Converting Round Duct Diameter to Area

Converting round duct areas to square feet and square meters

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circular duct

Duct Diameter  Area
(in) (mm) (ft2) (m2)
8 203 0.3491 0.032
10 254 0.5454 0.051
12 305 0.7854 0.073
14 356 1.069 0.099
16 406 1.396 0.130
18 457 1.767 0.290
20 508 2.182 0.203
22 559 2.640 0.245
24 609 3.142 0.292
26 660 3.687 0.342
28 711 4.276 0.397
30 762 4.900 0.455
32 813 5.585 0.519
34 864 6.305 0.586
36 914 7.069 0.657

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Related Topics

  • Ventilation - Systems for ventilation and air handling - air change rates, ducts and pressure drops, charts and diagrams and more

Related Documents

  • Circular Duct Sizes - Dimensions of circular ventilation air ducts
  • Duct Velocity - Calculate velocities in circular and rectangular ducts - imperial and SI-units - online calculator
  • Equivalent Diameter - Convert rectangular and oval duct geometry to a equivalent circular diameter - online calculator with imperial and SI-units
  • Hydraulic Diameter - Hydraulic diameter of ducts and tubes
  • Rectangular Duct Sizes - Dimensions of common rectangular air ducts used in ventilation systems
  • Rectangular and Circular HVAC Ducts - Equivalent Diameter - Equivalent diameters for rectangular and circular ducts - air flows between 100 - 50,000 cfm
  • Sizing Ducts - The ductwork of ventilation systems are often sized with either the Velocity, the Constant Pressure Loss (or Equal Friction Loss) - or the Static Pressure Recovery Methods

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