Enter the radius and height of the drum into the calculator to determine the drum capacity. This calculator can also evaluate any of the variables given the others are known.

Drum Capacity Formula

The following formula is used to calculate the drum capacity.

DC = π * r² * h


  • DC is the drum capacity (kg)
  • π is a constant, approximately equal to 3.14159
  • r is the radius of the drum (cm)
  • h is the height of the drum (cm)

To calculate the drum capacity, multiply the square of the radius of the drum by the constant π, then multiply the result by the height of the drum. The result will give you the drum capacity in cubic centimeters, which can be converted to kilograms by considering the specific type of laundry (e.g., cotton, synthetic, etc.) and its typical weight per cubic centimeter.

What is a Drum Capacity?

Drum capacity refers to the maximum amount of laundry, in kilograms, that a washing machine or dryer can handle in a single cycle. It is an important specification to consider when purchasing a laundry appliance, as it determines how much laundry you can wash or dry at once. A larger drum capacity is typically more efficient for larger households or those who wish to do less frequent, but larger loads of laundry.

How to Calculate Drum Capacity?

The following steps outline how to calculate the Drum Capacity.

  1. First, determine the radius of the drum (r) in centimeters.
  2. Next, determine the height of the drum (h) in centimeters.
  3. Next, gather the formula from above = DC = π * r² * h.
  4. Finally, calculate the Drum Capacity.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

radius of the drum (r) = 10 cm

height of the drum (h) = 20 cm