Peptide Research Calculator
A fast, precise utility for common laboratory calculations: solution concentration after reconstitution, C₁V₁ dilutions, mass and volume unit conversions, molarity, and serial dilution planning. Everything runs in your browser — nothing is stored or sent.
For laboratory and in vitro research calculations only. This tool is not intended for human dosing, administration, or medical guidance. Verify all calculations independently before use.
Concentration
Enter the peptide mass and the volume of solvent (e.g. bacteriostatic water) used to reconstitute it. Concentration = mass ÷ volume.
Dilution
Work out how much stock solution and diluent to combine using C₁V₁ = C₂V₂.
Unit Conversions
Enter a value and its unit to convert it across the common laboratory units.
Molarity
Molarity = moles ÷ litres, where moles = mass ÷ molecular weight.
Serial Dilution
Plan a step-by-step serial dilution. Each step transfers a fixed volume into fresh diluent to keep the same dilution factor at every stage.
| Step | Concentration | Stock transferred | Diluent added | Final volume |
|---|
How These Calculations Work
A short reference for the maths behind the tool. For deeper compound background, see the Peptide Research Hub.
Concentration
Concentration is simply mass divided by the volume it is dissolved in: C = mass ÷ volume.
Reconstituting 10 mg of peptide in 2 mL of solvent gives
5 mg/mL. Because 1 mg/mL equals 1 µg/µL, the same solution is also
5 µg/µL.
Dilution — C₁V₁ = C₂V₂
To dilute a stock, the amount of solute stays constant: concentration × volume before equals
concentration × volume after. Rearranged, the stock volume you need is
V₁ = (C₂ × V₂) ÷ C₁, and the rest of the final volume is diluent.
Molarity vs. mass concentration
Mass concentration (mg/mL) counts weight; molarity (mol/L) counts the number of molecules. Converting between
them requires the compound's molecular weight: moles = mass ÷ MW. Two
compounds at the same mg/mL can have very different molarity if their molecular weights differ.
Why units matter
The most common lab errors are unit slips: mixing mg with mcg (1 mg = 1000 mcg) or mL with µL (1 mL = 1000 µL). A single misplaced factor of 1000 changes a result by three orders of magnitude, so always confirm units before and after a calculation.
Reconstitution guidance for a specific compound is covered on each product page and in the Research Hub. Return to the homepage to browse the catalog.