Enter the mole percent, molar volume of the component, and the sum of (mole percent * molar volume of all components) into the calculator to determine the volume percent.

Mole Percent to Volume Percent Calculator

Use the gas tab for ideal gas mixtures and the liquid tab for a real estimated mole % to volume % conversion using molar volume or density and molecular weight.
Ideal Gas Mixture
Liquid Mixture Estimate
In an ideal gas mixture, mole fraction equals volume fraction. This tab converts the same composition into multiple gas-mixture formats and can also estimate partial pressure.
This tab estimates the conversion for a two-component liquid mixture. If you enter molar volume, it is used directly. Otherwise, molar volume is estimated as molecular weight divided by density.
Ideal Gas Results
Mole Percent
Volume Percent
Mole Fraction
Volume Fraction
PPMV
Partial Pressure
Liquid Mixture Results
Component A Mole Percent
Component A Volume Percent
Component B Mole Percent
Component B Volume Percent
Component A Molar Volume Used
Component B Molar Volume Used
Estimated Mixture Molar Volume
Component A Mole Fraction

Related Calculators

Mole Percent to Volume Percent Formula

The following formula is used to calculate the volume percent from the mole percent. 

V = (Mp * V_m) / Σ(M * V_m) * 100

Variables:

  • V% is the volume percent
  • M% is the mole percent
  • V_m is the molar volume of the component
  • Σ(M% * V_m) is the sum of (mole percent * molar volume of all components)

To calculate the volume percent, multiply the mole percent by the molar volume of the component, then divide by the sum of (mole percent * molar volume of all components), and multiply by 100 to convert to a percentage.

Mole Percent to Volume Percent Conversion Table (Ethanol in Water; V_EtOH ≈ 58.4 mL/mol, V_H2O ≈ 18.07 mL/mol)
Mole Percent (%) Volume Percent (%)
13.161
26.188
514.537
1026.422
1536.319
2044.689
2551.860
3058.073
3361.416
4068.300
5076.370
6082.900
6786.776
7088.292
7590.651
8092.820
8594.823
9096.677
9598.398
9999.688
Assumes a binary ideal mixture converting ethanol mole% to ethanol volume% with pure-component molar volumes: V_EtOH ≈ 58.4 mL/mol, V_H2O ≈ 18.07 mL/mol (25°C). Formula: vol% = 100 · [x·V_EtOH] / [x·V_EtOH + (1−x)·V_H2O], where x = mole%/100.

What is Mole Percent to Volume Percent?

Mole percent to volume percent is a conversion used in chemistry to express the concentration of a component in a mixture. Mole percent is the ratio of the number of moles of a component to the total number of moles of all components in the mixture, expressed as a percentage. Volume percent, on the other hand, is the ratio of the volume of a component to the total volume of the mixture, also expressed as a percentage. This conversion is particularly useful in gas mixtures, where the volume percent can be directly related to the mole percent through the ideal gas law.

How to Calculate Mole Percent to Volume Percent?

The following steps outline how to calculate the Mole Percent to Volume Percent.

  1. First, determine the mole percent (M%) of the component.
  2. Next, determine the molar volume (V_m) of the component.
  3. Next, determine the sum of (mole percent * molar volume of all components) (Σ(M% * V_m)).
  4. Finally, calculate the volume percent (V%) using the formula V% = (M% * V_m) / Σ(M% * V_m) * 100.
  5. After inserting the values 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.

Mole Percent (M%) = 25%

Molar Volume of Component (V_m) = 22.4 L/mol

Sum of (Mole Percent * Molar Volume of All Components) (Σ(M% * V_m)) = 1000