Ideal Gas Law Calculator
Solve the ideal gas law PV = nRT for any one variable — pressure, volume, amount of gas, or temperature — using R = 8.314 J/(mol·K) and SI units (Pa, m³, mol, K).
Inputs explained
- Solve for — Choose which variable to compute: pressure, volume, moles, or temperature.
- Pressure (Pa) — Absolute gas pressure in pascals (enter when not solving for pressure).
- Volume (m³) — Gas volume in cubic metres (enter when not solving for volume).
- Amount of gas (mol) — Number of moles of gas (enter when not solving for moles).
- Temperature (K) — Absolute temperature in kelvin (enter when not solving for temperature).
How to use it
- Fill in the fields above — each input has a hint describing exactly what to enter
- Press Calculate to get your result instantly, right on this page
- Copy the result, save the tool to favorites, or share and embed it anywhere
Understanding the result
Example: One mole of gas at 273.15 K in a 0.0224 m³ container exerts a pressure of about 101,383 Pa — roughly one atmosphere.
Frequently asked questions
Why must I enter values in SI units like pascals and cubic meters? The calculator uses R = 8.314 J/(mol·K), which is only valid when pressure is in pascals, volume in cubic meters, and temperature in kelvin, so entering atmospheres, liters, or Celsius directly would give a wrong result.
Does this account for real, non-ideal gas behavior? No, PV = nRT assumes an ideal gas with no intermolecular forces and negligible molecular volume, so results for gases at very high pressure or low temperature will deviate from real measured behavior.
Is the Ideal Gas Law Calculator free to use? Yes — it is completely free, with no sign-up, no download and no usage limits. You can use it as often as you need.
Is my data private? Yes. The calculation runs entirely in your browser — the values you enter are never sent to our servers, stored or shared with anyone.
What information do I need? Just the following: Solve for, Pressure (Pa), Volume (m³), Amount of gas (mol), Temperature (K). Each field includes a hint explaining exactly what to enter.
Can I use it on my phone? Yes — the tool is fully responsive and works on any device, and the same calculator is available in the EasyWorkCalcs mobile app.
Privacy
Everything you enter into the Ideal Gas Law Calculator is processed entirely in your browser. Nothing is uploaded, stored or shared — your data stays on your device.