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Calculation Machine

Indoor Pool Dehumidification Calculator

Moisture load and dehumidifier CFM for an indoor pool.

Reviewed by the Calculation Machine team · How we check our maths

Your values

ⓘ Live results

Results
Estimated evaporation
117 lb/hr
Equivalent moisture load
15.62 gal/hr
Approx dehumidifier airflow
2,925 CFM

Quick answer

Indoor pool evaporation rate depends on water surface area, activity level and the air-to-water temperature difference.

The formula

Evaporation (lb/hr) = A x (Pw - Pa) x (0.089 + 0.0782 V) / Y

Worked example

Worked example

Using the values the calculator loads with.

Inputs

  • Pool surface area800 sq ft
  • Activity levelRecreational swimming
  • Air-water temp difference5 F

Result

  • Estimated evaporation117 lb/hr
  • Equivalent moisture load15.62 gal/hr
  • Approx dehumidifier airflow2,925 CFM

How to use the Indoor Pool Dehumidification Calculator

  1. 1Measure the pool's water surface area.
  2. 2Choose the typical activity level of the space.
  3. 3Use the estimated evaporation rate to size a pool dehumidification unit.

Frequently asked questions

Why does activity level matter so much?

Splashing and moving water dramatically increases the exposed surface area for evaporation.

Do covers help?

Pool covers when not in use can cut evaporation and dehumidification load by 50-90%.

About this calculator