Peptide Dosage Calculator: Reconstitution, Syringe Units & Cost Per Dose
How much bacteriostatic water do you actually need, and where on the syringe should the plunger stop? Those two questions cause more wasted vials than anything else in peptide research. This peptide dosage calculator takes your vial strength and dilution volume and turns them into an exact, syringe-ready number — no spreadsheet, no guessing. The biggest benefit of a proper dosage calculator is simple: you stop drawing up the wrong volume by accident, and you know exactly how many doses a single vial will actually give you.
Common Peptide Vial Sizes This Calculator Handles
Most researchers land on one of a handful of standard vial strengths. Tap a preset above to auto-fill the vial field, or use the table below as a quick reference before you calculate your own numbers.
| Peptide | Common vial size | Typical BAC water added |
|---|---|---|
| BPC-157 | 5 mg | 2 mL |
| TB-500 | 5 mg | 2 mL |
| Ipamorelin | 5 mg | 2 mL |
| CJC-1295 | 2 mg | 2 mL |
| Semaglutide | 5 mg / 10 mg | 2 mL |
| Tirzepatide | 10 mg / 15 mg | 2 mL |
| Retatrutide | 10 mg | 2 mL |
| PT-141 | 10 mg | 2 mL |
| Tesamorelin | 5 mg | 2 mL |
How This Peptide Dosage Calculator Works
The math behind every reconstitution calculator is the same three steps — this tool just does them instantly and draws the syringe for you.
- Find the concentration. Vial strength in micrograms divided by the water volume you added gives you mcg per mL.
- Convert your target dose to volume. Your desired dose in mcg divided by the concentration gives you the mL you need to draw.
- Convert mL to syringe units. Every U-100 syringe reads 100 units per mL, regardless of barrel size, so mL × 100 gives you the exact unit mark to pull to.
That is the entire calculation — the hard part is never the math, it's reading the wrong number off a tiny syringe barrel, which is exactly what the live visual above is built to prevent.
Frequently Asked Questions
How do I calculate peptide dosage after reconstitution?
Divide the total micrograms in the vial by the milliliters of bacteriostatic water you added to get concentration, then divide your target dose by that concentration to get the volume to draw. Multiply that volume by 100 to read it in syringe units.
What syringe size should I use for peptides?
A 0.3 mL (30-unit) insulin syringe gives the most precise reading for small doses under 30 units. For larger draws, a 0.5 mL or 1 mL syringe holds more volume without changing the unit scale — all three read 100 units per mL.
How much bacteriostatic water should I add to a peptide vial?
There's no single correct amount — it depends on how precise you want your draws to be. Adding more water lowers the concentration and increases the volume per dose, which is usually easier to measure accurately on a small syringe. 2 mL is the most common starting point for a 5 mg vial.
How many doses are in one peptide vial?
Divide the total micrograms in the vial by your per-dose amount in micrograms. A 5 mg (5,000 mcg) vial dosed at 250 mcg gives 20 doses, regardless of how much water was added — dilution changes the draw volume, not the total peptide amount.
Why does my draw amount show a capacity warning?
Each syringe barrel has a maximum volume — 30, 50 or 100 units. If your calculated draw is larger than that, either switch to a bigger syringe or add more bacteriostatic water to lower the concentration so the same dose takes up less volume.
Do mg and mcg matter when entering my dose?
Yes — most peptide doses are written in micrograms (mcg), not milligrams (mg), and mixing the two up is the single most common calculation error. This calculator's mcg/mg toggle exists specifically so you don't have to convert by hand.
Does bacteriostatic water expire once a vial is reconstituted?
Reconstituted peptides are generally more stable when refrigerated and used within the timeframe stated by the supplier or a lab reference — this varies by peptide and isn't something a dosage calculator can determine, so check the specific product documentation.
Can I use this calculator for more than one peptide at a time?
Run the calculator once per peptide, since each vial has its own strength and dilution. If you're stacking compounds, calculate each one separately and keep the draws in separate syringes unless you have a specific, verified compatibility reference.
For more reconstitution references and peptide-specific breakdowns, browse the full library at peptidescalculator.info.
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