Wavelength ↔ Frequency Calculator
Frequency and wavelength describe the same radio signal in different ways. This calculator converts between frequency (MHz) and wavelength (meters) using the standard speed-of-light approximation commonly used throughout amateur radio. The calculator works in either direction — enter either a frequency or a wavelength and the corresponding value will be calculated automatically.
The constant 300 represents the approximate speed of light (300 million meters per second) and provides sufficiently accurate results for amateur radio antenna planning.
| Band | Frequency (MHz) | Approx. Wavelength |
|---|---|---|
| 160 m | 1.8 | 166.7 m |
| 80 m | 3.5 | 85.7 m |
| 60 m | 5.3 | 56.6 m |
| 40 m | 7.1 | 42.3 m |
| 30 m | 10.1 | 29.7 m |
| 20 m | 14.2 | 21.1 m |
| 17 m | 18.1 | 16.6 m |
| 15 m | 21.2 | 14.2 m |
| 12 m | 24.9 | 12.0 m |
| 10 m | 28.4 | 10.6 m |
| 6 m | 50.1 | 6.0 m |
| 2 m | 146 | 2.05 m |
| 70 cm | 446 | 0.67 m |
- Estimating antenna element lengths
- Understanding amateur radio band names
- Designing portable antennas
- Planning field deployments
- Studying propagation
- RF education
- SOTA and POTA antenna construction
- Emergency communications planning
Amateur radio bands are traditionally identified by their approximate wavelength rather than their operating frequency. For example, the 20-meter band operates near 14 MHz, while the 2-meter band operates near 146 MHz. This calculator helps illustrate the mathematical relationship between those two ways of describing the same radio signal.