Sound Level and Noise Exposure Calculators

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.

Decibel, dB and Sound Level Calculators

Decibel Calculator

Addition and subtraction of decibels, with an explanation of how dB addition works.

Ldn and Lden Calculator

Calculates both the Ldn (day-night) and Lden (day-evening-night) from hourly Leq.

Occupational Noise - TWA and Dose Calculator

These acoustic calculators are designed to help with your noise assessments in line with the OSHA Occupational Noise Regulations and other occupational noise standards. TWA, Dose % and Hearing Protector Calculators.

Time Weighted Average and Dose Calculator

Calculates a worker's Time Weighted Average TWA and % Dose noise exposure using the time spent and the sound level at each location.

Hearing Protector Calculator

Calculates the sound level at the ear when wearing hearing protectors. The calculator uses the NRR, SNR, HML or Octave Band method.