Ideal Gas Law Calculator
Solve pressure, volume, amount or absolute temperature in the entered ideal-gas SI state.
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How to use Ideal Gas Law Calculator
The ideal-gas relation PV=nRT uses R=8.31446261815324J/(mol K), derived from the SI constants. Exactly one chosen quantity is solved from the other positive inputs.
- Enter pressure (pa), volume (m³), amount (mol), absolute temperature (k).
- Choose the stated convention and check the units and supported model.
- Calculate, inspect the result, then copy or download it.
Good to know
- Pascals,cubic meters,moles,Kelvin; all supplied/solved state quantities positive. Ideal-gas model only, with no nonideal phase, pressure-vessel or equipment guarantee.
- Runs locally. Text/JSON fields are capped at30,000 characters; stricter page-specific and numeric-string limits also apply. Numeric inputs are bounded to magnitude1e15 and nonzero magnitude at least1e-100 unless an exact-string mode states otherwise. Approximate summaries use12 significant digits; CSV numeric cells retain the complete stored value and potentially formula-like string cells gain a protective apostrophe; unsupported, non-finite or detected underflow states return an error.
Common questions
Does this remain accurate near a phase change or at high pressure?
The calculation only evaluates the ideal-gas equation. It does not establish whether a particular real material follows that model.
Is the input uploaded or saved?
No. The tool calculates inside this browser tab and provides a local download; it does not persist your input.
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