Pressure Drop Calculator
Darcy-Weisbach equation: ΔP = f(L/D)(ρv²/2). Calculate frictional pressure loss in pipes. Also estimates friction factor from Reynolds number.
Pressure Drop
--
psi
Velocity
--
ft/s
Reynolds Number
--
--
Friction Factor
--
Darcy
Flow Regime
--
Head Loss
--
ft
How this was calculated
Darcy-Weisbach: ΔP = f × (L/D) × (ρv²/2)
Reynolds Number: Re = ρvD/μ
Laminar (Re < 2300): f = 64/Re. Turbulent: Colebrook-White equation solved iteratively.
Head loss hL = ΔP / (ρg) = f(L/D)(v²/2g)
Need help with pipeline hydraulics, flowline sizing, or pressure analysis?
Book a free strategy call →Understanding Pressure Drop in Pipes
The Darcy-Weisbach equation is the most general method for calculating frictional pressure drop in pipe flow. It applies to both laminar and turbulent flow of any Newtonian fluid.
In petroleum operations, pressure drop calculations are essential for flowline sizing, artificial lift design, injection system design, and facility piping. The friction factor depends on Reynolds number and pipe relative roughness.
For turbulent flow, the Colebrook-White equation (or Moody chart) provides the friction factor. This calculator uses iterative solution of the Colebrook equation.
All calculations run in your browser. Built by Groundwork Analytics.