Peptide calculator · Free · Instant
Stop wasting $500 peptide vials on dosing math.
Enter your vial size, BAC water volume, and target dose. Get the exact syringe units to draw — with built-in presets for the most common peptides and warnings when precision drops below safe thresholds.
- Six built-in presets for the most common peptides (BPC-157, TB-500, GHK-Cu, Ipamorelin, Sermorelin, Semaglutide)
- Real-time concentration math — change BAC water volume and see the effect instantly
- Warns when the dose is too small to measure precisely or exceeds your syringe capacity
- Shows doses-per-vial so you know how long a vial will last
- Supports U-100, U-50, and U-30 insulin syringe sizes
Example
5 mg BPC-157 vial reconstituted in 2 mL BAC water, 250 mcg/day dose:
5 mg = 5,000 mcg total
5,000 / 2 mL = 2,500 mcg/mL
250 / 2,500 = 0.10 mL
→ 10 units on a U-100 syringe
20 doses per vial · 50-day supply at 1×/day
Peptide dosage calculator
mg vial → mL of BAC water → syringe units
Quick presets
mg of dry peptide per vial
mg
Volume to reconstitute with — more water = more dilute = larger syringe markings
mL
In micrograms (mcg). 1 mg = 1000 mcg.
mcg
Draw this much
10.0units on the syringe
= 0.100 mL at a concentration of 2,500 mcg/mL
Doses per vial
20
Reconstituted concentration
2.50 mg/mL
For educational use only. Compounded peptides are prescription medications in most jurisdictions. Self-administration without medical supervision carries risk. Confirm dose, sterility, and sourcing with a licensed clinician.
Background reading
Use this with the dosing playbooks
Frequently asked
Common questions
It uses a single equation: concentration = (vial mg × 1000) / BAC water mL = mcg per mL. Your dose in mL = target mcg / concentration. Then we convert mL to syringe units (a U-100 syringe has 100 units per 1 mL). Adjusting BAC water volume changes the concentration without changing the total peptide — useful when the dose is too small to measure precisely on the syringe.
U-100 (1 mL) is the most flexible for small peptide doses (50–500 mcg). U-50 (0.5 mL) gives finer markings if your dose is on the small end. U-30 (0.3 mL) is rarely needed unless you're micro-dosing. The calculator warns you if the dose falls under 2 units (too imprecise) or over the syringe capacity.
More water = more dilute = larger, easier-to-read syringe markings. Common targets: 2 mL for a 5 mg vial (concentration 2.5 mg/mL), 5 mL for a 50 mg vial (10 mg/mL). The calculator shows you the resulting concentration in real time so you can dial it in for your preferred syringe reading.
If your dose computes to less than 2 syringe units, you can't measure it reliably — even a small variation in plunger position changes the dose by a meaningful percentage. The fix is to dilute (add more BAC water) so the dose volume increases.
Legal status varies by country and peptide. Many therapeutic peptides (BPC-157, AOD-9604, ipamorelin) are on the FDA's Category 2 compounding restriction list in the US since April 2024 — meaning they can be prescribed by a clinician but not compounded en masse. Self-sourcing from gray-market vendors carries quality + legal risk. Use this calculator for education and verify dose + sterility with a licensed clinician.
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