Pipe Sizing Calculator
Size pipes based on flow rate and velocity limits
Design Parameters
Recommended Velocities:
• Supply Mains: 4-8 ft/s
• Branch Lines: 4-6 ft/s
• Suction Lines: 4-6 ft/s
• Discharge Lines: 6-12 ft/s
Pipe Size Results
Recommended Pipe Size
3"
ID: 2.981"
Size Calculation
Min. Diameter:2.021"Min. Area:3.208 sq inActual Area:6.979 sq in
Flow Properties
Actual Velocity:2.30 ft/sFlow Rate:50.0 GPMReynolds No.:46917Flow Regime:Turbulent
Velocity Assessment
Low (Quiet)
Friction Loss
0.33 ft/100ft
Sizing Formula:
D = sqrt((4 × Q) / (π × V))
Where Q = flow rate, V = velocity
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Editorial Note
MyCalcBuddy Editorial Team
This page is maintained as an educational calculator reference.
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Formula Source: Standard Mathematical References
by Various
🔄Last reviewed: May 2026
✓Formula checks are based on standard references and internal QA review.