4 free acoustics calculators and tools. Solve real-world acoustics problems instantly with accurate, step-by-step results on ApexCalc.
| Constant | Symbol | Value |
|---|---|---|
| Speed of light | c | 2.99792458×10⁸ |
| Planck's constant | h | 6.62607015×10⁻³‴ |
| Boltzmann constant | kʙ | 1.380649×10⁻²³ |
| Avogadro's number | Nₐ | 6.02214076×10²³ |
| Gravitational constant | G | 6.6743×10⁻¹¹ |
| Gas constant | R | 8.31446 |
| Elementary charge | e | 1.602176634×10⁻¹⁹ |
| Electron mass | mₑ | 9.1093837015×10⁻³¹ |
| Proton mass | mₚ | 1.67262192369×10⁻²⁷ |
| Fine-structure constant | α | 7.2973525693×10⁻³ |
Calculate sound pressure level in decibels from pressure, combine multiple noise sources, and calculate A-weighted SPL for occupational exposure.
Calculate NRC, sound transmission class (STC), and insertion loss for barriers and partition walls.
Calculate natural frequency, resonant frequency, and damping ratio for mechanical and acoustic systems from mass-spring-damper parameters.
Calculate reverberation time (RT60) using the Sabine and Eyring formulas. Design acoustic treatment for studios, concert halls, and offices.