ClarityKitFind a tool
Chemistry

Ideal Gas Volume Calculator

Find gas volume from moles, Kelvin temperature and absolute pressure.

Explicit units and model assumptionsLocal calculations with worked examples
Chemistry workspace
Chemistry workspace

Check the units, concentration basis and assumptions before interpreting the result.

See the method

Set up your calculation

Runs on your device

Your chemistry result

Your result

Let’s calculate.

Use the Calculate button to see your result.

Review the method below for assumptions and conventions.

How to use this tool

  1. Enter gas amount, temperature, absolute pressure.
  2. Select Calculate to view the result.
  3. Check the method and assumptions below before using the result.

The method, explained

V = nRT/P, using R = 8.31446261815324 kPa·L/(mol·K). Use absolute pressure and Kelvin temperature to obtain volume in liters.

A WORKED EXAMPLE

Using gas amount = 1 mol, temperature = 273.15 K, absolute pressure = 101.325 kPa, the result is 22.4139695 L. Change these example inputs to match your task; use the method above to check each step.

Understanding your result

The convention matters: at 273.15 K and 101.325 kPa, the ideal value is about 22.414 L. At 100 kPa it is about 22.711 L. Enter the conditions explicitly.

What to keep in mind

Assumes an ideal gas. Use absolute pressure, not gauge pressure; real gases deviate at high pressures and near condensation. Educational calculation only; use validated procedures for laboratory work.

Reference: OpenStax Chemistry 2e — chemical quantities and models

Common questions

What volume does one mole occupy at STP?

The convention matters: at 273.15 K and 101.325 kPa, the ideal value is about 22.414 L. At 100 kPa it is about 22.711 L. Enter the conditions explicitly.

Are my inputs uploaded?

No. This calculation runs in your browser without an account or an external API.

Methodology maintained by ClarityKit. How these tools are built and checked.