Bio Laboratory Calculators
Free bio laboratory calculators. Instant results, no login required.
8 tools availableAnnealing Temperature Calculator
Calculate the PCR primer annealing temperature (Ta) and melting temperature (Tm) instantly. Paste a primer sequence or enter base counts — supports both Wallace Rule and salt-adjusted formula.
Cell Dilution Calculator
Calculate exact volumes for cell dilutions using C₁V₁ = C₂V₂. Enter stock concentration, target concentration, and final volume to get stock and diluent volumes. Also supports serial dilution series with step-by-step tables.
Cell Doubling Time Calculator
Calculate cell population doubling time from two cell count measurements and elapsed time. Also includes a Population Doubling Level (PDL) calculator using the ATCC method for tracking cumulative cellular age across passages.
DNA Concentration Calculator
Calculate DNA concentration from A260 absorbance using Beer-Lambert extinction coefficients (50 for dsDNA, 33 for ssDNA, 40 for RNA). Includes 260/280 and 260/230 purity ratio interpretation and a ng/µL to nM converter.
Generation Time Calculator
Calculate bacterial generation time (doubling time) from initial and final population counts and elapsed time. Displays generation time, number of divisions, and growth rate constant.
Ligation Calculator
Calculate the correct amount of insert DNA for a ligation reaction using Insert (ng) = Vector (ng) × (Insert bp / Vector bp) × Molar ratio. Supports sticky and blunt end protocols with NEB-based recommendations and step-by-step protocol output.
Log Reduction Calculator
Calculate microbial log reduction from before/after colony counts, determine treatment time from D-values, or find surviving organisms from a target log reduction. Includes industry standards panel (3-log sanitiser, 4-log EPA, 5-log FDA, 6-log SAL).
Protein Concentration Calculator
Calculate protein concentration from A280 absorbance using extinction coefficients (BSA, IgG, lysozyme, custom), Warburg-Christian nucleic acid correction, or BCA/Bradford standard curves. Includes method comparison table.