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Home Noise Calculator

Adds decibel levels correctly on a logarithmic scale to give the combined noise from several sources.

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Enter your figures and press Calculate.
In short Home Noise Calculator is a free online tool on inputtesthub.com that adds decibel levels correctly on a logarithmic scale to give the combined noise from several sources. It needs no account, no download and no payment, and there is no daily usage limit. Everything is processed inside your own browser, so the data you paste is never uploaded to a server.

How to use the Home Noise Calculator

  1. Enter your figures in the input fields.
  2. The result updates as you type, together with the full working.
  3. Check the breakdown table to see exactly how the number was reached.

About the Home Noise Calculator

The Home Noise Calculator adds decibel levels correctly on a logarithmic scale to give the combined noise from several sources. It runs as plain JavaScript inside the page, which means there is no upload step, no queue and no size limit imposed by a server — the only limit is your own device.

What people use it for

  • Working out the combined noise of several appliances.
  • Deciding which source is worth silencing.
  • Understanding why a quiet second source changes nothing.

Details

Two equal sources+3 dB
Ten equal sources+10 dB
+10 dBSounds twice as loud
70 dB + 50 dB70.04 dB

The maths behind it

This tool uses Levels are converted to energy, summed, then converted back: total = 10 × log₁₀(Σ 10^(dB/10)). Two equal sources add 3 dB, not double. Every intermediate value is shown on screen, so the result can be checked by hand.

Decibels are logarithmic. The practical consequence is that silencing anything except the loudest source achieves almost nothing — a 70 dB extractor with a 50 dB fridge gives 70.04 dB, and replacing the fridge changes nothing you can hear.

Frequently asked questions

Are there any usage caps on the Home Noise Calculator?
There is no cost and no cap. The Home Noise Calculator is not a demo of a paid product, so nothing is held back or watermarked.
Is the Home Noise Calculator safe to use with private information?
No. The Home Noise Calculator runs entirely in your browser using JavaScript. Because the work happens locally, the tool also keeps working if your connection drops, and closing the tab is all it takes to discard everything.
What formula does the Home Noise Calculator use?
It uses Levels are converted to energy, summed, then converted back: total = 10 × log₁₀(Σ 10^(dB/10)). Two equal sources add 3 dB, not double. The full working is printed under the result, so you can follow every step rather than trusting a black box.
What do people use the Home Noise Calculator for most?
Typical uses: working out the combined noise of several appliances. Deciding which source is worth silencing. Understanding why a quiet second source changes nothing. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
Is there anything to watch out for?
Decibels are logarithmic. The practical consequence is that silencing anything except the loudest source achieves almost nothing — a 70 dB extractor with a 50 dB fridge gives 70.04 dB, and replacing the fridge changes nothing you can hear.
Which values should I know?
Two equal sources is +3 dB. Ten equal sources is +10 dB. +10 dB is Sounds twice as loud. These are printed on the page itself, so you do not have to take them on trust.
Is the number rounded?
The calculation runs in double precision and the result is shown to ten significant figures, so converting a value and converting it back returns the original. What is displayed is rounded for readability; what is copied is not.

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