This tool converts from **Watt to dB **as a measure of Sound or Noise Level.

Enter the power level in Watt.

**Formula**

Sound power levels or **L _{wdB}** are determined by the following formula:

**L _{wdB} = 10*Log_{10} (L_{w}/ L_{R})**

where

- The reference power
**L**is one trillionth of a Watt or 10_{R}^{-12}W **L**is the power specified in Watt_{W}

**Example Calculation**

The Saturn V rocket has a Sound Power level of **100,000,000** **Watt**. This is equivalent to **200 dB** (dangerously high levels!).

A quiet conversation (at the opposite end of the audio scale) has a level of **10 ^{−9} W = 0.000000001 Watt**. This is equivalent to

**30 dB**.

**Background**

Sound Power Level (abbreviated as **SWL**) is the rate at which sound energy is emitted, reflected, transmitted or received. It does not depend on distance from the source.

Contrast this with Sound Pressure Level (SPL) which has a distance associated with it and usually specified in audio systems like speakers, sub woofers and amplifiers.

Even though they are different, the above calculator can be used to convert from Watt to dB.