Free Venturi Meter Calculator
Calculate flow velocity in a Venturi meter from the pressure difference: v1 = sqrt(2 * dP / (rho * ((A1/A2)^2 - 1))).
Pa
kg/m3
m2
m2
Velocity at Wide Section
1.8257 m/s
Volume Flow Rate0.018257 m3/s
Velocity at Wide Section vs Pressure Difference
Venturi Meter
A Venturi meter measures flow rate by measuring the pressure drop in a constriction.
Formula
From Bernoulli + continuity (A1 v1 = A2 v2):
v1 = sqrt(2 dP / (rho ((A1/A2)^2 - 1)))
The flow rate is Q = A1 * v1.
Example Calculation
Water, A1 = 0.01 m2, A2 = 0.005 m2, dP = 5000 Pa.
- 01(A1/A2)^2 = (0.01/0.005)^2 = 4
- 02v1 = sqrt(2 * 5000 / (1000 * 3))
- 03v1 = sqrt(10000 / 3000)
- 04v1 = sqrt(3.333) = 1.826 m/s
- 05Q = 0.01 * 1.826 = 0.01826 m3/s
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