Codon Table & Translator
Translate between DNA, RNA, and protein sequences. Explore all 64 codons of the standard genetic code, visualize reading frames, find open reading frames, and learn amino acid properties.
Input Mode
Load a preset sequence:
| 1st | 2nd base | 3rd | |||
|---|---|---|---|---|---|
| U | C | A | G | ||
| U | UUU Phe | UCU Ser | UAU Tyr | UGU Cys | U |
UUC Phe | UCC Ser | UAC Tyr | UGC Cys | C | |
UUA Leu | UCA Ser | UAA Stop | UGA Stop | A | |
UUG Leu | UCG Ser | UAG Stop | UGG Trp | G | |
| C | CUU Leu | CCU Pro | CAU His | CGU Arg | U |
CUC Leu | CCC Pro | CAC His | CGC Arg | C | |
CUA Leu | CCA Pro | CAA Gln | CGA Arg | A | |
CUG Leu | CCG Pro | CAG Gln | CGG Arg | G | |
| A | AUU Ile | ACU Thr | AAU Asn | AGU Ser | U |
AUC Ile | ACC Thr | AAC Asn | AGC Ser | C | |
AUA Ile | ACA Thr | AAA Lys | AGA Arg | A | |
AUG Met | ACG Thr | AAG Lys | AGG Arg | G | |
| G | GUU Val | GCU Ala | GAU Asp | GGU Gly | U |
GUC Val | GCC Ala | GAC Asp | GGC Gly | C | |
GUA Val | GCA Ala | GAA Glu | GGA Gly | A | |
GUG Val | GCG Ala | GAG Glu | GGG Gly | G | |
Hover to highlight all codons for an amino acid. Click for details.
Amino Acid Lookup
About the Genetic Code
The standard genetic code maps 64 three-nucleotide codons to 20 amino acids plus 3 stop signals. This redundancy (degeneracy) means most amino acids are encoded by multiple codons.
AUG serves as both the start codon (initiating translation with methionine) and an internal methionine codon. The three stop codons (UAA, UAG, UGA) signal ribosome release.
Reading frame matters: shifting by even one nucleotide produces a completely different protein. Frameshift mutations are among the most disruptive genetic changes.
This tool uses the NCBI standard genetic code (Translation Table 1). Mitochondrial and some organisms use variant codes.