Calculate mass, molar mass, or ideal-gas volume from two values. Choose 0 °C at 1 atm or 1 bar; gallons mean US gallons.

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Ideal-gas estimate. The substance must be gaseous at the selected conditions.

Grams To Stp Formula

The following rounded formula estimates ideal-gas volume at 0 °C and 1 atm (101.325 kPa).

V = (g / M) × 22.4

Variables:

  • V is the volume at STP (liters)
  • g is the mass of the substance (grams)
  • M is the molar mass of the substance (grams/mole)

To estimate gas volume at 0 °C and 1 atm, divide mass by molar mass and multiply by the ideal-gas molar volume: about 22.414 L/mol, often rounded to 22.4. IUPAC standard conditions use 1 bar (100 kPa), giving about 22.711 L/mol. The calculator uses the selected pressure and V = (g/M)RT/P; real gases can deviate.

Grams to Liters at STP Conversion Table (Nitrogen, M = 28.02 g/mol; rounded Vm = 22.4 L/mol at 0 °C, 1 atm)
Mass (g) Volume at STP (L)
10.799
21.599
53.997
107.994
1511.991
2015.989
2519.986
3023.983
4031.977
5039.972
7559.957
10079.943
12599.929
150119.914
200159.886
250199.857
500399.715
750599.572
1000799.429
20001598.858
Assumes an ideal gas at 0 °C and 1 atm using rounded Vm = 22.4 L/mol; calculator values use unrounded RT/P. Example shown for nitrogen (N₂), M = 28.02 g/mol. Formula: V(L) = (mass (g) / M) × 22.4. For N₂: 1 g ≈ 0.799 L.

What is Grams To Stp?

Grams to STP converts the mass of a gas to its estimated volume at specified standard temperature and pressure using its molar mass and the ideal gas law. The substance must be gaseous at those conditions; the calculation does not model condensation or other phase changes. Specify whether the pressure is 1 atm or the IUPAC standard 1 bar.

How to Calculate Grams To Stp?

The following steps outline how to calculate the Grams To STP using the formula: V = (g / M) * 22.4

  1. First, determine the mass of the substance (g).
  2. Next, determine the molar mass of the substance (grams/mole).
  3. Next, use the formula V = (g / M) * 22.4 to calculate the volume at STP (liters).
  4. Finally, calculate the Grams To STP.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

mass of the substance (g) = 50

molar mass of the substance (grams/mole) = 25