Ideal Gas Law Calculator
Solve the ideal gas law PV = nRT for any one of pressure, volume, amount, or temperature given the other three. Enter three of the four quantities (each with its own unit) and leave the one you want to find blank; the calculator solves for it and shows the result in several units. Includes standard and combined-gas-law variants when one quantity is held constant. Pairs with the Dew Point and Wavelength calculators for science work. Everything runs locally in your browser.
Result in other units
The ideal gas law PV = nRT uses the gas constant R = 8.314 J·mol⁻¹·K⁻¹ with SI base units (pascals, cubic metres, moles, kelvin). It is a good model for dilute gases at moderate temperature and pressure; real gases deviate near condensation or at very high density. Leave exactly one field blank to solve for it. Conversions: 1 atm = 101325 Pa = 1.01325 bar = 760 mmHg ≈ 14.696 psi; 1 L = 0.001 m³; K = °C + 273.15. Everything runs locally — nothing leaves your browser.