The peptide
calculator researchers
actually use.
Reconstitution and dosage math, done correctly. Calculate exactly how much bacteriostatic water to add, how many syringe units equal your target dose, and how long a vial will last — all without the spreadsheet.
How to use this peptide calculator
The two tabs above handle the two calculations researchers run most often: figuring out how much bacteriostatic water to add to a lyophilized vial, and figuring out how many syringe units a target dose corresponds to once the peptide is reconstituted.
Both tabs default to common values (10 mg vial, 2 mL BAC water, 250 mcg dose, 30-unit insulin syringe) so you can see how the math works before plugging in your own numbers.
Reconstitution: what the inputs mean
Vial size is the total peptide content listed on the label, in milligrams. A standard BPC-157 vial is 5 or 10 mg; Ipamorelin is typically 5 or 10 mg; CJC-1295 No DAC is usually 5 mg. Check the certificate of analysis for actual net peptide content, which can vary slightly from the label.
BAC water volume is how much bacteriostatic water you add to the vial. More water means a less concentrated solution and more syringe units per dose; less water means the opposite. Most researchers add between 1 and 3 mL.
Target dose is what you intend to deliver per administration. The calculator converts this to a draw volume and a unit count on whichever insulin syringe you’ve selected.
Dosage: what the inputs mean
Solution concentration is the mg/mL of your reconstituted vial — directly from the reconstitution math, or printed on a pre-mixed solution. This is the working number.
Target dose can be entered in micrograms, milligrams, or international units. IU conversion is peptide-specific and requires the conversion factor from the COA.
Reference: standard reconstitution ratios
Common Peptides
| Peptide | Typical Vial | Common BAC | Result |
|---|---|---|---|
| BPC-157 | 5 mg | 2 mL | 2.5 mg/mL |
| BPC-157 | 10 mg | 2 mL | 5.0 mg/mL |
| TB-500 | 10 mg | 2 mL | 5.0 mg/mL |
| Ipamorelin | 10 mg | 2 mL | 5.0 mg/mL |
| CJC-1295 No DAC | 5 mg | 2 mL | 2.5 mg/mL |
| GHK-Cu | 50 mg | 5 mL | 10.0 mg/mL |
| Tesamorelin | 10 mg | 2 mL | 5.0 mg/mL |
| MOTS-c | 10 mg | 2 mL | 5.0 mg/mL |
These are reference ratios commonly used in research protocols, not prescriptions. The “right” reconstitution volume depends on your target dose and how granular your syringe measurements need to be.
The math, in plain language
Reconstitution
Concentration equals total peptide mass divided by solvent volume. A 10 mg vial reconstituted with 2 mL of BAC water yields a 5 mg/mL solution.
To deliver a 250 mcg dose from a 5 mg/mL solution: 250 mcg ÷ 5,000 mcg/mL = 0.05 mL. On a U-100 insulin syringe, 0.05 mL equals 5 units.
Dosage in syringe units
U-100 insulin syringes are calibrated so that 100 units equal 1 mL. Each unit is 0.01 mL. The calculator handles the conversion automatically based on your selected syringe size.
Frequently asked questions
What is bacteriostatic water and why do I need it?
Bacteriostatic water (BAC water) is sterile water containing 0.9% benzyl alcohol, which inhibits bacterial growth in solution. It’s the standard solvent for reconstituting research peptides and lets the reconstituted solution remain stable for extended periods at refrigeration temperatures. Sterile water without benzyl alcohol works for single-use applications but doesn’t preserve the solution.
How long does a reconstituted peptide last?
Most peptides remain stable in BAC water for several weeks when stored at refrigerator temperatures (2–8°C). Specific shelf life varies by peptide and is usually documented in the manufacturer’s stability data. Lyophilized (unreconstituted) peptides remain stable for years when stored frozen.
What’s the difference between mg, mcg, and IU?
Milligrams (mg) and micrograms (mcg) are units of mass — 1 mg equals 1,000 mcg. International units (IU) are a measure of biological activity rather than mass, and the IU-to-mcg conversion is peptide-specific. For example, growth hormone has a different IU/mcg ratio than HCG. Always check the certificate of analysis for the specific peptide.
Can I use the same calculator for any peptide?
The reconstitution and volume math works identically for any peptide because it’s based on mass and volume. The only peptide-specific input is the IU conversion factor, which is required when working with IU-dosed compounds. For mass-based dosing (mg or mcg), the calculation is universal.
Why are my unit values not whole numbers?
Insulin syringes are calibrated in single-unit increments, but precise dose calculations often produce fractional unit values. In practice, researchers either round to the nearest whole or half unit, or adjust the reconstitution volume so the target dose lands on a clean unit value. Adjusting BAC water volume up or down by a small amount can shift the math considerably.
Is this calculator a substitute for medical advice?
No. This tool performs arithmetic conversions for research and educational purposes only. Peptides referenced are research compounds and not FDA-approved for human use unless otherwise noted. Consult a qualified medical professional before making any health-related decisions.
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