Limiter Ceiling Calculator
Calculate the output ceiling to set on a mastering limiter based on your target peak level and desired headroom. Use this to ensure your master clears streaming loudness standards without clipping.
About this calculator
A limiter ceiling (also called the output ceiling or true peak limit) is the maximum level a mastered audio file is allowed to reach. It is calculated by subtracting your desired headroom from your target peak level: ceiling = peakLevel − headroom. Headroom is built-in safety margin that prevents inter-sample peaks (ISPs) from causing distortion during lossy encoding (e.g., MP3 or AAC). Streaming platforms like Spotify and Apple Music recommend a true peak ceiling of −1.0 dBFS to −0.1 dBFS. For example, if your mix peaks at 0 dBFS and you want 1 dB of headroom, your limiter ceiling should be set to −1.0 dBFS. This ensures that even after codec processing, the audio will not clip on playback. The formula is straightforward: ceiling (dBFS) = peakLevel − headroom.
How to use
Your mix measures a peak level of 0 dBFS and you want to leave 1.5 dB of headroom for streaming codec safety. Enter 0 in Peak Level and 1.5 in Headroom. The calculator computes: 0 − 1.5 = −1.5 dBFS. Set your limiter's output ceiling to −1.5 dBFS. If you are targeting vinyl or CD and prefer a hotter master with only 0.3 dB of headroom, enter 0 and 0.3 to get a ceiling of −0.3 dBFS. Always check your final file with a true peak meter to confirm the ceiling is not exceeded after any format conversion.
Frequently asked questions
What limiter ceiling should I use when mastering for Spotify and Apple Music?
Spotify and Apple Music both recommend a true peak maximum of −1.0 dBFS to prevent clipping after lossy encoding. Setting your limiter ceiling to −1.0 dBFS or lower (e.g., −1.5 dBFS) gives the codec enough headroom to encode without generating inter-sample peaks above 0 dBFS. These platforms also apply loudness normalization (typically around −14 LUFS integrated), so an overly loud master will simply be turned down — making aggressive limiting counterproductive. A ceiling of −1.0 dBFS with an integrated loudness of −14 LUFS is a widely accepted starting point for streaming masters.
What is the difference between limiter ceiling and headroom in audio mastering?
The limiter ceiling is the absolute maximum output level the limiter will allow — the hard cap on your master's peak amplitude. Headroom is the safety buffer below 0 dBFS (or below your target peak) that prevents distortion. You set the ceiling by subtracting your desired headroom from your peak reference: ceiling = peakLevel − headroom. For instance, 1 dB of headroom below 0 dBFS gives a −1 dBFS ceiling. Headroom is especially important for digital distribution because lossy codecs can create inter-sample peaks that exceed the ceiling if no margin is left.
Why do inter-sample peaks cause clipping even when my limiter ceiling is set below 0 dBFS?
Digital audio consists of discrete sample values, but when a DAC reconstructs the continuous waveform it interpolates between those samples. The reconstructed analog waveform can peak higher than any individual sample value — these are called inter-sample peaks (ISPs). Even if every sample in your file is at or below −1 dBFS, the reconstructed waveform may momentarily exceed 0 dBFS. Lossy codecs like MP3 and AAC also alter sample values during compression, potentially creating new peaks. Setting a true peak ceiling of −1.0 dBFS or lower with a true-peak-aware limiter guards against both of these scenarios.