FREE Hydraulic Hose Size, Pressure Drop and Calculator

Written by Corey Rasmussen in Calculators,Hydraulics,Stress Flow / Hand Calcs Last Updated March 24, 2023

Never guess again what hose size to use! Automatically the proper hose size for any application. Simply input a few measurable variables and click Calculate.

This calculator adjusts for oil type and temperature. See how your hoses work in hot or cold temperatures!

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3 Essential Hydraulic Calculators
Oil Type Equivalent Roughness, ε (ft)
(0.0001 – 0.00015)
Operating
Temp °F		 Density (lb/gal)
Flow, Q (gpm) Kinematic Viscosity (cS)
Length, L (ft) Dynamic Viscosity (cP)
Hose Size
(in)		 Hose Area
(in^2)		 Velocity
(ft/s)		 Reynolds
Number		 Relative
Roughness		 Friction
Coefficient		 Pressure
Drop (psi)		 Power
(hp)
0.13
0.01
0.00
nan
0.000000
0.050
0
0.0
0.19
0.03
0.00
nan
0.000000
0.050
0
0.0
0.25
0.05
0.00
nan
0.000000
0.050
0
0.0
0.31
0.08
0.00
nan
0.000000
0.050
0
0.0
0.38
0.11
0.00
nan
0.000000
0.050
0
0.0
0.50
0.20
0.00
nan
0.000000
0.050
0
0.0
0.63
0.31
0.00
nan
0.000000
0.050
0
0.0
0.75
0.44
0.00
nan
0.000000
0.050
0
0.0
1.00
0.79
0.00
nan
0.000000
0.050
0
0.0
1.25
1.23
0.00
nan
0.000000
0.050
0
0.0
1.50
1.77
0.00
nan
0.000000
0.050
0
0.0
2.00
3.14
0.00
nan
0.000000
0.050
0
0.0
Notes:
1. Only good for fluid flow on earth.
2. Viscosities are based on generic empirical data and may not coincide to specific manufacturers formulas.
3. Target operating temperatures should be between 104°F and 120°F.
4. Viscosities are only accurate between 100°F and 212°F. Care should be taken for sizing hoses for use outside of this temperature range.
Suction Line: <5ft/sec
Return: Line: <10ft/sec, <2000 Reynolds
Pressure Line: <20ft/sec, <3000 Reynolds
Not Recommended: >20 ft/sec, >3000 Reynolds
Amazing Free Hydraulic and Pneumatic Cylinder Calculator

Corey Rasmussen

Corey Rasmussen is an award-winning professional engineer (NC and TX) with over 20 years of product design and development experience. He has two patents related to aerial lifts machinery, has advanced certifications in hydraulics and electronic controls, and specializes in designing mobile equipment. Corey is the principal engineer of Rasmussen Designs and is based out of Durham, NC.

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