Two Independent Sound Levels Combined Calculator
Two Independent Sound Levels Combined is intended for the specific acoustics task described by its name. Enter sound level a db, sound level b db to calculate a result expressed in dB. The formula works entirely in your browser and needs no account or external API. Sources are assumed independent and measured on the same weighting scale. This estimate is useful for comparing scenarios when the supplied measurements follow the stated assumptions.
How to use this calculator
- Measure sound level a db in the units indicated on the input label.
- Enter Sound level B dB.
- Read the dB result, then compare alternative inputs to evaluate your own situation.
Two Independent Sound Levels Combined formula
10*Math.log10(Math.pow(10,levelA/10)+Math.pow(10,levelB/10)) (dB).
- The expression 10*Math.log10(Math.pow(10,levelA/10)+Math.pow(10,levelB/10)) combines Sound level A dB, Sound level B dB. Follow the units on each input: the answer is expressed in dB.
- Sources are assumed independent and measured on the same weighting scale.
Worked examples
Worked example: Two Independent Sound Levels Combined
Use these sample measurements: Sound level A dB = 60, Sound level B dB = 63.
Compute 10*Math.log10(Math.pow(10,levelA/10)+Math.pow(10,levelB/10)).
Using the example inputs, the result is 64.76435 dB. Use this value to verify the formula before changing the measurements.
Understanding the result
Interpret the output as dB; it is not a measurement taken directly from a physical system.
Sources are assumed independent and measured on the same weighting scale.
Important notes
Sources are assumed independent and measured on the same weighting scale.
Review the input units, any required legal or engineering rules, and unusual edge cases before acting on this estimate.
Frequently asked questions
What does Two Independent Sound Levels Combined calculate?
It evaluates 10*Math.log10(Math.pow(10,levelA/10)+Math.pow(10,levelB/10)) to produce dB from the measurements you enter. For the example values shown, the result is 64.76435 dB.
Which assumptions matter most?
Sources are assumed independent and measured on the same weighting scale.
Can I compare two scenarios?
Yes. Enter another set of measurements in the same units and compare the two outputs.
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This page provides a calculation tool plus explanatory information so you can understand what the result means and when the underlying method may not fit your situation.