Enter the chimney capacity, diameter, and height into the calculator to determine the missing variable.

Chimney Capacity Calculator

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Chimney Capacity Formula

The following formula is used to calculate the chimney capacity for a given diameter and height.

V = (pi / 4) * D^2 * H

Variables:

  • V is the chimney capacity
  • D is the chimney diameter
  • H is the chimney height

To calculate the chimney capacity, multiply the square of the diameter by the height, then multiply by π/4.

What is a Chimney Capacity?

Chimney capacity refers to the volume of space within a chimney. This volume is crucial for determining the efficiency and effectiveness of the chimney in venting smoke and gases from a fireplace, stove, or furnace. The capacity is influenced by the diameter and height of the chimney, and it plays a significant role in ensuring proper draft and ventilation. A well-calculated chimney capacity ensures that smoke and gases are efficiently expelled, reducing the risk of backdrafts and improving the overall safety and performance of the heating system.

How to Calculate Chimney Capacity?

The following steps outline how to calculate the Chimney Capacity.


  1. First, measure the diameter of the chimney (D).
  2. Next, measure the height of the chimney (H).
  3. Next, calculate the chimney capacity using the formula V = (π / 4) * D² * H.
  4. Finally, calculate the Chimney Capacity.
  5. After inserting the values 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.

Chimney Diameter (D) = 1.5 m

Chimney Height (H) = 10 m