Translation (mRNA to Protein) Calculator

In molecular biology, translation is the process where a messenger RNA (mRNA) sequence is read in three-letter units called codons to build a chain of amino acids — a protein. Enter your mRNA sequence (using A, U, G, C), select a genetic code and reading frame, into the Translation (mRNA to Protein) Calculator to get the resulting amino acid sequence. Secondary outputs include protein length, estimated molecular weight, and the number of start and stop codons found.

Enter nucleotide sequence using A, U, G, C characters

Highlight AUG start codons in translation

Mark UAA, UAG, UGA stop codons

Results

Amino Acid Sequence

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Protein Length

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Estimated Molecular Weight

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Start Codons Found

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Stop Codons Found

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Results Table

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Frequently Asked Questions

What is the difference between DNA and mRNA translation?

mRNA translation converts messenger RNA sequences directly into amino acid sequences using the genetic code. DNA must first be transcribed to mRNA before translation can occur.

Which genetic code should I use for my organism?

Use the standard genetic code for most organisms. Choose mitochondrial codes for organellar genes, and organism-specific codes like mycoplasma for specialized bacteria.

What are reading frames and why do they matter?

Reading frames determine which nucleotides are grouped into codons. There are three possible frames, and choosing the wrong frame will produce completely different amino acid sequences.

How do start and stop codons affect translation?

Start codons (usually AUG) initiate protein synthesis, while stop codons (UAA, UAG, UGA) terminate translation. These define the boundaries of protein-coding sequences.

Why might my protein sequence contain stop codons in the middle?

Premature stop codons can indicate frame shifts, mutations, or that you're not in the correct reading frame. Check your sequence and try different frames.

What characters are allowed in mRNA sequences?

Only use A, U, G, and C nucleotides for mRNA sequences. The tool will ignore spaces and other characters, but ensure your sequence is accurate.

How accurate is the molecular weight calculation?

The molecular weight is estimated based on standard amino acid masses. For precise calculations, consider post-translational modifications and cofactors not included in this basic estimate.