Chemistry

Ideal Gas Law Calculator

Solve pressure, volume, moles, or temperature with PV=nRT.

Last validated: 2026-02-14

Use this free online Ideal Gas Law Calculator to solve for pressure, volume, temperature, or moles using PV = nRT. It is useful for classwork, lab checks, design screening, and engineering sanity checks where units and assumptions must stay visible. The form focuses on Mode, Pressure (atm), Volume (L), Moles (mol), Temperature (K) and returns Ideal Gas Law Inputs, Result, so you can move from input to answer without setting up a spreadsheet or custom script. Run one realistic example, adjust the inputs, and compare how the result changes before you copy or share it. Check units and formula assumptions carefully; for safety-critical or code-governed work, validate the result with authoritative references.

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Input Pattern

Enter values in the left panel, keep units explicit, run the calculation, then copy or share the result. Invalid fields are highlighted immediately.

Ideal Gas Law Inputs

Use PV = nRT (R = 0.082057 L*atm/mol*K).

Result

Solved value: 1.223265

How to use this tool

Enter Mode, Pressure (atm), Volume (L), Moles (mol), Temperature (K) for the ideal gas law calculator, keeping units, dates, or text format consistent with the form labels.
Choose the relevant mode, unit, or option values before running so the output answers the right version of the question.
Click "Run the tool" and review Ideal Gas Law Inputs, Result for the primary output.
Verify units and assumptions, especially before using the result for design, lab, or safety-sensitive work.

Worked Example

Auto-generated from the tool's current default or entered inputs.

Example Inputs

Mode: find_pressure
Pressure atm: 1.0
Volume liters: 10.0
Moles: 0.5
Temperature k: 298.15
Gas constant: 0.082057

Expected Outputs

Pressure atm: 1
Volume liters: 10
Moles: 0.5
Temperature k: 298.15

Interpretation

Pressure atm is 1.0. Use this as a decision input, not as a standalone conclusion.
Volume liters is 10.0. Use this as a decision input, not as a standalone conclusion.
Moles is 0.5. Use this as a decision input, not as a standalone conclusion.
Confirm unit consistency and operational constraints before applying this result in production or field conditions.

Confidence and limitations

Outputs are deterministic formula results and depend entirely on input quality and units.
Results are for planning and learning; verify with domain standards before safety-critical use.
Assumes ideal conditions and clean stoichiometry; lab context can change real outcomes.

Formula References

Core chemistry equations such as PV=nRT, M=n/V, C1V1=C2V2, and pH definitions.
Assumes ideal solution/gas behavior unless noted.

Assumptions

Outputs are deterministic formula results and depend entirely on input quality and units.
Results are for planning and learning; verify with domain standards before safety-critical use.
Assumes ideal conditions and clean stoichiometry; lab context can change real outcomes.

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Ideal Gas Law Calculator

Input Pattern

Ideal Gas Law Inputs

Result

How to use this tool

Worked Example

Example Inputs

Expected Outputs

Interpretation

Confidence and limitations

Formula References

Assumptions

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