Reconstitution (concentration) calculator
This calculator divides an amount of material by a volume of liquid to give the resulting concentration. It is a unit-arithmetic tool for laboratory and educational context. It does not provide or imply any dose.
Formula
Concentration (mg/mL) = amount (mg) ÷ volume (mL). Concentration (mcg/mL) = concentration (mg/mL) × 1,000.
Worked example
Example only, using neutral numbers: 5 mg dissolved to a volume of 2 mL gives 5 ÷ 2 = 2.5 mg/mL, which is 2.5 × 1,000 = 2,500 mcg/mL. Doubling the volume halves the concentration; doubling the amount doubles it.
Background
Many peptides are supplied as lyophilized (freeze-dried) powder and are dissolved in a liquid before laboratory use. The concentration of the resulting solution depends only on the amount of material and the final volume. Stated amounts on vials refer to the labelled content; actual peptide content can be lower because of counter-ions, water, and impurities, which is why certificates of analysis report purity and peptide content separately.
Limitations
- Assumes final volume equals the diluent volume entered.
- Assumes the labelled amount equals the actual peptide content.
- Does not account for purity, counter-ions, or losses during handling.
- Provides concentration only; it gives no per-use output and no suggestion about amounts.
Frequently asked questions
What does this calculator compute?
It computes the concentration of a solution from two numbers: the amount of solid material and the volume of liquid it is dissolved in. The result is shown in milligrams per millilitre and micrograms per millilitre.
Does the calculator account for the volume of the powder itself?
No. It assumes the final volume equals the diluent volume entered. In practice, dissolved solids can change the final volume slightly, and labelled amounts can differ from actual content. Laboratory protocols account for this separately.
Why is there no per-use or per-injection output?
This site does not provide dosing information. The calculator reports concentration only, which is a property of the solution, and makes no suggestion about any amount, use, or administration.
What units can be entered?
Amount in milligrams and volume in millilitres. Use the peptide unit converter first if the amount is stated in grams, micrograms, or nanograms. Both values must be positive numbers.