Wavelength & Frequency Calculator
By Santaji GadepatilinUpdated October 27, 2026
Hz
100,000,000 Hzcalculated
Type in any field to change it. Press × on a value to calculate that field instead.
How to use this calculator
Choose the type of wave, then enter the frequency (in Hz) or the wavelength. The other is calculated.
The formula
v = f × λ
Worked examples
- FM radio at 100 MHz: λ = 299,792,458 ÷ 100,000,000 = 3.00 m
- Wi-Fi at 2.4 GHz: λ = 12.5 cm
- Sound at 440 Hz in air: λ = 343 ÷ 440 = 78 cm
The electromagnetic spectrum
| Band | Wavelength |
|---|---|
| AM radio | ~200–600 m |
| FM radio | ~3 m |
| Microwaves / Wi-Fi | 1 mm – 30 cm |
| Visible light | 380–750 nm |
| X-rays | 0.01–10 nm |
Tip: for MHz, enter the value × 1,000,000 Hz (100 MHz = 100000000).
Frequently asked questions
How do I convert frequency to wavelength?
Wavelength = wave speed ÷ frequency. For radio, divide 300,000,000 by the frequency in Hz to get metres.
What is the wavelength of 2.4 GHz Wi-Fi?
About 12.5 cm.
What is the wavelength of middle A (440 Hz) in air?
About 78 cm at 20 °C.