Lab calculators
Bench maths without the scrap paper. Every calculator shows the formula with your numbers in it, so you can check the arithmetic and copy it into your notebook. They run in your browser; nothing you type is sent anywhere.
Solutions
- Molarity calculatorMass to weigh for a target concentration, or the concentration of what you dissolved.
- Molar mass calculatorType a formula (hydrates and brackets work) and get g/mol with the element breakdown.
- Molality calculatorMoles per kilogram of solvent, the solute mass for a target, or a conversion from molarity.
- Osmolarity calculatorAdd up the particles from each solute to get mOsm/L for a buffer or medium.
- PPM and percent converterppm to mg/L, percent, ppb and molarity, plus % w/v and % v/v recipes.
Dilutions
- Dilution calculator (C1V1)Leave one of C1, V1, C2, V2 empty and get the missing value and the diluent volume.
- Serial dilution calculatorA tube-by-tube plan: concentration, transfer volume and diluent for each step.
Cells
- Hemocytometer calculatorCells per mL and viability from your counts, and the volume to seed a plate or flask.
- Doubling time calculatorDoubling time, population doublings and growth rate from two counts.
Instruments
- Centrifuge rpm to × g calculatorConvert between rpm and relative centrifugal force for your rotor radius.
- Beer-Lambert and A260 calculatorSolve A = εlc for any term, and DNA or RNA concentration and purity from A260.