Water Pressure Calculator — Calculate Water Pressure & Flow Rate

Water Pressure Calculator

Calculate water pressure, flow rate, and pipe specifications for optimal water system performance. Determine proper pressure based on pipe size, material, and system conditions.

Step 1: Pipe Specifications

Understanding Water Pressure

Water pressure is measured in PSI (pounds per square inch). Standard residential pressure ranges from 40-80 PSI. Higher pressure improves flow but increases pipe stress.

Step 2: Flow & System Conditions

5 GPM
10 ft
60°F

About Water Pressure Factors

Water pressure is affected by pipe diameter, length, material roughness, flow rate, and elevation changes. Larger diameter pipes reduce friction loss and maintain higher pressure.

Water Pressure Results

Summary
Pipe Comparison
Breakdown

Calculated Water Pressure

45.2 PSI
For 1″ copper pipe at 5 GPM flow
Flow Velocity
5.8 ft/s
Friction Loss
2.3 PSI
Pipe Diameter
1″
Pipe Material
Copper

Pipe Material Comparison

Pipe Material Roughness Factor Max Pressure Friction Loss

Pressure Loss Breakdown

Pressure Calculation Formula

Pressure = Static Pressure – Friction Loss – Elevation Loss

Static pressure is the initial system pressure. Friction loss depends on pipe material and flow rate. Elevation loss accounts for height changes (0.433 PSI per foot).

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