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PPM to µg/m³

The PPM to µg/m³ calculator converts a gas-phase volume fraction into a mass concentration using molecular weight, temperature, and pressure.

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Fill in the required fields to calculate your result. Your inputs are used only for this calculation.

What is the PPM to µg/m³?

This conversion is useful in air-quality and industrial-hygiene contexts where gas concentrations may be reported in PPM but exposure or monitoring data are expressed as mass per cubic meter.

The calculator applies the ideal-gas relationship: µg/m³ = (PPM × molecular weight × pressure × 1,000) ÷ (R × temperature in kelvin).

µg/m³ = (PPM × MW × P × 1,000) ÷ (R × T)

How to use this calculator

  1. Enter gas concentration in PPM.
  2. Enter molecular weight in g/mol.
  3. Enter temperature in °C.
  4. Enter absolute pressure in atm.
  5. Review the calculated µg/m³ value and conditions.

Worked example

For a gas at a stated molecular weight, temperature, and pressure, the tool converts the volume fraction to a mass concentration without treating PPM as a universal mg/L unit.

Where this calculation is useful

The PPM to µg/m³ can be useful for students, laboratory users, environmental professionals, engineers, and anyone working with trace concentrations when the concentration basis matches the method described above.

  • Air-quality calculations
  • Industrial hygiene
  • Gas monitoring
  • Environmental engineering

Common mistakes to avoid

  • Using gauge pressure instead of absolute pressure
  • Entering Celsius directly into the gas-law equation
  • Using the wrong molecular weight
  • Treating gas PPM as liquid PPM

Assumptions

Assumes ideal gas behavior at stated pressure and temperature.

Limitations

Non-ideal real gas deviations occur at high pressure and cold temperatures.

Formula explained

Uses ideal gas law (PV=nRT) to convert volume fractions to mass per cubic meter.

The calculator applies the ideal-gas relationship: µg/m³ = (PPM × molecular weight × pressure × 1,000) ÷ (R × temperature in kelvin).

PPM to µg/m³ FAQs

How do you convert PPM to µg/m³?

For gases, the conversion uses molecular weight, absolute temperature, pressure, and the ideal-gas relationship.

Why do I need molecular weight?

PPM is a volume fraction for gases, while µg/m³ is a mass concentration. Molecular weight connects moles to mass.

Does temperature affect PPM to µg/m³?

Yes. The ideal-gas relationship means the mass concentration corresponding to a fixed volume fraction changes with absolute temperature and pressure.

What pressure should I use?

Use absolute pressure, not gauge pressure.

Can I use 25 °C and 1 atm?

Yes when those are the conditions relevant to your measurement or comparison.

Is the ideal-gas equation exact?

It is an approximation. Real-gas behavior can matter at sufficiently high pressures or other non-ideal conditions.

Related calculators

Use these tools when you need the reverse conversion, a neighboring concentration unit, or the next step in a dilution or chemistry workflow.

µg/m³ to PPMConvert gas mass concentration (µg/m³) to volumetric PPM.PPM to MolarityConvert concentration from PPM to Molarity (moles/L).mg/L to PPMConvert milligrams per liter (mg/L) to PPM considering liquid density.PPM to mg/LConvert Parts Per Million (PPM) to milligrams per liter (mg/L).

Need another PPM calculation?

Calculator inputs are used only to produce the result. Do not enter confidential laboratory or client information.

Open the main PPM Calculator →