Practitioner tool
ppm to mg/m³ Converter
Convert gas concentrations between ppmv and mg/m³ at the temperature and pressure you choose.
Ambient, workplace, and some stack standards use mg/m³ or µg/m³ instead of ppm. The conversion uses the molar volume at the stated conditions.
ppm to mg/m³ calculator
- Concentration
- 2.6183 mg/m³
- Concentration
- 2,618.3 µg/m³
Steps
- Molar volume = 0.0820574 × (25 + 273.15) ÷ 1 = 24.465 L/mol
- mg/m³ = 1 × 64.058 ÷ 24.465 = 2.6183
Questions engineers ask
Why does 24.45 appear in many formulas?
It is the molar volume in liters per mole at 25 °C and 1 atm. At other conditions the value changes, which is why this converter asks for temperature and pressure.
More converters: ppm to lb/hr, O2 correction, ppm to lb/MMBtu, lb/MMBtu to lb/hr, g/hp-hr to lb/hr, lb/hr to tons/yr, Wet to dry basis.
How this works
Formula
- mg/m³ = ppmv × MW ÷ V̂
- V̂ (L/mol) = 0.0820574 × T(K) ÷ P(atm)
Before you rely on the number
- Reference conditions differ between programs. Use the temperature and pressure the standard you are comparing against specifies.
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