Frequency Calculator

Calculate frequency from wavelength and vice versa.

Light: 300,000,000 m/s | Sound: 343 m/s

How to Do It Manually

Frequency is the number of times an event occurs per unit time. Calculate as: count of occurrences ÷ time period.

Frequency = number of occurrences ÷ time period
  1. Count how many times an event happened.
  2. Measure the time span.
  3. Divide count by time (e.g., 50 events in 10 seconds = 5 Hz).

Frequently Asked Questions

What's the difference between frequency and period?

Frequency = cycles per second (Hz). Period = seconds per cycle. They're reciprocals: f = 1/T.

What are common frequencies?

Audio: 20 Hz–20 kHz, AC power: 50–60 Hz, WiFi: 2.4 GHz / 5 GHz.