FREE Hydraulic Hose Size, Pressure Drop and Calculator

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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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

Corey Rasmussen

Corey is the Managing Director of the Mentored Engineer and owner of Rasmussen Designs. He received his BSME from Baylor University and holds a professional engineering license in North Carolina and Texas. He has been an engineer since 2002 with extensive experience in engineering design, fabrication and troubleshooting. He specializes in mobile equipment, hydraulic systems and machine design. He has two patents

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