Cutoff Frequency Calculator

Find the cutoff frequency of an RC filter.

Cutoff frequency (Hz) 159.15

Formula: fc = 1 ÷ (2π·R·C)

Step-by-step with your numbers:

1. Values used:

2. Resistance = 1,000 Ω

3. Capacitance = 1 µF

5. Cutoff frequency = 159.15Hz

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The cutoff (corner) frequency is where an RC filter's output drops to −3 dB.

The math behind it

fc = 1 ÷ (2π·R·C). Below/above it, the filter passes or attenuates depending on type.

1 kΩ, 1 µF → about 159 Hz.

What is −3 dB?

Half the power point, where the output amplitude is 1/√2 of the input.