Bio Laboratory Calculators

Free bio laboratory calculators. Instant results, no login required.

8 tools available

Annealing 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.

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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.

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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.

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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.

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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.

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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.

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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).

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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.

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