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Home / Calculators / Flow Rate Calculator

Flow Rate Calculator

Flow from size and velocity, size from flow. Flow rate (m³/h, L/s) or the required size.

Calculating…
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How do we calculate?

Flow Q = v × A, A = π × d² ÷ 4 (d = pipe inside diameter). For sizing, the required inside diameter is found and the first standard pipe with a larger inside diameter is selected.

Let us turn your calculation into a bill of materials

Send us the list from the calculator; we will quote flanges, elbows, tees, reducers, pipes and valves in a single offer, with EN 10204 3.1 material certificates.

This calculator is used in these sectors: Building services (HVAC & plumbing). All calculators →

Results are for preliminary selection and do not replace engineering design. Ask our technical team for the final selection.

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