Where curiosity
meets calculation

Reverse, complement, or reverse-complement DNA and RNA sequences, including IUPAC codes and multi-record FASTA.

Clean, validate, reformat, convert, and print DNA, RNA, protein, and multi-FASTA sequences privately in your browser.

Convert DNA or RNA mass, moles, and molecule count using sequence composition or a length-based estimate.

Convert between mass and moles for proteins. Includes weight↔mole, molar concentration, and molecule count.

Calculate protein pI, molecular weight, charge, amino acid percentages, aromaticity, GRAVY, and A280 extinction coefficients.

A collection of common lab buffer and solution recipes — TE, TAE, TBE, PBS, TBS, TBST, SSC, SSPE, HEPES, and more — with concentrations and preparation steps.

Explore all 118 elements by name, symbol, atomic number, category, group, period, block, phase, and atomic weight.

Calculate molarity, required mass, final volume, or convert between % w/v and molarity for general solutions.

Plan a dilution series with tube concentrations, transfer volumes, diluent volumes, and a printable bench protocol.

Five dilution scenarios in one tool: C1V1=C2V2, stock spikes, back dilution, exact final volume, and mixing two solutions.