Convert between volumetric flow rate, pipe area and fluid velocity.
Flow rate is area times velocity. Because area scales with the square of diameter, a pipe twice as wide carries four times the flow at the same velocity. Doubling pipe diameter quadruples capacity at constant velocity, which is why small increases in pipe size relieve bottlenecks so effectively.
Flow Rate
Q = A v, with A = π (d ÷ 2)²
Q = A v, with A = π (d ÷ 2)² Flow rate is area times velocity. Because area scales with the square of diameter, a pipe twice as wide carries four times the flow at the same velocity.
Doubling pipe diameter quadruples capacity at constant velocity, which is why small increases in pipe size relieve bottlenecks so effectively.
This calculator takes 3 inputs: Pipe internal diameter, Fluid velocity, Fluid density. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.