Tools index
Free bench calculators for sequences, moles, solutions and units. Each one shows its formula and working and cites its sources.
Average and monoisotopic molecular weight plus molecular formula for any peptide sequence, with terminal modifications and disulfide bonds.
Composition, net charge at any pH, isoelectric point, GRAVY hydropathy and extinction coefficient for a peptide sequence.
Count residues and peptide bonds, and convert a sequence between one-letter and three-letter amino-acid codes.
Convert between mass and amount of substance (moles) using molecular weight, and see the number of molecules.
Solve for mass, volume or molar concentration from the other two values and the molecular weight.
Plan stock solutions, dilutions and concentration series at the bench.
Topic page →Solve C1V1 = C2V2 for any one value, or plan a serial dilution with transfer and diluent volumes for each step.
Convert between molar units (M, mM, µM, nM) and mass-per-volume units (mg/mL, µg/mL, % w/v, ppm) using molecular weight.
Mass to weigh for a stock solution, or solvent volume for a weighed amount, with purity correction and aliquot planning.
Build a printable worksheet of stock and diluent volumes for a list or series of target concentrations.
Convert between kilograms, grams, milligrams, micrograms, nanograms and picograms without factor-of-1000 slips.
Convert volume, amount of substance, molar concentration, mass concentration and length units used at the bench.
Convert between Celsius, Fahrenheit and kelvin, with presets for common laboratory storage temperatures.
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