Decibel Calculator
Add levels, calculate energetic averages and correct for background noise.
Tool directory
Acoustic calculators and analysis tools
Practical, transparent calculations for everyday acoustics and signal-processing work.
Sound Levels
Available
Sound Pressure & Sound Power
Convert physical quantities and estimate free-field sound levels.
Distance Attenuation
Calculate level changes between two distances for point or line sources.
Signal Processing
FFT Calculator
Load WAV audio or generate a signal and inspect its windowed amplitude spectrum.
Sampling Calculator
Relate sample rate, record length, Nyquist frequency, resolution and aliasing.
Frequency / Period Converter
Convert frequency, period, angular frequency and acoustic wavelength.
Rotating Machinery
Blade Passing Frequency Calculator
Calculate BPF and harmonics from rotational speed and blade count.
RPM / Hz Converter
Convert rotational speed between revolutions per minute and hertz.
Tip Speed Calculator
Calculate circumferential speed from diameter and rotational speed.
Propagation
Outdoor Sound Propagation
Model third-octave propagation with atmosphere, ground and Maekawa barriers.
Atmospheric Absorption
Analyse ISO 9613-1 air absorption across frequency, distance and climate.
Doppler Shift
Calculate, visualize and hear the frequency shift from moving sources and receivers.
Psychoacoustics
Sound Quality Metrics
Analyze calibrated WAV files for loudness, sharpness, roughness and tonality.
Understanding Sound Quality Metrics
Listen to controlled comparisons of roughness, sharpness and tonality.
Create Sounds
Tone & Noise Generator
Create pressure-calibrated waveforms and coloured noise, preview them and download 32-bit-float WAV files.
Advanced Sound Generator
Apply configurable amplitude modulation to tones or noise and inspect the resulting signal and envelope.