Dehumidifier Size Calculator
Pint capacity for your room size and dampness level.
Reviewed by the Calculation Machine team · How we check our maths
Your values
ⓘ Live results
Results
- Recommended capacity
- 30 pints/day
- Model size to buy
- 30-pint
- Room volume
- 8,000 cu ft
- Drainage
- Bucket emptying is fine
Quick answer
Under DOE 2019 rules a moderately damp 1,000 sq ft room needs about a 25-pint dehumidifier; add 5 pints for every step wetter.
The formula
pints = base for area + dampness adjustment
Worked example
Worked example
Using the values the calculator loads with.
Inputs
- Room area1000 sq ft
- Dampness levelModerately damp — damp smell
- Ceiling height8 ft
Result
- Recommended capacity30 pints/day
- Model size to buy30-pint
- Room volume8,000 cu ft
- DrainageBucket emptying is fine
How to use the Dehumidifier Size Calculator
- 1Measure the room's square footage.
- 2Pick how damp the space feels or smells.
- 3Adjust the ceiling height if it isn't 8 ft.
Frequently asked questions
What size dehumidifier for a 1000 sq ft basement?
A 30-pint unit for moderate damp, or 40–50 pints if the walls sweat or there's standing water.
Why did pint ratings change?
DOE retested at 65 °F in 2019, so a modern 30-pint unit removes as much as an old 50-pint model.
About this calculator
- Built and reviewed by the Calculation Machine team · How we build and test calculators
- Report an error