How do I calculate Pressure Drop in Compressed Air Hoses?

To calculate Pressure Drop in Compressed Air Hoses: Enter Hose internal diameter, Hose length, Supply pressure P1 and other values. Click Calculate. INDUGRID computes the result instantly using the formula: ΔP [bar] = λ × (L/D) × (ρ × v²/2) / 100,000 [Darcy-Weisbach]. No registration required.

What units does the Pressure Drop in Compressed Air Hoses calculator use?

The Pressure Drop in Compressed Air Hoses calculator uses the following units: mm, m, bar, nl/min. SI units are used by default.

Pneumatics

Pressure Drop in Compressed Air Hoses

Calculate pressure drop and flow capacity of a compressed air hose using the Darcy-Weisbach equation. Determines whether your hose is sized correctly.

Units:

in LinkedIn

💡Keep pressure drop in connection hoses below 0.3 bar. A 6mm bore hose at 3 metres already limits flow significantly. Each standard fitting (elbow, T-piece, quick connector) adds equivalent hose length: quick connector ≈ 0.2–0.5m equivalent.

ΔP [bar] = λ × (L/D) × (ρ × v²/2) / 100,000 [Darcy-Weisbach]

Input

Hose internal diameter iInternal bore diameter of the compressed air hose in mm. Standard sizes: 3, 4, 6, 8, 10, 12, 16 mm.

Hose length iTotal hose length in metres. Add equivalent lengths for fittings: elbow ≈ 0.3–0.8m, quick connector ≈ 0.2–0.5m, T-piece ≈ 0.5–1.5m.

Supply pressure P1 iGauge pressure at the inlet (supply side) of the hose in bar.

bar

Required flow iRequired flow rate through the hose in normal-litres per minute at the specified supply pressure.

nl/min

Result

Air velocity in hose [m/s] —

Reynolds number Re —

Pressure drop ΔP [bar] —

Pressure at hose outlet P2 [bar] —

Assessment —