Insertion Loss Calculator

Find insertion loss from input and output power.

Insertion loss (dB) 0.9691

Formula: IL = 10·log₁₀(P_in ÷ P_out)

Step-by-step with your numbers:

1. Values used:

2. Input power = 1 W

3. Output power = 0.8 W

5. Insertion loss = 0.9691dB

Did we solve your problem today?

Insertion loss is the signal power lost when a component is inserted into a line.

The math behind it

IL(dB) = 10·log₁₀(P_in ÷ P_out). Lower is better; a perfect component has 0 dB.

1 W in, 0.8 W out → about 0.97 dB.

Insertion loss vs return loss?

Insertion loss is power not passed through; return loss is power reflected back.