Chemistry calculators
6 free tools
Molarity, dilution, pH, and the ideal gas law — the formulas you keep rearranging in chemistry class, ready to run. Type in what you know and the calculator solves for whatever's left.
Moles and liters into molarity, and back — with an optional grams-to-moles step.
C1V1 = C2V2 — enter any three values and it solves for the fourth.
Turn [H+] into pH and pOH, or go from a pH value back to concentrations.
PV = nRT — enter any three of pressure, volume, moles, and temperature.
Actual yield against theoretical yield for the percent yield of a reaction.
Percent by mass of each element from its mass and the compound's total.
Frequently asked questions
Which chemistry calculator should I start with?
Follow the question in front of you. Prepping a solution? Reach for Molarity or Dilution. Working an acid-base problem? The pH Calculator. Dealing with a gas? Ideal Gas Law. Each one takes a couple of numbers and returns the rest.
What units do these calculators expect?
Standard lab units throughout — liters for volume, moles for amount, mol/L for molarity, atmospheres for pressure, and kelvin for temperature. Stick to those and the answers come out in the units your textbook uses.
Are the results exact?
The math is exact for the idealized formulas. Real solutions and gases bring in activity effects, non-ideal behavior, and measurement error, so treat these as clean textbook answers rather than lab-grade predictions.
Which of these tools pair up well?
A few natural combos: Molarity feeds straight into Dilution, pH sits next to both when you're prepping acids and bases, and Percent Yield pairs with Percent Composition when you're checking a reaction's output. Run them together when a problem spans more than one step.