Flow Rate Calculator
Calculate volumetric and mass flow rates through AN hose lines for any fluid type and dash size. Set flow velocity to determine litres per hour, US gallons per hour, cc/min and mass flow. Includes Reynolds number for laminar vs turbulent flow analysis.
Fluid Type
AN Dash Size
Flow Velocity
Typical ranges
Flow Results — AN-8 12.7mm bore @ 3.0 m/s · Petrol / Gasoline
Volumetric Flow
1368.1
L/h
US Gallons/Hour
361.42
GPH
Litres/Minute
22.80
L/min
cc / Minute
22802
cc/min
Mass Flow Rate
1012.40
kg/h
Bore Area
126.68
mm²
Reynolds Number
51,262
Turbulent
Chaotic flow. Higher pressure drop — typical in motorsport systems.
Re = ρ·v·D / μ | ρ = 740 kg/m³ · μ = 0.55 cP
All AN Sizes @ 3.0 m/s · Petrol / Gasoline
| Dash | ID (mm) | Flow (L/h) | Flow (GPH) | Flow (L/min) | cc/min | Reynolds |
|---|---|---|---|---|---|---|
| AN-3 | 4.8 | 195 | 51.6 | 3.26 | 3257 | 19,375 |
| AN-4 | 6.4 | 347 | 91.8 | 5.79 | 5791 | 25,833 |
| AN-6 | 9.5 | 766 | 202.2 | 12.76 | 12759 | 38,345 |
| AN-8 | 12.7 | 1368 | 361.4 | 22.80 | 22802 | 51,262 |
| AN-10 | 15.9 | 2144 | 566.5 | 35.74 | 35740 | 64,178 |
| AN-12 | 19.1 | 3094 | 817.5 | 51.57 | 51574 | 77,095 |
| AN-16 | 25.4 | 5472 | 1445.7 | 91.21 | 91207 | 102,524 |
| AN-20 | 31.8 | 8578 | 2266.0 | 142.96 | 142961 | 128,356 |
Methodology
Volumetric Flow: Q = A × v, where A is bore cross-section area (πr²) and v is fluid velocity. Assumes fully developed flow across the entire bore — real fittings and bends reduce effective flow slightly.
Mass Flow: ṁ = Q × ρ, using fluid density at approximately 20°C. Hot fuel or oil will have lower density and thus lower mass flow for the same velocity.
Reynolds Number: Re = ρvD/μ. Below 2 300 is laminar (smooth, predictable). Above 4 000 is turbulent (typical in fuel and oil systems). Most motorsport fluid systems operate in turbulent flow.
Velocity Guidelines: Fuel feed lines target 1.5–4 m/s. Return lines 0.5–1.5 m/s. Oil gallery lines up to 5 m/s. Exceeding these velocities increases pressure drop and noise.