Gain Staging Calculator — Signal Chain Optimisation

Signal Level

Level at each stage = Input Level + Sum of all gain stages up to that point

dB gains add linearly along a series signal path (the cascaded-gain rule), so the running level after each stage is simply the input plus every gain applied so far.

Signal-to-Noise Ratio

SNR = (Input Signal Level + Preamp Gain) − Noise Floor

The System Noise Floor is the fixed converter/interface self-noise, which sits after the analogue preamp. Because that floor is fixed, turning the preamp up lifts the captured signal above it and directly improves the signal-to-noise ratio — the preamp gain is what sets your SNR. Plugins and the fader come after conversion (in the digital domain), so they raise the captured signal and the already-captured noise by the same amount and cannot change the ratio. That is why setting a healthy preamp level matters far more than boosting a quiet signal later.

Headroom

Headroom = Clip Ceiling − Output Level (Clip Ceiling defaults to 0 dBFS)

Gain to Target

Gain to Target = Target Peak Level − Output Level

A positive value means you can add this much gain to reach your target peak; a negative value means you should reduce gain by that amount.