Dipole Antenna Length Calculator

Use this calculator to find the dimensions of a Dipole antenna designed to operate at a specified wavelength. The wavelength is typically specified in meters or m.

As an example you might want to calculate the dimensions of a 40 meter dipole.

A half-wave dipole antenna is comprised of two quarter-wavelength conductors placed end to end [1].

This calculator gives the length of a half wave dipole antenna. Enter the Frequency and the tool will compute the antenna length (L).

Example Calculation

At a frequency of operation 1000 MHz, the dipole length (L) is 5.62 inches or 0.14 meters.

The dimensions are smaller than that of an antenna that operates at a lower frequency.

At a frequency of 100 MHz, the dipole length L is 56.4 inches or 1.4 meters.

Formula

The total length (L) of the dipole antenna is calculated as:

L = 468 / f

where f is the frequency in MHz.

f is calculated from the wavelength.

The length of each arm of the dipole

l = L/2

Table of Antenna Wavelength vs Antenna Length

The following table provides the physical antenna dimensions (length in feet) as a function of the wavelength.

Antenna Wavelength (m)	Dipole Length (L) in feet
1	1.6
2	3.1
3	4.7
4	6.2
5	7.8
6	9.4
7	10.9
8	12.5
9	14.0
10	15.6
11	17.2
12	18.7
13	20.3
14	21.9
15	23.4
16	25.0
17	26.5
18	28.1
19	29.7
20	31.2
21	32.8
22	34.3
23	35.9
24	37.5
25	39.0
26	40.6
27	42.1
28	43.7
29	45.3
30	46.8
31	48.4
32	50.0
33	51.5
34	53.1
35	54.6
36	56.2
37	57.8
38	59.3
39	60.9
40	62.4
41	64.0
42	65.6
43	67.1
44	68.7
45	70.2
46	71.8
47	73.4
48	74.9
49	76.5
50	78.1
51	79.6
52	81.2
53	82.7
54	84.3
55	85.9
56	87.4
57	89.0
58	90.5
59	92.1
60	93.7
61	95.2
62	96.8
63	98.3
64	99.9
65	101.5
66	103.0
67	104.6
68	106.2
69	107.7
70	109.3
71	110.8
72	112.4
73	114.0
74	115.5
75	117.1
76	118.6
77	120.2
78	121.8
79	123.3
80	124.9
81	126.4
82	128.0
83	129.6
84	131.1
85	132.7
86	134.3
87	135.8
88	137.4
89	138.9
90	140.5
91	142.1
92	143.6
93	145.2
94	146.7
95	148.3
96	149.9
97	151.4
98	153.0
99	154.5
100	156.1
101	157.7
102	159.2
103	160.8
104	162.4
105	163.9
106	165.5
107	167.0
108	168.6
109	170.2
110	171.7
111	173.3
112	174.8
113	176.4
114	178.0
115	179.5
116	181.1
117	182.6
118	184.2
119	185.8
120	187.3
121	188.9
122	190.5
123	192.0
124	193.6
125	195.1
126	196.7
127	198.3
128	199.8
129	201.4
130	202.9
131	204.5
132	206.1
133	207.6
134	209.2
135	210.7
136	212.3
137	213.9
138	215.4
139	217.0
140	218.6
141	220.1
142	221.7
143	223.2
144	224.8
145	226.4
146	227.9
147	229.5
148	231.0
149	232.6
150	234.2
151	235.7
152	237.3
153	238.8
154	240.4
155	242.0
156	243.5
157	245.1
158	246.7
159	248.2
160	249.8
161	251.3
162	252.9
163	254.5
164	256.0
165	257.6
166	259.1
167	260.7
168	262.3
169	263.8
170	265.4
171	266.9
172	268.5
173	270.1
174	271.6
175	273.2
176	274.8
177	276.3
178	277.9
179	279.4
180	281.0
181	282.6
182	284.1
183	285.7
184	287.2
185	288.8
186	290.4
187	291.9
188	293.5
189	295.0
190	296.6
191	298.2
192	299.7
193	301.3
194	302.8
195	304.4
196	306.0
197	307.5
198	309.1
199	310.7
200	312.2