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 between level quantities under defined acoustic conditions.
Distance Attenuation
Estimate free-field level changes with distance.
Signal Processing
FFT Calculator
Inspect frequency content from time-domain measurement data.
Sampling Calculator
Relate sample rate, record length, Nyquist frequency and resolution.
Frequency / Period Converter
Convert frequency to period and period to frequency.
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
Geometric Spreading
Estimate divergence loss for point and line sources.
Atmospheric Absorption
Estimate frequency-dependent attenuation in air.
Doppler Shift
Calculate observed frequency for moving sources and receivers.
Psychoacoustics
Loudness
Estimate perceived magnitude using standardized methods.
Tonality
Assess prominent tonal components in noise.
Roughness
Explore perception caused by rapid amplitude modulation.