Reference guide
Short answer
Peptide molecular weight (MW) is the mass of one mole of a peptide, usually reported in g/mol or Da. MW lets researchers convert between mass concentration (mg/mL) and molar concentration (mM or uM) for assay preparation.
Why MW matters
Two peptides with the same mass can contain different molecule counts if their molecular weights differ. Molar concentration normalizes by molecule count, which is often the more meaningful unit for receptor or binding assays.
Core conversion
Moles equal mass divided by molecular weight. In lab units: mmol = mass in mg divided by MW in g/mol. Molarity depends on volume: mM = 1000 x mass(mg) / [MW(g/mol) x volume(mL)].
HALO calculator
The HALO peptide calculator converts mass, volume, molecular weight, moles, and molarity in the browser for laboratory measurement. It is a research tool only and does not provide dosing guidance.
Direct answers
What units are used for peptide molecular weight?
Peptide MW is commonly reported in g/mol or Daltons (Da).
Why convert mg/mL to uM?
uM expresses molecule count per volume, which helps compare compounds with different molecular weights.
Does the calculator give dosing guidance?
No. It only performs laboratory unit conversions for research preparation.
Research use only. HALO materials and educational content are for qualified laboratory research only. Not for human or veterinary use.
