Use Protein MW From Length when you need to estimate protein molecular weight from residue count using the mean residue mass of 110 daltons. Enter Amino acid count using the definitions and units below so the result can be reproduced.

Amino acid count

An integer count or setting.

The published tool contract uses this rule: Estimate protein molecular weight from residue count using the mean residue mass of 110 daltons.^[1]

Molecular weight

The calculated molecular weight in Da.

The output is an estimate tied to the stated model and coefficients; it is not a direct measurement and should retain that label when reported.

Retain the original Amino acid count values and their units alongside the result. Oligo MW Approx is useful when you instead need to approximate single-stranded oligonucleotide molecular weight as nucleotide length times the average nucleotide mass of 330 grams per mole. Body Length Weight provides another view by helping you estimate cattle weight in kilograms from body length and chest girth with the same-family length formula.

• Oligo MW Approx

  Approximate single-stranded oligonucleotide molecular weight as nucleotide length times the average nucleotide mass of 330 grams per mole.

• Body Length Weight

  Estimate cattle weight in kilograms from body length and chest girth with the same-family length formula.

• Simple Protein pI

  Estimate protein isoelectric point from acidic and basic residue counts with a linear charge balance model clamped to two through twelve.