Drain Flow Rate Calculator


Calculating drain flow rate is crucial in various engineering and plumbing applications. To simplify this process, we’ll create a user-friendly drain flow rate calculation. This calculator allows users to input relevant data and obtain accurate results effortlessly.

How to Use:

  1. Enter the required parameters in the designated input fields.
  2. Click the “Calculate” button to initiate the calculation.
  3. The result will be displayed instantly, providing the drain flow rate based on the inputs.


The drain flow rate (Q) can be determined using the following formula:


  • Cd​ is the discharge coefficient.
  • A is the cross-sectional area of the drain.
  • g is the acceleration due to gravity (approximately 9.8 m/s²).
  • h is the height of the water above the drain opening.

Example Solve:

By plugging in these values, the calculator will yield the drain flow rate.


Q: What is the discharge coefficient (Cd)?

A: The discharge coefficient represents the efficiency of fluid flow through an orifice or opening.

Q: Can this calculator be used for any drain type?

A: Yes, as long as the parameters align with the provided formula, this calculator is versatile for different drain types.

Q: How precise are the results from this calculator?

A: The results are highly accurate, considering the precise formula used for drain flow rate calculation.


In conclusion, the drain flow rate calculator simplifies a crucial aspect of engineering and plumbing. With a user-friendly interface and accurate calculations, it proves to be a valuable tool for professionals in the field.

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