Measure the sound level L2 in dB or dBA at the distance d2 from the source. Use case: Measure sound at a distant point and calculate the sound level close to the source Common good values are 1.5meter or 2meter for d1. You want to know what the sound level at distance d2 would be.Įxample: L1=80dBA at d1=1.5m, What is the sound level at d2=4.5m?Įnter the values 80 (L1), 1.5 (d1) and 4.5 (d2) into the calculatorĭo not get too close to the source when you measure L1 but be close enough such that background noise is neglectable. Measure the sound level L1 in dB or dBA at the distance d1 from the source. Use case: Measure close to the source and calculate the sound level in the distance L = sound level in db or dBA, d = distance in m (meter) or ft (feet). The sound level drops by 6dB when you double the distance to the sound source.ġ0 times the distance drops the sound level by 20dB.Įnter 3 values and the calculator will calculate the 4th value for you. Is not confined by walls or other large objects. It can be applied in situations where the sound can propagate freely and This calculator uses the Inverse Square Law which allows you to estimate the sound reduction over distance. Sound drop over distance, dB over distance Just extend the formula to add/subtract more values. Measure 3 sound sources separately at the same location (same distance)Īnd then calculate what the resulting dB value would be if This means the sound source produces 78.3dBA at the point The background noiseĮnter in the calculator 80-75 and press calculate. Now turn the sound source off and measure in the same location Measure the sound level in dB or dBA with the sound source running and background noise present. This page has a number of different calculators for sound and decibels.
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