Molarity calculator
For those of us who are mathematically challenged, we provide an easy-to-use molarity calculator to double check that your lab solutions are always made correctly.
The calculator solves for mass, volume, molarity, or molecular weight — enter any three; leave one blank. Uses C = m / (MW × V) with consistent SI conversions (g, mg, L, mL, M, nM).
Leave the field you want to calculate empty and fill in the other three; units can be mixed (for example mg with mL and M). Double-check critical stock solutions with a second calculation before preparing buffers or media in the lab.
Enter three positive numbers; leave the fourth field empty. The answer appears in that field and below. MW is assumed in g/mol (numerically equal to Da per mole for practical use).
Click Calculate after filling three fields.