Amounts & solutions
Molar mass calculator
Type a chemical formula to get its molar mass, the mass of each element and its share, and grams for any number of moles.
Molar mass: 180.156 g/mol
Molarity calculator
Concentration in mol/L from moles or grams dissolved, or how many grams to weigh out for a target molarity.
Molarity: 0.0999 mol/L
Dilution calculator (C₁V₁ = C₂V₂)
How much stock solution to dilute to reach a target concentration and volume, or the concentration after diluting.
Stock to use (same volume unit): 62.5
Percent yield calculator
How much of the theoretical amount a reaction actually produced.
Percent yield: 82%
Gases
Ideal gas law calculator (PV = nRT)
Solve for pressure, volume, amount of gas or temperature from the other three.
Volume: 22.414 L
Combined gas law calculator
How pressure, volume and temperature of a fixed amount of gas change together; covers Boyle’s, Charles’s and Gay-Lussac’s laws.
Final volume V₂: 1.5153
Acids, decay & heat
pH calculator
Convert between pH, pOH and hydrogen or hydroxide ion concentration, with acidic, neutral or basic at a glance.
pH: 3.5
Buffer pH calculator (Henderson–Hasselbalch)
The pH of a buffer from the acid’s pKa and the base-to-acid ratio, or the ratio needed for a target pH.
pH: 4.936
Half-life calculator
How much of a radioactive isotope, drug or other decaying substance is left after a time, how long it takes to fall to an amount, or its half-life.
Amount left: 25
Heat energy calculator (q = mcΔT)
The heat needed to warm (or released by cooling) a mass of water, metal or other material by a number of degrees.
Heat energy: 334.72 kJ