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Popular LabKit – Free Lab Calculators

Everyday laboratory and pharma QC calculations done right: molarity and dilutions, buffer preparation, volumetric solution factors, assay, %RSD, loss on drying, Karl Fischer water, molecular weight, HPLC system suitability, content uniformity, dissolution, rotary evaporator settings and chiller sizing, vacuum and centrifuge speed – plus ready-made buffer and reagent recipes. Each calculator shows its formula and a worked example, and gives a printable record for your lab notebook.

Calculators

Molarity, Normality & DilutionGrams to weigh, C₁V₁ = C₂V₂, dilution of concentrated acids, % w/v and ppm.SolutionsBuffer Preparation CalculatorGrams of each salt for 11 buffers – phosphate, Tris, citrate, HEPES, PBS and more – at any pH.BuffersVolumetric Solution FactorFactor and actual strength from standardisation titrations, with replicates and %RSD.TitrationQC Calculations Pack% RSD, HPLC/UV assay, titration assay, loss on drying and Karl Fischer water.Pharma QCMolar Mass CalculatorMolecular weight of any formula, including hydrates, with % composition.ChemistryLab Unit ConverterPressure and vacuum (mbar, Torr, inHg), temperature, centrifuge rpm ⇄ g.ConvertersHPLC System SuitabilityPlates, tailing, resolution, k′ and replicate %RSD.HPLCContent Uniformity (AV)Acceptance value by assay or weight variation, Stage 1 and 2.TabletsDissolution Calculator% dissolved with S1–S3 check, release profile and f2.DissolutionRotary Evaporator CalculatorBath, vacuum and coolant for 47 solvents; boiling point under vacuum.Rotary evaporationLab Recipe Finder28 buffer and reagent recipes, scaled to your volume.RecipesRotary Evaporator Solvent LibraryBath temperature and vacuum for 47 solvents, with a 1-page PDF.Rotary evaporation

Buffer & reagent recipes

Ready-to-use recipes with exact amounts for every common hydrate – each opens the calculator pre-filled.

Phosphate buffer pH 6.8Grams of each salt for 0.05–0.2 M, every hydrate.RecipePhosphate buffer pH 7.4Sodium and potassium phosphate, 0.05–0.2 M.RecipePBS (1X and 10X)Phosphate-buffered saline, pH 7.4, any hydrate.RecipeTris-HCl buffer pH 8.0Tris base + 1 M HCl, with the temperature effect.RecipeAcetate buffer pH 4.5Glacial acetic acid + sodium acetate, 0.05–0.2 M.RecipeCitrate buffer pH 6.010 mM to 0.1 M, incl. antigen-retrieval buffer.RecipeCarbonate–bicarbonate pH 9.6ELISA coating buffer, 0.05 and 0.1 M.Recipe0.1 N sodium hydroxidePreparation and standardisation with KHP.Recipe0.1 N hydrochloric acidFrom 37% HCl, standardised with Na₂CO₃.Recipe0.1 N sodium thiosulphatePreparation and iodometric standardisation.Recipe

Why use Popular LabKit?

  • Shows the working: every result comes with its formula and a worked example you can check by hand.
  • Printable record: print any result with inputs, date and calculated-by / checked-by lines.
  • Made for Indian labs: examples and units used in pharma QC, college and research labs.
  • Fast and private: calculations run on your device; nothing you type is sent anywhere.

Tip: bookmark this page or add it to your phone’s home screen so it is one tap away at the bench.

Free tool by Popular Traders, Ambala · Laboratory equipment makers since 1942Need lab equipment? Talk to us →