteriostatic water you added. That gives concentration in mg/mL. Divide your desired dose (in mg) by that concentration to get the volume to draw in mL, then multiply by the syringe's units-per-mL.
What is a U-100 insulin syringe?+
A U-100 syringe has 100 tick marks on a 1 mL barrel — so 100 units = 1 mL, and each unit = 0.01 mL. U-100 0.5 mL and 0.3 mL barrels have 50 and 30 ticks respectively, but the units-per-mL is the same.
How many mcg are in one syringe unit?+
It depends on the vial. Multiply the total peptide in mg by 1000 to get mcg, then divide by the total units of water added (mL × units-per-mL). PeptideCalc Pro shows this as mcg/unit automatically.
Is this calculator medical advice?+
No. PeptideCalc Pro is a math tool for educational and research use only. It does not recommend doses or endorse human use. Always consult a licensed medical professional.