Indoor air tools and guides

The tools use transparent formulas and do not require an account.

Calculate a target particle CADR from room volume and desired air changes per hour.

Check the effective ACH delivered by a device or calculate the airflow needed for a target ACH.

Estimate cooling capacity in kW and BTU/h from floor area, ceiling height, insulation, sun, occupants and equipment.

Estimate how much water is held in the room air above a target relative humidity.

Estimate the minimum water vapour required to raise relative humidity in the air volume.

Calculate daily, monthly and annual energy cost from power, runtime and tariff.

Estimate the ideal-mixing time needed to reduce a pollutant concentration at a known ACH.

Store temperature, humidity, CO₂, PM2.5 and notes locally, then export CSV or JSON.

Store devices and filter intervals, then download reminders as an ICS calendar.

Compare CADR, achieved ACH, power and annual running cost in the same room.

Enter readings to highlight areas worth checking: humidity, ventilation or particles.

Track cleaning of inlets, filters, tanks and sensors locally.

The key principle

Control the pollutant or moisture source first, provide appropriate ventilation, and treat filtration devices as supplemental.