Pipe Pressure Drop Calculator

Ever noticed how water flows slower in a long hose? That’s pressure drop in action. As fluid moves through a pipe, it loses pressure due to friction and obstacles. This drop affects water, air, and gas systems, making it crucial for engineers, plumbers, and DIYers to measure.

Our Pipe Pressure Drop Calculator makes this easy. Just enter a few details, and you’ll get an instant result!

Why Does Pressure Drop Matter?

A high pressure drop can cause:

• Slow or weak water flow
• Inefficient heating and cooling systems
• Increased energy costs
• Equipment damage

If your pressure drop is too high, you may need larger pipes, shorter routes, or smoother materials like PVC.

How to Use the Pipe Pressure Drop Calculator

Using this tool is simple:

1. Choose the Pipe Type – Select PVC, steel, or copper.
2. Enter Pipe Diameter – Use inches or mm.
3. Set Pipe Length – Feet or meters.
4. Input Flow Rate – GPM, LPM, or CFM.
5. Select Fluid Type – Water, air, or gas.

Hit Calculate and get the pressure drop instantly!

The Pressure Drop Formula

The Darcy-Weisbach equation is widely used:

ΔP = f × (L/D) × (ρ × v² / 2)

where:

• ΔP = Pressure drop (Pa or psi)
• f = Friction factor
• L = Pipe length
• D = Pipe diameter
• ρ = Fluid density
• v = Flow velocity

For water, the Hazen-Williams equation works well:

ΔP = 4.52 × (Q^1.85 / C^1.85 × D^4.87) (for GPM and feet)

or

ΔP = 10.67 × (Q^1.85 / C^1.85 × D^4.87) (for L/s and meters)

This equation makes pressure drop easy to estimate.

How Much Pressure Drop Per 100 Feet?

Bigger pipes reduce pressure loss, making them ideal for high-flow systems.

Common Questions

How do you calculate pressure drop?

Use the Darcy-Weisbach or Hazen-Williams equation. Or, just use our calculator for quick results!

Does pressure drop increase with pipe size?

No. Larger pipes lower pressure drop by reducing friction.

What’s the rule of thumb for pressure drop?

A 5 psi drop per 100 feet is often used for water systems.

Can I use this for air pressure drop?

Yes! It works for water, air, gas, and other fluids.

Final Thoughts

Pressure drop affects flow efficiency, energy use, and system life. Our Pipe Pressure Drop Calculator simplifies complex calculations, helping you design better piping systems. Whether you’re a professional or a DIY enthusiast, this tool saves time and ensures accuracy!