How do I calculate Hydraulic Pipe Flow & Pressure Loss?

To calculate Hydraulic Pipe Flow & Pressure Loss: Enter Pipe internal diameter, Pipe length, Flow rate and other values. Click Calculate. INDUGRID computes the result instantly using the formula: Laminar: ΔP = (128 × η × L × Q) / (π × D⁴) | Turbulent: ΔP = f × L/D × ρv²/2. No registration required.

What units does the Hydraulic Pipe Flow & Pressure Loss calculator use?

The Hydraulic Pipe Flow & Pressure Loss calculator uses the following units: mm, m, l/min, cSt, kg/m³. SI units are used by default.

Is the Hydraulic Pipe Flow & Pressure Loss calculator free?

Yes. The INDUGRID Hydraulic Pipe Flow & Pressure Loss calculator is completely free, requires no account or login, and works on desktop and mobile browsers.

Hydraulics

Hydraulic Pipe Flow & Pressure Loss

Calculate pressure loss in a hydraulic pipe using the Hagen-Poiseuille equation for laminar flow and the Darcy-Weisbach equation for turbulent flow.

Units:

in LinkedIn

💡Keep flow velocity in hydraulic pressure lines below 4 m/s, and in return lines below 2 m/s to avoid excessive pressure loss and noise. Reynolds number below 2300 = laminar, above 4000 = turbulent.

Laminar: ΔP = (128 × η × L × Q) / (π × D⁴) | Turbulent: ΔP = f × L/D × ρv²/2

Input

Pipe internal diameter iInternal diameter of the hydraulic pipe in mm.

Pipe length iTotal pipe length in metres.

Flow rate iFlow rate through the pipe in litres per minute.

l/min

Oil viscosity (kinematic) iKinematic viscosity of hydraulic oil in centistokes. ISO VG 46 = 46 cSt at 40°C.

cSt

Oil density iDensity of hydraulic oil. Typical mineral oil: 850–900 kg/m³.

kg/m³

Result

Flow velocity [m/s] —

Reynolds number —

Flow regime —

Pressure loss ΔP [bar] —

Velocity rating —