# Calculate the RC cutoff frequency

Calculation of the cut-off frequency of a capacitor-resistor circuit

## RC cutoff frequency calculator

This function can be used to calculate the cutoff frequency of a capacitor and a resistor, or the capacitance or resistance at a given frequency. Two of the values ​​must be known in order to calculate the third.

Calculate cutoff frequency

 What should be calculated? Resistor Capacitor Cutoff frequency Input Capacitor F mF µF nF pF Cutoff frequency Hz kHz MHz GHz Resistor mΩ Ω kΩ MΩ Decimal places 0 1 2 3 4 6 8 10 Result Capacitor Cutoff frequency Resistor

## Formulas for calculating the cutoff frequency

The frequency is calculated according to the following formula. The resistance $$\displaystyle R$$ and the capacity $$\displaystyle C$$ must be known.

$$\displaystyle f=\frac{1}{2 ·\ π · R · C }$$

### Formula for calculating the resistance

The resistance can be calculated using the following formula. The frequency $$\displaystyle f$$ and the capacity $$\displaystyle C$$ must be known.

$$\displaystyle R=\frac{1}{2 ·\ π · f · C }$$

### Formula for calculating the capacity

The capacity is calculated according to the following formula. The frequency $$\displaystyle f$$ and the resistance $$\displaystyle R$$ must be known.

$$\displaystyle C=\frac{1}{2 ·\ π · f · R }$$

#### Related functions:

Calculate RC series connection, calculates the voltages, powers, current and reactance at a given frequency at a given frequency.

RC low pass calculation calculates the output voltage, attenuation and phase rotation for the given frequency

RC high pass calculate calculates the output voltage, attenuation and phase shift for the given frequency

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