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Peptide Reconstitution Calculator

Vial size + BAC water + target → exact syringe units.

Medication (optional — 30+ in library)

Peptide in vial (mg)

Reconstitution water (mL)

Target amount per draw

Syringe

Draw to

units

Volume to draw

0.1

At this amount

draws / vial

After one draw

4.75

mg left

Syringe · draw to 10 of 100 units

100

Each unit on a 100u · 1.0 mL syringe ≈ 25 mcg of this solution.

Concentration

2.5

mg / mL

Concentration

2,500

mcg / mL

Per U-100 unit

mcg / unit

Show the math

5 mg × 1000 = 5,000 mcg in the vial
2 mL × 100 = 200 U-100 units of liquid
5,000 mcg ÷ 200 units = 25 mcg per unit
250 mcg ÷ 25 mcg/unit = 10 units
10 units ÷ 100 = 0.1 mL
5,000 mcg ÷ 250 mcg = 20 draws per vial

Compare reconstitution volumes (5mg vial)

Water

mcg / unit

units for 250mcg

1 mL505

2 mL2510

2.5 mL2012.5

3 mL16.6715

5 mL1025

More water → lower concentration → more units for the same amount.

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How it works

1
Enter your vial
Pick a compound from the library (or type the mg yourself). It loads a common vial size you can change.
2
Add BAC water
Enter how many mL of bacteriostatic water you're reconstituting with. More water = lower concentration = more units per amount.
3
Set your target amount
Type the amount you want per draw in mcg or mg. The tool converts it to exact U-100 syringe units and shows it on a visual syringe.
4
Read units + doses per vial
You get units to draw, volume in mL, draws per vial, and the concentration — plus the full math, on demand.

FAQ

How do I calculate peptide reconstitution?

Concentration = total peptide ÷ water volume. In U-100 terms: mcg per unit = (vial mg × 1000) ÷ (water mL × 100). Units to draw = your target mcg ÷ mcg per unit. The calculator does all of this live and shows the working.

What is BAC water and how much should I use?

Bacteriostatic water is sterile water with a preservative used to reconstitute lyophilised peptides. How much you add is a math choice that sets concentration — there's no single right amount. The 'compare volumes' table shows how 1–5 mL changes the units per draw.

What does a syringe 'unit' mean?

On a U-100 insulin syringe, 100 units = 1 mL. So 'units' is just a fine volume scale. The tool maps your target amount onto that scale and draws it on a visual syringe.

Is this a dose recommendation?

No. This is unit-conversion math on values you enter. The library's reference ranges are shown only for orientation. It is educational and not medical advice.

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