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Standard Temperature and Pressure Gas Calculator — result sheet
Compare common standard-state conventions by calculating ideal-gas volume, mass, density, and molar volume for a chosen amount of gas.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: Ideal-gas volume V = nRT/P; gas mass = nM; density = mass/V; molar volume = RT/P, with temperature and pressure selected explicitly.
The phrase STP is used with more than one pressure convention, so the page makes the convention visible instead of assuming one country or textbook definition. It uses the ideal-gas law to report a reference volume and the entered molar mass to report mass and density.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Standard-state convention — 2 choices
- Amount of gas — mol; minimum 1.0E-6; maximum 1000000000
- Molar mass — g/mol; minimum 1.0E-6; maximum 1000000
Worked example
| Input | Value |
|---|---|
| Standard-state convention | iupac-100kpa |
| Amount of gas | 1 |
| Molar mass | 28.97 |
At 0 °C and 100 kPa, one mole occupies about 22.711 L and 28.97 g of the entered gas; density is about 1.275 g/L.
Assumptions and limits
- The selected temperature and pressure are reference conditions, not a live measurement of a gas cylinder or room.
- The gas is approximated as ideal and the amount and molar mass are positive.
- The molar mass is supplied by the visitor and is not inferred from a formula or composition.
- The two options intentionally distinguish 100 kPa from one standard atmosphere at 0 °C.
- Real-gas compressibility, humidity, mixture composition, vessel volume, and measurement uncertainty are not modeled.
- The result is a chemistry reference calculation, not a pressure-vessel, process, or transport approval.
- Use the convention required by the course, standard, laboratory, or supplier before comparing values.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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