Ideal Gas Law Calculator
Solve PV = nRT for pressure, volume, temperature, or moles.
atm
L
K
mol
How it works
The ideal gas law is PV = nRT with R = 0.082057 L·atm/(mol·K). Pick the quantity to solve for; its input box is ignored. Temperature must be in kelvin (K = °C + 273.15). Example: 1 mol at 273.15 K and 1 atm occupies about 22.4 L.
FAQ
Is this calculator free?
Yes. No signup is needed and nothing you enter is stored.
Is the result exact?
Results are rounded for display. For financial, medical, or legal decisions, confirm with a professional.
Do my numbers leave my device?
No. The calculation runs in your browser.