When to use this calculator
Estimate absolute pressure for an ideal gas in a specified volume. An ideal-gas approximation using absolute temperature and absolute pressure.
Explore the gas laws calculators for other questions in this topic. For a related calculation, use the Ideal Gas Temperature Calculator: Recover ideal gas absolute temperature from pressure, volume and amount.
PUTTING IT INTO PRACTICE
Ideal Gas Pressure: a worked example
The values below are an illustrative example, not a recommendation. Replace them with measurements or assumptions that match your question.
| Input | Example value |
|---|---|
| Amount (mol) | 1 |
| Absolute temperature (K) | 298.15 |
| Volume (m³) | 0.024 |
| Result | 103,289.876232 Pa |
- Check the input labels and enter the example values above.
- Apply the relationship: Pressure = nRT ÷ V; R = 8.314462618 J/(mol·K).
- The result is 103,289.876232 Pa, rounded for display.
How to interpret your result
An ideal-gas approximation using absolute temperature and absolute pressure.
Gas-law ratios require absolute pressure and kelvin temperature. Hold the quantities specified by each law constant. Real gases can depart from ideal behaviour, especially at high pressure or low temperature.
Frequently asked questions
Can I enter Celsius in a gas-law temperature ratio?
No. Convert to absolute temperature in kelvins first. The Celsius zero point is not absolute zero.
How do I use the ideal gas pressure calculator?
Enter amount (mol), absolute temperature (k), volume (m³). The result updates automatically. Use the units shown beside each input; the example values illustrate the method.
Which formula does this calculator use?
Pressure = nRT ÷ V; R = 8.314462618 J/(mol·K).
What should I check before using the result?
An ideal-gas approximation using absolute temperature and absolute pressure.
How are results rounded?
Scalar numbers display up to six decimal places, with scientific notation for very large or small values. Text, fraction, date and schedule outputs use the format described on the tool. Intermediate calculations use JavaScript floating-point arithmetic. Keep sensible precision for your measurements.
Further reading
For background on this topic, see OpenStax: gases and the ideal gas law ↗. This is a topic reference, not an external review or endorsement of this tool.
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