FFT Resolution Calculator
Calculate the frequency resolution, number of bins, and maximum frequency of a Fast Fourier Transform.
Hz
Typically a power of 2
Frequency Resolution
46.875 Hz
Useful Frequency Bins513
Maximum Frequency24,000 Hz
Time Window Duration21.33 ms
Frequency Resolution vs Sampling Rate
FFT Frequency Resolution
The FFT converts time-domain data into frequency-domain bins. The resolution depends on how long you observe the signal.
Formulas
Frequency Resolution = Sample Rate / FFT Size
Time Window = FFT Size / Sample Rate
Useful Bins = FFT Size / 2 + 1 (for real signals)
Trade-off
Better frequency resolution requires longer observation windows. This is the time-frequency uncertainty principle.Example Calculation
1024-point FFT at 48 kHz sampling rate.
- 01Resolution: 48,000 / 1,024 = 46.875 Hz
- 02Useful bins: 1024/2 + 1 = 513
- 03Max frequency: 48,000 / 2 = 24,000 Hz
- 04Time window: 1024/48,000 x 1000 = 21.33 ms
Frequently Asked Questions
Learn More
Ohm's Law Guide
A complete guide to Ohm's Law. Learn the relationship between voltage, current, and resistance, with practical examples, the power triangle, and circuit analysis tips.