A selection of free web-based applications to assist you with your noise assessments, calculations and reporting. These applications run in your browser, so there is no installation necessary.
Addition and subtraction of decibels, with an explanation of how dB addition works.
Calculates both the Ldn (day-night) and Lden (day-evening-night) from hourly Leq.
Calculates a worker's Time Weighted Average - TWA - noise exposure using the time spent and the sound level at each location.
Calculates the sound level at the ear when wearing hearing protectors. The calculator uses the NRR, SNR, HML or Octave Band method.