Reverse Peptide Calculator

Smart reconstitution for a clean syringe draw

Pick a clean syringe draw yourself, or let the optimizer choose the BAC water that lands on the roundest mark.

1 unit = 0.01 mL on a standard insulin syringe.

This calculator works backwards from a standard peptide calculator. Instead of asking "given my BAC water, how many units do I draw?", it asks "for the draw amount I want, how much BAC water should I add?"

Pick a clean, easy-to-read draw like 10, 20, or 50 units and it solves for the exact amount of BAC water to add, so your dose lands on a visible tick instead of an awkward 13 or 22. That makes it handy when reconstituting vials of varying mass while keeping a consistent, precise draw.

Quick converters

Micrograms ↔ Milligrams
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Milliliters ↔ Units
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Reverse peptide calculator reference

How this calculator works

A standard calculator asks how many units to draw given a BAC water volume. This one works backward: you choose the draw size you want, and it solves for the BAC water that produces it.

BAC water mL = (vial mg × draw units × 0.01) ÷ dose mg

The draw in units is first converted to milliliters (1 unit = 0.01 mL on a U-100 syringe). Worked example: a 10 mg vial, a 500 mcg (0.5 mg) dose, and a target draw of 25 units (0.25 mL) needs 2 mg/mL, so BAC water = 10 ÷ 2 = 5 mL.

When to work backward

Solving for BAC water is useful when you want a consistent draw size across vials of differing mass, or a draw large enough to measure precisely on your syringe. Pick the draw first, and the calculator tells you how much water to add.

Units & conversions

Doses are entered in micrograms or milligrams, where 1 mg = 1000 mcg. Syringe volume relates to draw as 1 mL = 100 units, so 0.01 mL = 1 unit. The on-page converters handle mcg–mg and mL–unit conversions directly.

Storing reconstituted peptides

Once reconstituted, most peptides are refrigerated and used within a defined stability window; light and repeated temperature cycling degrade them. See PepRecon's bacteriostatic water stability data for the measured findings.

Data handling and privacy

Calculations run in your browser. Values are not transmitted or stored unless you explicitly generate a share link.

Scope & safety

PepRecon is a research and education resource. This calculator and reference material are provided for informational purposes and are not medical advice; they do not establish a dosing recommendation. Consult a qualified clinician before use.

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