Fluid Flow Rate & Pipe Velocity Calculator — Free Online Calculator
Calculate pipe flow velocity, volumetric flow rate, or required pipe diameter using the continuity equation. Supports GPM and metric units.
✓ Formula verified: January 2026
Fluid Flow Rate & Pipe
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Flow Velocity
2.5531 ft/s (0.7782 m/s)
Pipe Cross-Section Area
3.1416 in²
Flow Rate (cu ft/s)
0.0557 ft³/s
What if your pipe inside diameter changes? 1.8 inches → 3.152 ft/s (0.9607 m/s) · 2 inches → 2.5531 ft/s (0.7782 m/s) · 2.2 inches → 2.11 ft/s (0.6431 m/s)
Scenario Comparison
Conservative (5%)
$16,470.09
$6,470.09 interest
Your scenario (7%)
$20,096.61
$10,096.61 interest
Aggressive (10%)
$27,070.41
$17,070.41 interest
High-risk (14%)
$40,224.71
$30,224.71 interest
Best return
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Flow Rate
Flow Velocity
2.5531 ft/s (0.7782 m/s)
Cross-Section Area3.1416 in²
Flow Rate0.0557 ft³/s
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