Frequency to FM Channel Number Converter

How to Use This Calculator

1. Enter the FM radio frequency in MHz in the input field.
2. Click the "Calculate" button to convert the frequency to its corresponding channel number.
3. The calculator will display the channel number and the original frequency.
4. If you enter a frequency outside the standard FM band (88-108 MHz), the calculator will indicate it as invalid.

Working Principle

In North America, FM radio channels are assigned based on their center frequencies. The formula used in this calculator is based on the following relationship:

Channel Number = (Frequency in MHz - 88) × 2

This formula works because the FM band from 88 to 108 MHz spans 20 MHz, and each channel is allocated 200 kHz (0.2 MHz) with 200 kHz guard bands between channels. Therefore, each channel number represents approximately 0.2 MHz above the previous channel.

Example

If you enter 95.5 MHz, the calculator will show channel number 53, because:
(95.5 - 88) × 2 = 7.5 × 2 = 15

Frequency to Channel Number Mapping

Here's a table showing some common FM frequencies and their corresponding channel numbers:

Frequency (MHz)	Channel Number
88.1	0
89.9	10
91.9	20
95.5	53
98.3	70
107.9	155