# RL cutoff frequency calculation

Calculators and formulas for calculating the cutoff frequency of a coil and a resistor

## RL cutoff frequency calculator

This function can be used to calculate the cut-off frequency of a coil and a resistor, or the inductance or the resistance. Two of the values ​​must be known in order to calculate the third.

### Cutoff frequency calculator

 What should be calculated? Resistance Inductance Cutoff frequency Input Inductance H mH µH nH Cutoff frequency Hz kHz MHz GHz Resistance mΩ Ω kΩ MΩ Decimal places 0 1 2 3 4 6 8 10 Results Inductance Cutoff frequency Resistance

## Formulas for the RL cutoff frequency

$$\displaystyle R$$ Resistance

$$\displaystyle L$$ Induktivität

$$\displaystyle f$$ Grenzfrequenz

## Formula for calculating the resistance

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

$$\displaystyle R=2 · π · f · L$$

## Formula for calculating the inductance

The inductance is calculated using the following formula. The frequency $$\displaystyle f$$ and the resistance $$\displaystyle R$$ must be known.

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

## Formula for calculating the cutoff frequency

The frequency is calculated using the following formula. The resistance $$\displaystyle R$$ and the inductance $$\displaystyle L$$ must be known.

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