What gas constant (R) units are supported?

The calculator supports L·atm/mol·K, J/mol·K, m³·Pa/mol·K, L·kPa/mol·K, cal/mol·K, and cm³·mmHg/mol·K.

Can I input temperatures in Celsius?

Yes, you can select Celsius or Kelvin; the tool automatically converts Celsius to Kelvin internally for calculations.

How do I solve for a variable in the Ideal Gas Law mode?

Simply fill in the three known variables and leave the field for the unknown variable blank.

What does the Combined Gas Law mode calculate?

It solves for any single unknown initial or final state variable (P1, V1, T1, P2, V2, T2) when a gas changes state.

Can this tool calculate gas density?

Yes, by selecting the Density / Molar Mass mode and entering the mass, molar mass, pressure, and temperature.

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Gas Law Calculator

Solve pressure, volume, temperature, or moles with the Ideal Gas Law (PV=nRT) or Combined Gas Law; also gas density and molar mass.

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1 examples

1 mole of ideal gas at STP

1 mol, 1 atm, 273.15 K → V ≈ 22.4 L (molar volume at STP).

{"result":"V = 22.414 L (Ideal Gas Law, R = 0.082057 L · atm / mol · K).","metadata":{"result":{"solved":"V","value":22.414}}}

Inputs

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16 options

SettingsAdjust formats, ranges, numbers, and modes.16

Calculation ModeselectOptionalGas Constant (R) UnitsselectOptionalDetermines the pressure/volume units you must enter. Temperature is always converted to Kelvin internally.Temperature UnitselectOptionalPressure (P)numberOptionalLeave blank to solve for pressure in Ideal mode.Volume (V)numberOptionalLeave blank to solve for volume in Ideal mode.Temperature (T)numberOptionalLeave blank to solve for temperature in Ideal mode.Moles (n)numberOptionalLeave blank to solve for moles in Ideal mode.Initial Pressure (P1)numberOptionalInitial Volume (V1)numberOptionalInitial Temperature (T1)numberOptionalFinal Pressure (P2)numberOptionalFinal Volume (V2)numberOptionalFinal Temperature (T2)numberOptionalMolar Mass (g/mol)numberOptionalMass of gas (g)numberOptionalDecimal PlacesnumberOptional

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Gas Law Calculator

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Key facts

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How it works

Use cases

Examples

1. Calculating Molar Volume at STP

2. Predicting Gas Volume Change under Pressure

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