Protein Molecular Weight Calculator

Calculate protein molecular weight from amino acid sequence or composition with post-translational modifications.

Protein Information

Use single letter codes: A, R, N, D, C, Q, E, G, H, I, L, K, M, F, P, S, T, W, Y, V

Number of disulfide bonds
Number of phosphate groups
Number of glycan chains

Results

Enter protein information to calculate molecular weight

Amino Acid Molecular Weights

Non-polar Amino Acids

  • • Alanine (A): 89.09 Da
  • • Isoleucine (I): 131.17 Da
  • • Leucine (L): 131.17 Da
  • • Methionine (M): 149.21 Da
  • • Phenylalanine (F): 165.19 Da
  • • Proline (P): 115.13 Da
  • • Tryptophan (W): 204.23 Da
  • • Valine (V): 117.15 Da

Polar & Charged Amino Acids

  • • Arginine (R): 174.20 Da
  • • Asparagine (N): 132.12 Da
  • • Aspartic Acid (D): 133.10 Da
  • • Cysteine (C): 121.16 Da
  • • Glutamine (Q): 146.15 Da
  • • Glutamic Acid (E): 147.13 Da
  • • Glycine (G): 75.07 Da
  • • Histidine (H): 155.16 Da
  • • Lysine (K): 146.19 Da
  • • Serine (S): 105.09 Da
  • • Threonine (T): 119.12 Da
  • • Tyrosine (Y): 181.19 Da