Pi Attenuator, T Attenuator and bridged T Attenuator Calculator

This online calculator allows you to quickly determine the value of resistors in a Pi attenuator (Fig. 1), T attenuator (Fig. 2) or bridged T attenuator (Fig. 3) circuit. Just enter the desired attenuation (in dB) and impedance (Z) to calculate the needed resistors (R1 and R2) values.

Pi attenuator
Figure 1 		T attenuator
Figure 2 		bridged T attenuator
Figure 3

This tool uses the following equations for Pi attenuator:

K = 10(attenuation / 20)
R1 = Z × ((K + 1) / (K - 1))
R2 = Z / 2 × (K - 1 / K)

This tool uses the following equations for T attenuator:

K = 10(attenuation / 20)
R1 = Z × ((K - 1) / (K + 1))
R2 = Z × (2 × K / (K² - 1))

This tool uses the following equations for bridged T attenuator:

K = 10(attenuation / 20)
R1 = Z × (K - 1)
R2 = Z × (1 / (K - 1))

Learn more about SMD resistor code.


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