Acoustics
Planning calculators for acoustics — estimates from industry-style inputs.
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STC Rating Calculator
Estimate Sound Transmission Class (STC) for wall assemblies based on wall type, drywall layers, insulation, stud spacing, resilient channel, and staggered studs.
IIC Rating Calculator
Estimate the Impact Insulation Class (IIC) rating of a floor-ceiling assembly based on floor type, underlayment, finish, and ceiling treatment.
Soundproofing Material Calculator
Calculate sound transmission loss using the mass law (TL = 20×log10(f×m) - 47 dB). Supports single and multi-layer assemblies with air gaps.
Room Mode Calculator
Calculate reverberation time (RT60) using the Sabine and Eyring equations. Input room dimensions and surface materials to get RT60, total absorption, and comparison to optimal values.
Noise Reduction Coefficient Calculator
Analyze sound flanking transmission paths. Input the STC of the direct path and each flanking path (walls, floor, ceiling) to find the apparent STC and weakest link.
Sound Masking Calculator
Calculate OSHA noise dose and time-weighted average (TWA) from multiple exposure periods. Determines compliance with OSHA PEL (90 dBA / 8 hr) using the 5 dB exchange rate.
Outdoor Noise Barrier Calculator
Calculate sound barrier insertion loss using the Maekawa method with Fresnel number analysis for outdoor noise barriers.
HVAC Noise Calculator
Estimate HVAC duct noise levels in a room from fan data, duct geometry, and fittings. Calculates sound power, duct attenuation, breakout noise, and NC rating.
Concert Hall Acoustics Calculator
Design a Schroeder QRD (Quadratic Residue Diffuser) panel by computing well depths, panel width, and effective diffusion bandwidth from design frequency and prime number.
Isolation Room Design Calculator
Calculate outdoor sound propagation from a noise source to a receiver. Models geometric spreading, ground effects, and atmospheric absorption (ISO 9613).