There is no single answer to this question as the flow rate will vary depending on the specific application and fluid being used. However, there are some general methods that can be used to calculate flow rate.
One common method is to use the continuity equation: Q = AV, where Q is the flow rate, A is the cross-sectional area of the flow, and V is the flow velocity. This equation is most often used for calculating flow rates of liquids, but can also be used for gases under certain conditions.
Another common method is to use the Bernoulli equation: Q = \frac{dh}{dt}, where Q is the flow rate, h is the head (or pressure) of the fluid, and t is the time. This equation is most often used for gases, but can also be used for liquids under certain conditions.
There are also many other methods for calculating flow rate, depending on the specific application. For example, there are different methods for calculating flow rates in pipes, open channels, and closed channels.
You can find more information on calculating flow rate here:
https://www.engineeringtoolbox.com/flow-rate-d_840.html
https://www.pumpfundamentals.com/calculate-your-flow-rate/
