Decibels, Loudness & Dynamics
Online decibel meter, LUFS loudness meter, SPL calculator, loudness normalization for Spotify/YouTube/broadcast, dynamic range meter, compression visualizer, signal-to-noise ratio calculator, gain calculator, and compressor estimator — for audio engineers, podcasters, music producers, and content creators.
Available Tools
Decibel (dB) Meter
Live microphone sound-level meter with a big dBFS readout, peak hold, fast/slow response, running average (Leq) and clip detection. Honest about limits — it reads relative dBFS, not calibrated dB SPL, with an optional manual offset. Nothing recorded.
Launch tool →Sound Pressure Level (SPL) Calculator
Convert sound pressure (pascals) ↔ dB SPL re 20 µPa, apply the inverse-square law over distance (−6 dB per doubling), and combine uncorrelated sources in decibels. Common-level reference chart included. Textbook formulas — a calculator, not a measurement.
Launch tool →RMS Calculator
Convert between peak, RMS, peak-to-peak and average for sine, square, triangle and sawtooth waveforms (with crest factor), or compute the RMS, mean and peak of a list of values you paste in. Standard formulas — a calculator, not a measurement.
Launch tool →Peak Amplitude / Level Analyzer
See live sample peak and RMS level side by side in dBFS, the crest factor between them, and your headroom to 0 dBFS — with peak hold and clip detection. Relative dBFS, not calibrated SPL. Nothing recorded.
Launch tool →Loudness Normalization Tool
Enter your measured loudness and a target — presets for Spotify/YouTube (−14), Apple Music (−16), broadcast (−23/−24 LUFS) — to get the exact gain to apply, plus a true-peak ceiling check. A calculator: enter the LUFS you measured, it computes the gain.
Launch tool →LUFS Meter (Loudness Meter)
K-weighted momentary (400 ms), short-term (3 s) and integrated loudness from your mic, with max-momentary tracking. Honest about limits — approximate and relative, mono and uncalibrated, not a certified BS.1770/R128 file measurement.
Launch tool →Signal-to-Noise Ratio Calculator
Compute SNR in dB from two levels, from an amplitude (20·log) or power (10·log) ratio, and convert between SNR and effective number of bits (ENOB), with an ideal SNR-by-bit-depth reference. A calculator — enter your values.
Launch tool →Gain Calculator
Convert between decibels and a linear multiplier (amplitude 20·log or power 10·log), and cascade a chain of gain stages to find the total gain and output level with a 0 dBFS clipping check. A calculator — enter your values.
Launch tool →Audio Dynamic Range Meter
Watch the live spread between the loudest and quietest passages your mic captures, in dB, with a noise gate and range bar. Relative dBFS — the captured level spread (incl. room noise), not a mastering DR/DR14 rating.
Launch tool →Dynamic Range Compression Visualizer
Set threshold, ratio, knee and makeup gain and watch the compressor transfer curve (input vs output) redraw, with the output level and gain reduction at any input. Shows the static level mapping — not attack/release timing, and it doesn’t process audio.
Launch tool →Compression Frequency Analyzer
See the live level and dynamic range (loudest−quietest) of each octave band from your mic, revealing which frequencies are most and least dynamic. Relative dBFS, single-source view — not a before/after file comparison.
Launch tool →Audio Frequency Balancer
See how your sound’s energy spreads across sub, bass, mid, treble and air, time-averaged, and how each band deviates from a neutral (equal-energy-per-octave) balance — with ratings and gentle EQ hints. Relative, not calibrated.
Launch tool →Loudness Frequency Analyzer
See each octave band’s level under A-, C- or Z-weighting, revealing which frequencies your ear hears loudest, with a Fletcher–Munson / equal-loudness explanation. Relative dBFS, not calibrated dBA/dBC.
Launch tool →Loudness Compensation Calculator
Enter your reference and (quieter) listening level to get an approximate bass/treble EQ boost that restores balance at low volume — the idea behind a hi-fi "loudness" control. A simplified, shape-correct equal-loudness model, not precise ISO 226 — set by ear.
Launch tool →Audio Compressor Estimator
Pick a source (vocals, drums, bass, mix bus, podcast) and get sensible starting-point compressor settings — ratio, threshold, attack, release, knee, makeup — with a transfer-curve preview and why-it-works notes. Starting points, not rules.
Launch tool →Audio Frequency Fatigue Calculator
Enter a level in dBA to get the maximum safe listening time per NIOSH and OSHA, with a risk rating and reference chart, plus why the 2–5 kHz range drives listening fatigue and how to protect your hearing.
Launch tool →