Ideal Gas Law CalculatorIdeal Gas Law Calculator Solve for one variable in PV = nRT by providing the other three. * Use R = 0.0821 L·atm/(mol·K).Step 1: Enter Your Data Variable to Solve For: Pressure (P)Volume (V)Moles (n)Temperature (T) Pressure (atm): Volume (L): Moles (mol): Temperature (K): Calculate Unknown Variable Calculation Result Recalculate Share: