Peptide reconstitution calculator

How the reconstitution calculation works

Start with the amount in the vial, the volume of liquid added, and the target amount you want to calculate. Keep milligrams (mg), micrograms (mcg), millilitres (mL), and syringe units separate: they describe different quantities.

1. Find the concentration: divide the vial amount in mg by the liquid volume in mL. The result is mg/mL.
2. Use the same mass unit: 1 mg equals 1,000 mcg. If your target amount is in mcg, divide it by 1,000 before using a concentration in mg/mL.
3. Find the volume: divide the target amount in mg by the concentration in mg/mL. The result is a volume in mL.
4. Convert to syringe markings: multiply the volume in mL by the scale selected in the calculator. A U-100 scale has 100 units per mL; a U-40 scale has 40 units per mL.

Syringe units are not milligrams

A syringe marking represents volume on a particular scale, not the mass of peptide. The amount represented by that marking depends on the concentration. Check both the concentration and the syringe scale when comparing results.

What does the reverse calculation do?

Use the “Units → water” tab to calculate a liquid volume from the vial amount, target amount, and syringe marking you supply. Both tabs work from your inputs; their defaults and presets are examples, not instructions for use.

What this tool cannot establish

The result does not verify the contents of a vial, product quality, suitability for a person, or how a product should be prepared. It also does not determine which amount to use.

For context, read the lesson on sourcing and certificates of analysis, explore the peptide research library, or start with our research-reading checklist.