Smarter tools for better science WellSptted

Lab tools for before and after the experiment

Molarity, dilutions, master mixes, centrifuge speeds, cell seeding, DNA and RNA concentration, plate layouts and curve fitting. Free lab calculators, no sign-up, works on your phone at the bench.

Molarity and mass

Work out how much to weigh, what concentration you made, or what volume you need.

mass = concentration × volume × MW
g/mol

Example loaded: NaCl (58.44 g/mol) at 150 mM in 500 mL.

Every calculator

Each tool has its own page you can bookmark or share. All of them work offline once the site is installed on your phone.

Built for accuracy, designed for the bench

Spotted something unexpected? Email [email protected] with the numbers you entered. How we check our calculators.

Who makes WellSpotted

WellSpotted is built by Steven Lamont, a Technical Director with 20 years' experience developing and testing lateral flow diagnostics. About WellSpotted.

Your data stays on your device

Everything is calculated in your browser. Nothing you type is sent to us, and there are no accounts or tracking cookies. Privacy.