Rna To Protein Length
Calculator
Results
- Amino acid residues
- 500
- Estimated protein mass (Da)
- 55,000
- Estimated protein mass (kDa)
- 55
- Codons translated
- 500
Biology and lab results
| Amino acid residues | 500 |
| Estimated protein mass (Da) | 55,000 |
| Estimated protein mass (kDa) | 55 |
| Codons translated | 500 |
formula-map diagram
- Amino acid residues
- 500
- Estimated protein mass (Da)
- 55,000
- Estimated protein mass (kDa)
- 55
- Codons translated
- 500
Formula breakdown
Formula
residues = nucleotides ÷ 3 ; MW ≈ residues × 110 Da= 500
Note
Simplified model: these results use standard textbook laboratory relationships and average constants (A260 = 1 for 50 µg/mL dsDNA, 617.96 g/mol per base pair, ~110 Da per amino acid, ideal exponential growth). Real samples vary with purity, contaminants, buffer, temperature and instrument calibration. Always confirm against your own standards and protocol; do not use for diagnostic or safety-critical work.
More in Biology and lab
See all →Frequently asked questions
How do you go from mRNA length to protein length?+
Each amino acid is encoded by a codon of three nucleotides, so the number of amino acids equals the coding sequence length in nucleotides divided by three, minus one for the stop codon, which is not translated into an amino acid.
Do I use the total mRNA length or just the coding sequence?+
Only the coding sequence (CDS) length should be used, since mRNA also includes 5' and 3' untranslated regions that are transcribed but not translated; using the full mRNA length instead of just the CDS will overestimate the protein length.
Why subtract one codon at the end?+
The final codon in the coding sequence is a stop codon (UAA, UAG, or UGA) that signals the ribosome to terminate translation and does not correspond to an amino acid in the finished protein, so it must be excluded from the amino acid count.
Does the resulting protein length include the initial methionine?+
Yes, the start codon AUG is translated into the first methionine of the polypeptide chain, which is included in the calculated length; that initial methionine may be enzymatically removed after translation in the mature protein, but the calculator reports the length of the initial translation product.
Why might the real protein be shorter than the calculated length?+
Post-translational processing such as cleavage of a signal peptide, removal of the initiator methionine, or proteolytic maturation can shorten the final functional protein relative to the length predicted directly from the coding sequence.