Sound & Acoustics Calculators
Calculate decibel levels, sound wavelengths, room acoustics, reverb times and noise reduction values.
Decibel Calculator
Add, subtract and compare decibel levels with this free calculator. Combine multiple sound sources and calculate dB change with distance.
Sound Wavelength Calculator
Calculate the wavelength of any sound wave from its frequency and air temperature. Essential tool for acoustics and speaker placement.
Room Acoustics Calculator
Estimate room modes, resonant frequencies and key acoustic properties from room dimensions. Free online room acoustics calculator.
Reverb Time Calculator
Calculate RT60 reverberation time using the Sabine and Eyring equations. An essential tool for studio and live room acoustic design.
Absorption Coefficient Calculator
Calculate total sound absorption and average absorption coefficient for any room. Plan your acoustic treatment for studios and venues.
Sound Pressure Level Calculator
Convert between sound pressure in pascals and sound pressure level (SPL) in decibels. Essential everyday reference for audio engineers.
Frequency Calculator
Convert between frequency, wavelength and period for any sound wave. A useful tool for acoustics, audio engineering and speaker design.
Standing Wave Calculator
Find standing wave frequencies and room modes for rectangular rooms. Identify problematic resonances for acoustic treatment planning.
Diffusion Calculator
Calculate sound diffuser well depths and dimensions for target frequencies using QRD and PRD designs. Free acoustic diffusion tool.
Noise Reduction Calculator
Calculate noise reduction between adjacent rooms based on wall construction, transmission loss and absorption. Free online calculator.
10 free calculators in Sound & Acoustics
Understanding Sound and Acoustics
Sound is a mechanical wave that propagates through air (and other media) as variations in pressure. Understanding the physics of sound is essential for anyone working in audio — whether you are designing a recording studio, tuning a live venue, or simply trying to reduce noise between rooms.
The decibel (dB) is the fundamental unit of measurement in audio. It is a logarithmic ratio, which means that combining two identical sound sources adds approximately 3 dB, not double the value. Our decibel calculator handles the maths of combining, subtracting and comparing sound levels correctly.
Room acoustics are governed by the dimensions of the space. Every room has resonant frequencies (modes) determined by its length, width and height. These modes can cause uneven bass response if the room dimensions are poorly proportioned. The standing wave and room acoustics calculators help identify problematic frequencies so you can plan acoustic treatment effectively.
Reverberation time (RT60) measures how long it takes for sound to decay by 60 dB after the source stops. The Sabine equation is the standard formula for calculating RT60, while the Eyring equation provides more accurate results for rooms with higher absorption. Both are available in our reverb time calculator.