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Amino Acid Kilodalton Calculator . See predefined list, or select [other] and enter a mass. To answer your question, 9 amino acids would be around 990 da, which you could round up to 1 kda. Protein Molecular Weight Calculator from www.omnicalculator.com 3 sequences = 1 amino acid = 110 da. Nucleic acids and protein calculations spectrophotometric conversions. Enter 197.13 into the molecular weight (mw) box.