Science
Ideal Gas Law Calculator
Use the ideal gas law calculator for classroom gas problems with pressure in kPa, volume in liters, 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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- Pressure
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- Volume
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- Moles
- —
- Temperature
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Student quick launch
Grade planning, algebra checks, and formulas students reach for most.
Study path
Use this calculator with
Follow these when you want the formula behind the answer, a short lesson, or nearby tools in the same topic.
What the ideal gas law calculator solves
Use the ideal gas law calculator for classroom gas problems with pressure in kPa, volume in liters, 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
Ideal gas behavior is a model. It works best for many gases at moderate pressure and temperature.
Common mistakes and edge cases
- Temperature must be in kelvin.
- Use the R value that matches your units.
- Real gases can deviate from the ideal model.
Worked examples
Find pressure
Solved value
Pressure = 101.321 kPa
Find moles
Solved value
Moles = 0.4905 mol
Frequently asked questions
Can the ideal gas law 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