Formaldehyde PPM

Air concentration safety calculator.

Verified ToolUpdated: January 10, 2026
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PPM

Methodology & Sources

To convert mg/m3 to PPM for gases, we use the formula: PPM = (mg/m3 * 24.45) / Molecular Weight. Formaldehyde MW is 30.03.

The underlying formula used is:

mg/m3 * 24.45 / Molecular Weight (30.03)

References

  • NIOSH Pocket Guide to Chemical Hazards

Frequently Asked Questions

What is the safe limit?

OSHA PEL is 0.75 PPM (8-hour TWA).

Why 24.45?

24.45 is the molar volume of air at NTP (25°C, 1 atm).
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