MCQ ANALYTICS / SUNCAR
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Gas concentration converter

Convert between ppm, mg/m³, % vol. and % LEL for gas analysis calculations.

Reference tool Default setting: GOST/IEC mode for Russia and Kazakhstan, 20 °C, 101.3 kPa, Vm = 24.04 L/mol.

Input data

Select a substance, an input unit and the conditions for conversion between ppm and mg/m³.

% LEL is calculated only for substances with a listed lower explosive limit. For official documents, verify the LEL and exposure limits against the data sheet or SDS for the specific substance.

Results

All results are calculated from the same ppm equivalent.

ppm
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mg/m³
-
% vol.
-
% LEL
-

Quick reference

Common gas concentration units and conversion conditions.

ppm

Parts per million

Volume fraction: the number of parts of gas per million parts of the mixture.

mg/m³

Mass concentration

Depends on the substance’s molar mass, temperature and pressure.

% LEL

Fraction of the limit

The percentage of the lower explosive limit of the gas.