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
11.6
23.1
34.7
46.2
57.8
69.4
710.9
812.5
914.0
1015.6
1117.2
1218.7
1320.3
1421.9
1523.4
1625.0
1726.5
1828.1
1929.7
2031.2
2132.8
2234.3
2335.9
2437.5
2539.0
2640.6
2742.1
2843.7
2945.3
3046.8
3148.4
3250.0
3351.5
3453.1
3554.6
3656.2
3757.8
3859.3
3960.9
4062.4
4164.0
4265.6
4367.1
4468.7
4570.2
4671.8
4773.4
4874.9
4976.5
5078.1
5179.6
5281.2
5382.7
5484.3
5585.9
5687.4
5789.0
5890.5
5992.1
6093.7
6195.2
6296.8
6398.3
6499.9
65101.5
66103.0
67104.6
68106.2
69107.7
70109.3
71110.8
72112.4
73114.0
74115.5
75117.1
76118.6
77120.2
78121.8
79123.3
80124.9
81126.4
82128.0
83129.6
84131.1
85132.7
86134.3
87135.8
88137.4
89138.9
90140.5
91142.1
92143.6
93145.2
94146.7
95148.3
96149.9
97151.4
98153.0
99154.5
100156.1
101157.7
102159.2
103160.8
104162.4
105163.9
106165.5
107167.0
108168.6
109170.2
110171.7
111173.3
112174.8
113176.4
114178.0
115179.5
116181.1
117182.6
118184.2
119185.8
120187.3
121188.9
122190.5
123192.0
124193.6
125195.1
126196.7
127198.3
128199.8
129201.4
130202.9
131204.5
132206.1
133207.6
134209.2
135210.7
136212.3
137213.9
138215.4
139217.0
140218.6
141220.1
142221.7
143223.2
144224.8
145226.4
146227.9
147229.5
148231.0
149232.6
150234.2
151235.7
152237.3
153238.8
154240.4
155242.0
156243.5
157245.1
158246.7
159248.2
160249.8
161251.3
162252.9
163254.5
164256.0
165257.6
166259.1
167260.7
168262.3
169263.8
170265.4
171266.9
172268.5
173270.1
174271.6
175273.2
176274.8
177276.3
178277.9
179279.4
180281.0
181282.6
182284.1
183285.7
184287.2
185288.8
186290.4
187291.9
188293.5
189295.0
190296.6
191298.2
192299.7
193301.3
194302.8
195304.4
196306.0
197307.5
198309.1
199310.7
200312.2