GPM to Water Pressure Calculator by Tons of Concrete

Water Pressure Formula:

\[ P = \frac{V^2 \times \rho}{2 \times 144} \]

Water Pressure (psi):

Definition: This calculator estimates water pressure in psi based on water velocity and density using Bernoulli's equation.

Purpose: It helps hydraulic engineers, plumbers, and irrigation specialists determine pressure from flow velocity.

The calculator uses the formula:

\[ P = \frac{V^2 \times \rho}{2 \times 144} \]

Where:

Explanation: The formula converts velocity pressure to static pressure, accounting for unit conversion from lb/ft² to psi.

Details: Proper pressure estimation ensures adequate water flow, prevents pipe damage, and helps design efficient systems.

Tips: Enter water velocity in ft/s and density (default 62.4 lb/ft³ for water). All values must be > 0.

Q1: How do I convert GPM to velocity?
A: Velocity (ft/s) = (GPM × 0.002228) / (pipe radius in ft²)

Q2: Why is 144 in the formula?
A: It converts lb/ft² to psi (1 psi = 144 lb/ft²)

Q3: Does this work for other liquids?
A: Yes, but you must use the correct density for the specific liquid.

Q4: What's typical residential water velocity?
A: Usually 5-8 ft/s for supply lines, 2-5 ft/s for drainage.

Q5: How does pipe diameter affect pressure?
A: Smaller diameters increase velocity at same flow rate, increasing pressure drop.