// Calculators › Signal & Power

Noise Figure Calculator

Calculate cascaded noise figure and gain for a multi-stage RF chain using Friis's formula. Add up to 8 stages — amplifiers, mixers, attenuators, filters.

// RF Chain Stages

Stage NameNF (dB)Gain (dB)

⚠ Please check your inputs — NF and Gain must be valid numbers.

// Results

📡

Add stages and click Calculate

Cascaded NF —dB

Total Gain —dB

Noise Temperature —K

Stage Breakdown

Friis's Formula
F_total = F₁ + (F₂−1)/G₁ + (F₃−1)/(G₁·G₂) + …
NF = 10·log₁₀(F_total)
T_e = T₀·(F_total − 1) [T₀ = 290 K]