Science
Gas Density Calculator
Use this gas density calculator for ideal-gas chemistry problems with pressure in kPa, molar mass in g/mol, and temperature in kelvin.
Choose the missing quantity; the calculator hides that field and solves it from the others.
Solved value
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- Gas density
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- Pressure
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- Molar mass
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- Temperature
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Study path
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What the gas density calculator solves
Use this gas density calculator for ideal-gas chemistry problems with pressure in kPa, molar mass in g/mol, and temperature in kelvin.
Formula
How to use it
- Choose the quantity you want to solve for.
- Enter the known values with consistent units.
- Check the rearranged formula, substitution, and warnings before using the result.
How to read the answer
At fixed pressure and molar mass, warmer gases have lower density in the ideal-gas model.
Common mistakes and edge cases
- Use kelvin for temperature.
- Use an R constant matching kPa, liters, and moles.
- Real gases can differ at high pressure or low temperature.
Worked examples
Air-style gas estimate
Solved value
Gas density = 1.1842 g/L
Find molar mass
Solved value
Molar mass = 30.5801 g/mol
Frequently asked questions
Can the gas density calculator solve for a missing variable?+
Yes. Use the solve-for control to hide the missing value, then enter the other known values with compatible units.
Why do the units matter?+
Formula calculators assume the entered values are already in matching units. Convert first when your measurements use mixed systems.
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Last updated: May 15, 2026