Links to some useful tools for planning your peptide sequence

a. Translate Tool- www.expasy.ch/tools/dna.html
Translate is a tool which allows the translation of a nucleotide (DNA/RNA) sequence to a protein sequence

b. ProtParam tool- www.expasy.ch/tools/protparam.html
ProtParam (References / Documentation) is a tool which allows the computation of various physical and chemical parameters for a given protein stored in Swiss-Prot or TrEMBL or for a user entered sequence. The computed parameters include the molecular weight, theoretical pI, amino acid composition, atomic composition, extinction coefficient, estimated half-life, instability index, aliphatic index and grand average of hydropathicity (GRAVY) (Disclaimer).