Prophat.jpg - 1.3 K

Adding Decibels

This calculator requires a JavaScript capable browser

Decibels are logarithmic units and can't be added like other numbers. If you have one source producing a sound level of 65dB and you add a second 65dB sound source, you don't have a level of 130dB, you have a sound level of 68dB. This seems easy enough when both values are the same, but is much less obvious when the levels are different from each other. You will note that when the two levels are similar, the change in the combined level is larger than when the two levels are significantly different.

The level in dB of the first sound source.

The level in dB of the second sound source

The combined level of both sources

JavaScript Help

This information is provided with no warranty of its accuracy, or applicability, and any use made of this information is done so at the sole risk of the user.

Mc Squared System Design Group, Inc Mc Squared System Design Group, Inc

323 - 901 West 3rd Street, North Vancouver, BC. V7P 3P9   Ph 604-986-8181
403 - 1240 Kensington Rd NW, Calgary, AB. T2N 3P7   Ph 403-452-2263
901 King Street West, Suite 400, Toronto, ON. M5V 3H5  Ph 647 - 479 - 9601