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CO₂ Room Risk Calculator

Estimate a room-average carbon dioxide concentration from released CO₂ mass, room volume, temperature, pressure and initial background.

Mass-to-volume conversionTwo simplified room modelsNIOSH and OSHA references

Enter the CO₂ release scenario

Convert released CO₂ mass to gas volume using the ideal gas law.

Well-mixed screening

Released CO₂ mass (kg)

Room volume (m³)

Gas temperature (°C)

Absolute pressure (kPa)

Initial CO₂ (ppm)

Simplified room model

Estimated room concentration

Reference bands are informational and do not replace a site assessment.

Estimated CO₂ concentration—

Percent by volume—

Released gas volume—

Release / room ratio—

Review inputs

The result will be compared with NIOSH and OSHA reference values.

OSHA / NIOSH TWA5,000 ppm

NIOSH STEL30,000 ppm

NIOSH IDLH40,000 ppm

CO₂ molecular weight44.01 g/mol

Real releases may stratify, remain cold, form local clouds or be affected by ventilation. Measure the atmosphere with suitable instruments.

How the tool works

Use the result as a screening estimate, not a dispersion model

Cold releases, dry ice, ventilation, release height and room geometry can create local concentrations that differ greatly from the average.

Convert mass to gas volume

The ideal gas law estimates the volume occupied by released CO₂.

Estimate the room fraction

The selected model combines the released volume with the initial room concentration.

Compare reference levels

The result is compared with listed occupational TWA, STEL and IDLH values.

Gas volumeV = (mass ÷ molecular weight) × R × T ÷ P

Replacement fractionx = background + (1 − background) × release/room

ppmppm = volume fraction × 1,000,000

Reference sources: NIOSH Carbon Dioxide Pocket Guide NIOSH Carbon Dioxide IDLH. Always verify project-specific values against the applicable SDS, instrument manual, standard and site conditions.

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