Peptide Reconstitution Calculator — Private Supply Peptides

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Get your target dose from a licensed provider. This tool does the arithmetic; it does not set your protocol.

Peptide amount in vial

How much peptide is in the sealed vial before reconstitution.

2 mg 5 mg 10 mg 15 mg 20 mg

Bacteriostatic water added

The volume of BAC water you'll draw and inject into the peptide vial.

1 mL 2 mL 3 mL 5 mL

Target dose per injection

The dose you're targeting per single injection — from your protocol.

100 mcg 250 mcg 500 mcg 1 mg

Calculate

10.0 units

Draw to this mark on a U-100 insulin syringe

2.50 mg/mL

Concentration

0.10 mL

Volume drawn

Total doses per vial

Which syringe should I pick?

The unit reading is identical across U-100, U-50, and U-30 insulin syringes — they use the same scale. A smaller barrel just spreads a small dose across more length, making it easier to read accurately.

1 unit = 0.01 mL

If your calculated draw is under 20 units, a 0.3 mL (U-30) barrel is easiest. Otherwise the 1 mL (U-100) is fine.

Why does the water volume change my units?

The vial always holds the same amount of peptide. Adding more water spreads it across more volume, so each mcg sits in more units. That's why 5 mg in 1 mL reads as half the units of 5 mg in 2 mL for the same target dose. It changes the measurement, not the dose.

Not medical advice

This tool converts a dose you've already been given into syringe units. It does not set your dose, confirm a peptide is appropriate for you, or replace a clinician. Get your target dose and full protocol from a licensed provider.

Common reconstitution ratios

Starting points from the research literature.

These are common study ratios, not recommendations. Click a row to load it into the calculator above. Always confirm your protocol with a licensed clinician.

Peptide	Vial	BAC water	Concentration	Example dose	→ Units (U-100)
BPC-157	5 mg	2 mL	2.5 mg/mL	250 mcg	10 units
TB-500	10 mg	3 mL	3.3 mg/mL	2 mg	60 units
Ipamorelin	5 mg	2 mL	2.5 mg/mL	200 mcg	8 units
CJC-1295 (no DAC)	2 mg	2 mL	1 mg/mL	100 mcg	10 units
Sermorelin	5 mg	2 mL	2.5 mg/mL	200 mcg	8 units
Tesamorelin	10 mg	2 mL	5 mg/mL	1 mg	20 units
Semaglutide	5 mg	2 mL	2.5 mg/mL	0.25 mg	10 units
Tirzepatide	10 mg	4 mL	2.5 mg/mL	2.5 mg	100 units
Retatrutide	10 mg	3 mL	3.3 mg/mL	2 mg	60 units
Epitalon	10 mg	2 mL	5 mg/mL	10 mg	200 units

The math behind it

How the calculator works.

The peptide dissolves evenly in the water you add, so concentration is simply the milligrams of peptide divided by the millilitres of water. Insulin syringes are marked in units, where 100 units = 1 mL.

The three formulas

Concentration (mg/mL) = vial_mg ÷ water_mL

Units to draw = (target_mcg ÷ (vial_mg × 1000)) × water_mL × 100

Doses per vial = floor((vial_mg × 1000) ÷ target_mcg)

Worked example. A 5 mg vial reconstituted with 2 mL of bacteriostatic water gives a concentration of 2.5 mg/mL, or 25 mcg per unit. A 250 mcg target dose is therefore 10 units on a U-100 syringe — 0.10 mL. The vial contains 20 doses at that size.

mcg ↔ mg conversion

1 mg = 1,000 mcg. A 5 mg vial holds 5,000 mcg; a 250 mcg dose = 0.25 mg. The dose input above accepts either unit — toggle the selector on the right.