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Free for Engineers
Quick, standards-based calculators for the everyday acoustics questions — noise dose, attenuation, sound isolation. Run a screening estimate, then bring us the ones that cross a compliance line. Each tool is reviewed by our board-certified engineers and cites the governing standard.
Enter measured levels and exposure times to check worker noise dose and TWA against the OSHA action level and PEL. NIOSH mode included.
Predict how a source level drops with distance — point and line sources, the 6-dB-per-doubling rule, and an excess-attenuation option.
Combine sound levels correctly — because 10 dB plus 10 dB is 13 dB, not 20. Add and subtract sources with a worked breakdown.
Look up sound-isolation (STC) and absorption (NRC) values for common assemblies, and estimate the composite STC of a wall with a door or window.
Estimate a room's reverberation from its dimensions and surface materials using the Sabine equation, with target ranges by use.
Compute day-night average sound level with the nighttime penalty, and compare against typical ordinance and HUD land-use thresholds.
These calculators size a problem in seconds. When a result crosses a compliance line — an OSHA obligation, a property-line limit, a code target, a courtroom date — a board-certified CSTI engineer turns the estimate into a stamped, defensible assessment.