Solve P, V, n, or T in PV = nRT with automatic SI-safe unit conversion.
Introductory chemistry and physics
Your result
Enter your values and press Calculate to see your answer and all five solution steps.
PV = nRT
Common Mistakes
Using °C directly in PV = nRT. Convert to K first; this calculator does so automatically.
Entering gauge pressure instead of absolute pressure. Add atmospheric pressure when the problem gives a gauge reading.
Mixing pressure and volume units with an unmatched value of R. This calculator converts every accepted unit to SI before calculation.
Treating a real gas as ideal near condensation or at high pressure.
Assumptions and limitations
Supported scope: one equilibrium state of a nonreacting, approximately ideal gas. The calculator solves only P, V, n, or T and does not model gas identity, mixtures/partial pressures, humidity, reactions, phase changes, compressibility factors, or fugacity.
The calculation uses R = 8.31446261815324 Pa·m³·mol⁻¹·K⁻¹ internally. Displayed values use up to eight significant digits; report experimental answers with appropriate significant figures.
PV = nRT
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