Ducts - Cross-Sectional Area vs. Diameter

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 Diameter	Area
(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

• Area Converter

Download and print Circular Air Ducts Cross Sectional Area chart.

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