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Ideal Gas Law Calculator

Solve the ideal gas equation PV = nRT for whichever variable you need — pressure, volume, temperature, or moles — given the other three. The foundational equation for any gas-phase chemistry or thermodynamics problem at moderate temperatures and pressures.

Pressure (P) (atm)

Volume (V) (L)

Temperature (T) (K)

Gas Constant (R)

Solve For

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Chemistry

Molarity Calculator

Calculate molar concentration (molarity, M) of a solution from moles of solute and total solution volume in litres. The most common concentration unit in chemistry, essential for stoichiometry, titrations, dilutions, and any lab calculation involving solutions.

Moles of solute (mol)

Volume of solution (L)

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Key differences

	Ideal Gas Law Calculator	Molarity Calculator
Category	Chemistry	Chemistry
Inputs required	5	2
Result	Calculated Value (varies)	Molarity (M)
What it does	Solve the ideal gas equation PV = nRT for whichever variable you need — pressure, volume, temperature, or moles — given the other three. The foundational equation for any gas-phase chemistry or thermodynamics problem at moderate temperatures and pressures.	Calculate molar concentration (molarity, M) of a solution from moles of solute and total solution volume in litres. The most common concentration unit in chemistry, essential for stoichiometry, titrations, dilutions, and any lab calculation involving solutions.