Where curiosity
meets calculation

Calculate protein concentration from A280 absorbance using an extinction coefficient, path length, dilution factor, and molecular mass.

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.

Reverse, complement, or reverse-complement DNA and RNA sequences for PCR primers, cloning, and sequence analysis.

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 protein mass concentration and molar concentration, or between protein mass, moles, and molecule count.

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

Fit a BCA, Bradford, or Lowry protein assay standard curve with blank correction, replicate means, and unknown-sample interpolation.

Calculate buffer pH, the required conjugate base-to-acid ratio, and theoretical preparation amounts for a target pH.

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

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.

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