Calculator Directory
Molecular Biology Calculators
Practical calculators for protein, DNA, and RNA work.
Available tools8 live
A280 Protein Concentration Calculator
Calculate protein concentration from A280 absorbance using an extinction coefficient, path length, dilution factor, and molecular mass.
Buffer and Solution Recipes
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.
DNA & RNA Reverse Complement Tool
Reverse, complement, or reverse-complement DNA and RNA sequences for PCR primers, cloning, and sequence analysis.
FASTA Formatter and Sequence Cleaner
Clean, validate, reformat, convert, and print DNA, RNA, protein, and multi-FASTA sequences privately in your browser.
Nucleic Acid Mass Calculator
Convert DNA or RNA mass, moles, and molecule count using sequence composition or a length-based estimate.
Protein Molarity Calculator
Convert between protein mass concentration and molar concentration, or between protein mass, moles, and molecule count.
Protein Properties Calculator
Calculate protein pI, molecular weight, charge, amino acid percentages, aromaticity, GRAVY, and A280 extinction coefficients.
Protein Standard Curve Calculator
Fit a BCA, Bradford, or Lowry protein assay standard curve with blank correction, replicate means, and unknown-sample interpolation.
Biology tools for everyday lab planning
These calculators are built for common molecular biology tasks: converting between mass and molar amount, estimating molecular weight, checking DNA sequence orientation, cleaning and formatting FASTA records, and planning nucleic acid inputs for PCR, cloning, sequencing, and assay work.