Pick what to solve, fill in the rest, and Q = A·v converts between volumetric flow, pipe area and velocity — pipe diameter is handled automatically.
Solve for flow rate, velocity or pipe diameter — just pick the unknown.
No need to compute πd²/4 yourself — the area is derived automatically.
L/s, m³/s, m³/h, gpm and mm, cm, m, in all convert.
See the area and the substituted equation, step by step.
Reynolds number builds directly on velocity and diameter.
Reynolds Number Calculator