Laboratory calculators

How much powder do I weigh out for a solution at this concentration?

How much stock and how much diluent do I need?

How do I make a buffer at the pH I need?

My protocol says × g but my centrifuge is set in rpm — what speed do I use?

Convert between mass, molar concentration and volume for a solution.

Compute molar mass from a chemical formula, including hydrates.

Work out how much stock and diluent to combine for a target concentration.

Plan a dilution series and get the transfer volume for every step.

What to weigh out for a buffer, with the pKa corrected for temperature.

Convert between relative centrifugal field and rotor speed, for a stated radius.

Scale a recipe to a different batch size and keep every concentration the same.

Concentration and purity from A260, with the conversion factor made explicit.

How much stock to add to a culture, and what to weigh to make the stock.

Agarose to weigh for a gel, and which percentage resolves your fragment.