The following table lists standard rectangular waveguide sizes and their frequency ranges:-

WG	EIA-WR	IEC-R	Fc1, GHz	Flo, GHz	Fhi, GHz	Fc2, GHz	A, in	B, in	A, mm	B, mm
00	2300	3	.257	0.32	0.49	.513	23.000	11.500	584.200	292.100
0	2100	4	.281	0.35	0.53	.562	21.000	10.500	533.400	266.700
1	1800	5	.328	0.41	0.625	.656	18.000	9.000	457.200	228.600
2	1500	6	.393	0.49	0.75	.787	15.000	7.500	381.000	190.500
3	1150	8	.513	0.64	0.96	1.026	11.500	5.750	292.100	146.050
4	975	9	.605	0.75	1.12	1.211	9.750	4.875	247.650	123.825
5	770	12	.766	0.96	1.45	1.533	7.700	3.850	195.580	97.790
6	650	14	.908	1.12	1.70	1.816	6.500	3.250	165.100	82.550
7	510	18	1.157	1.45	2.20	2.314	5.100	2.550	129.540	64.770
8	430	22	1.372	1.70	2.60	2.745	4.300	2.150	109.220	54.610
9A	340	26	1.736	2.20	3.30	3.471	3.400	1.700	86.360	43.180
10	284	32	2.078	2.60	3.95	4.156	2.840	1.340	72.136	34.036
11A	229	40	2.577	3.30	4.90	5.154	2.290	1.145	58.166	29.083
12	187	48	3.152	3.95	5.85	6.305	1.872	.872	47.549	22.149
13	159	58	3.712	4.90	7.05	7.423	1.590	.795	40.386	20.193
14	137	70	4.301	5.85	8.20	8.603	1.372	.622	34.849	15.799
15	112	84	5.260	7.05	10.0	10.519	1.122	.497	28.499	12.624
16	90	100	6.557	8.20	12.4	13.114	.900	.400	22.860	10.160
17	75	120	7.869	10.0	15.0	15.737	.750	.375	19.050	9.525
18	62	140	9.488	12.4	18.0	18.976	.622	.311	15.799	7.899
19	51	180	11.571	15.0	22.0	23.143	.510	.255	12.954	6.477
20	42	220	14.051	18.0	26.5	28.102	.420	.170	10.668	4.318
21	34	260	17.357	22.0	33.0	34.714	.340	.170	8.636	4.318
22	28	320	21.077	26.5	40.0	42.153	.280	.140	7.112	3.556
23	22	400	26.346	33.0	50.0	52.691	.224	.112	5.690	2.845
24	19	500	31.391	40.0	60.0	62.781	.188	.094	4.775	2.388
25	15	620	39.875	50.0	75.0	79.749	.148	.074	3.759	1.880
26	12	740	48.372	60.0	90.0	96.745	.122	.061	3.099	1.549
27	10	900	59.014	75.0	110	118.029	.100	.050	2.540	1.270
28	8	1200	73.768	90.0	140	147.536	.080	.040	2.032	1.016
29	7	1400	90.791	110	170	181.582	.065	.033	1.651	.826
30	5	1800	115.714	140	220	231.428	.051	.026	1.295	.648
31	4	2200	137.242	170	260	274.485	.043	.022	1.092	.546
32	3	2600	173.571	220	325	347.143	.034	.017	.864	.432
-	2	-	295.071	325	500	590.143	.020	.010	.508	.254

Abbreviations:
WG - British Waveguide Number
EIA - Electronic Industries Association (USA)
IEC - International Electrotechnical Commission
Fc1 - TE10 Cut-off Frequency
Flo - Lowest Recommended Usage ~1.25xFc1
Fhi - Highest Recommended Usage ~1.9xFc1
Fc2 - TE20 Overmode Frequency
A - Internal Width
B - Internal Height

Notes:
WRno = Internal width in inches x100
Fc1 and Fc2 are theoretically calculated from Width - may differ from other sources at high frequencies
Assumptions: c=2.99792458e+8 m/s, Er=1

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8-Apr-2021