Tools
Peptide calculators for the lab
Free, in-browser calculators for working with research peptides. Paste a sequence once and check its mass, charge, absorbance, molarity and solubility. Nothing is sent anywhere.
Molecular weight calculatorFormula, average and monoisotopic mass, and [M+H]+ ions for any sequence.Isoelectric point and charge calculatorpI, net charge at any pH and a charge curve, with three pKa sets.Extinction coefficient calculator (A280)Molar extinction coefficient at 280 nm and concentration from an A280 reading.Molarity calculatormg/mL to mM and µM, and the mass to weigh for a target concentration.Solubility calculatorCharge class, hydrophobicity and a solvent order to try, with stability flags.Molecular weight reference tableFormula, MW and CAS number for 32 catalog compounds, from PubChem.Amino acid tableCodes, residue masses, pKa, charge, hydropathy and modification mass shifts for the 20 amino acids.
Reference tools for laboratory research. Not for human or animal use.