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Ducts - Diameter and Cross-Sectional Area

Circular ducts and cross-sectional areas

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Circular ventilation ducts and cross-sectional areas - Imperial Units

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 0.164
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

Circular ventilation ducts and cross-sectional areas - Metric Units

Duct DiameterArea
(mm)(m2)(mm2)(in2)
63 0.003 3019 4.7
80 0.005 4902 7.6
100 0.008 7698 11.9
125 0.012 12076 18.7
160 0.020 19856 30.8
200 0.031 31103 48.2
250 0.049 48695 75.5
315 0.077 77437 120
400 0.125 125036 194
500 0.196 195565 303
630 0.311 310736 482
800 0.501 501399 777
1000 0.784 783828 1215
1250 1.225 1225222 1899
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