I built this for myself first — then opened it up because peptide research deserves better tools. Free. All five modes work. Every step of the math shown so you actually understand the answer instead of just trusting it.
These are common research configurations — not personal recommendations.
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This calculator is provided strictly for educational and research purposes only. Nothing here is medical advice. Reference ranges reflect amounts published in research literature, not personal recommendations. Always work with a qualified healthcare provider before making health decisions.
Bacteriostatic water is sterile water with 0.9% benzyl alcohol. The preservative prevents bacterial growth, so it's the standard diluent for multi-draw research vials.
An insulin syringe is marked in units. U-100 means 100 units per 1 mL — so 25 units = 0.25 mL. That's why we convert your dose into units to draw.
Reconstitute slowly down the side of the vial, swirl — don't shake — and refrigerate at 2–8°C. Most peptides are ~28 days stable once mixed; always verify per compound.
The universal formula, conversion tables, worked examples, and a 20-compound dosing reference — all in one clean PDF.
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Research peptides ship as a lyophilized (freeze-dried) powder. Before they can be studied in liquid form they must be reconstituted — dissolved in bacteriostatic (BAC) water. A reconstitution calculator does the conversion for you: it takes the amount of peptide in the vial and the volume of BAC water you add, works out the concentration, and tells you exactly how many units to draw on an insulin syringe for your target dose.
The math itself is simple but easy to get wrong under pressure. The universal formula is: concentration = vial (mg) ÷ BAC water (mL); mcg per unit = (concentration × 1000) ÷ syringe units per mL; units to draw = desired dose (mcg) ÷ mcg per unit. This tool shows every one of those steps so you learn the logic, not just the answer.
BAC water is sterile water containing 0.9% benzyl alcohol, a mild preservative that keeps a multi-draw vial from growing bacteria. It's the standard diluent for research peptides that will be accessed more than once.
Anyone doing peptide research who wants to get the concentration and draw volume right the first time — from complete beginners reconstituting their first vial to experienced researchers running blends and split-dose schedules. All five modes are free, with no signup.
1) Pick a preset or choose a mode. 2) Enter the vial amount and the BAC water you're adding. 3) Enter your target dose and pick your syringe type. 4) Read the big "draw to" number and check the visual syringe — the math box shows exactly how it was calculated.
| Compound | Vial | BAC water | Concentration |
|---|---|---|---|
| BPC-157 | 5 mg | 2 mL | 2.5 mg/mL |
| TB-500 | 5 mg | 2 mL | 2.5 mg/mL |
| Semaglutide | 2 mg | 2 mL | 1 mg/mL |
| Tirzepatide | 5 mg | 2 mL | 2.5 mg/mL |
| Retatrutide | 10 mg | 2 mL | 5 mg/mL |
| CJC-1295 (no DAC) | 5 mg | 2 mL | 2.5 mg/mL |
| Ipamorelin | 5 mg | 2 mL | 2.5 mg/mL |
| MOTS-c | 10 mg | 2 mL | 5 mg/mL |
| GHK-Cu | 50 mg | 5 mL | 10 mg/mL |
Because the free calculators out there are either broken, locked behind a signup, or hide the math. I wanted a tool that's genuinely free, runs all five modes, and shows every step so you actually understand what you're doing. No shortcuts, no gimmicks — just a better tool for the space. — Coach Cam