Free online science and maths tools

Scans a DNA sequence for CpG islands using window size and GC content thresholds.

Calculates the molecular weight of a DNA or RNA sequence, single or double stranded.

Searches a DNA sequence for a pattern written with ambiguity codes and reports positions.

Strips characters that are not DNA bases from pasted text.

Finds approximate matches of a DNA query allowing a set number of mismatches.

Formats a DNA sequence into groups of bases with optional position numbers.

Computes percent identity and similarity for aligned protein sequences.

Builds an ambiguous DNA sequence that covers every codon possible for a protein.

Introduces a chosen number of random point mutations into a DNA sequence.

Suggests silent base changes that create a restriction site in a coding sequence.

Rewrites a one-letter protein sequence as three-letter amino acid codes.

Finds open reading frames in a DNA sequence across selected reading frames and start codons.

Aligns two DNA sequences with a global alignment and shows the result with match marks.

Aligns two protein sequences and reports the global alignment with identity and similarity.

Reports length, GC content and melting temperature for one or more PCR primers.

Simulates a PCR by locating primer binding sites on a template and listing the amplified products.

Maps primer binding sites onto a DNA template and shows where each primer anneals.

Computes the grand average of hydropathy for a protein sequence.

Estimates the isoelectric point of a protein from its amino acid sequence.

Calculates the molecular weight of a protein or peptide from its sequence.

Searches a protein sequence for a motif and reports where it occurs.

Generates random coding DNA sequences using a chosen codon usage table.

Generates random protein sequences of a chosen length and amino acid composition.

Cuts a DNA sequence with chosen restriction enzymes and lists the fragment sizes.