May 26, 2025 | UR Gate

Ideal Gas Law Calculator (PV = nRT) – Solve for Pressure, Volume, Moles, or Temperature

Online, Tool, Easily calculate any variable in the Ideal Gas Law equation (PV = nRT). Just input three known values to instantly solve for the fourth. Supports multiple units for pressure, volume, and temperature. Includes optional step-by-step calculations.

The Ideal Gas Law Calculator helps you find pressure, volume, moles, or temperature using the famous equation PV = nRT. Just enter any three known values and select the variable you want to solve for.

🔹 Supports various units like atm, kPa, L, mL, °C, K

🔹 Automatically converts °C to K

🔹 Calculates instantly with precision

🔹 📘 Tip: You can view the full calculation process by clicking the "Show Calculation Steps" button.

Ideal Gas Law Calculator (PV = nRT)

Calculate for: Pressure (P) Volume (V) Moles (n) Temperature (T)

Pressure (P):

Volume (V):

Moles (n):

Temperature (T):

Show Calculation Steps

Calculation Steps:

Tool Features

Calculate pressure (P), volume (V), moles (n), or temperature (T) from PV = nRT.
Smart unit detection and auto-conversion.
Input in °C is converted to Kelvin automatically.
Supports these units:
Pressure: atm, kPa, mmHg, torr, Pa, bar
Volume: L, mL, cm³
Temperature: °C, K
Gas constant (R) automatically selected based on unit system.
Real-time results with 3-decimal precision.
Error prevention for invalid or missing inputs.
One-click “Copy Result” button.
Optional: Show full calculation steps for transparency.