How to use the beat frequency calculator
Find the beat frequency of two close tones. Enter frequency 1, frequency 2 in the fields above; the beat frequency, beat period are computed instantly and plotted on the chart so you can see how the answer changes.
Formula
Variables
- f1 — Frequency 1 (Hz)
- f2 — Frequency 2 (Hz)
Worked example
With frequency 1 = 440 Hz, frequency 2 = 443 Hz, the calculator gives beat frequency ≈ 3 Hz; beat period ≈ 0.3333333 s.
Frequently asked questions
What is the formula for the beat frequency calculation?
Beat frequency (Hz) = abs(f1-f2). Beat period (s) = 1 / [Beat frequency]. Here f1 is frequency 1 (Hz), f2 is frequency 2 (Hz).
What inputs do I need for the beat frequency calculator?
You need frequency 1 in Hz, frequency 2 in Hz. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use this calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.