Decibels (dB) conversion calculator.
Convert dB, dBm, dBW, dBV, dBmV, dBμV, dBu, dBμA, dBHz, dBSPL, dBA to watts, volts, ampers, hertz, sound pressure.
A decibel (dB) is a unit of measure used to express the ratio of two values of a physical quantity, often power or intensity. It is a logarithmic unit, meaning that it expresses a ratio in terms of the logarithm of the ratio of the two values. The decibel is often used to express the relative difference between two values on a logarithmic scale, which can be useful when the values span a wide range, as is often the case in acoustics and electronics.
Some features of a decibel unit definition tool may include the ability to:
Convert between different units of measure: A decibel unit definition tool may allow you to convert between different units of measure, such as watts and decibels, or volts and decibels.
Calculate the decibel level of a signal: You can use a decibel unit definition tool to calculate the decibel level of a signal, such as the sound level of a speaker or the intensity of a light source.
Compare the relative difference between two values: A decibel unit definition tool can be used to compare the relative difference between two values, such as the difference in volume between two speakers or the difference in intensity between two light sources.
Use different reference levels: Some decibel unit definition tools may allow you to specify a reference level, such as the threshold of human hearing or the intensity of a reference light source, in order to compare values relative to that reference level.
Understand the logarithmic nature of the decibel: A decibel unit definition tool may include explanations or visualizations to help you understand the logarithmic nature of the decibel and how it is used to express ratios between values.
One decibel (0.1 bel) is equal to 10 times the common logarithm of the power ratio. Expressed as a formula, the intensity of sound in decibels is 10 log10 (S1/S2), where S1 and S2 are the intensities of the two sounds; That is, doubling the sound intensity means an increase of slightly more than 3 dB.
It is used because of its ability to express both very large and very small values of power in small numbers; For example, 1 milliwatt = -30 dBW, 1 watt = 0 dBW, 10 watt = 10 dBW, 100 watt = 20 dBW, and 1,000,000 W = 60 dBW.
Decibel is a unit of intensity and Hertz is a unit of frequency, no direct conversion exists between them.
The dB is calculated through two different expressions XdB=10log10(XlinXref) or YdB=20log10(YlinYref). If you convert a quantity X that is related to power or energy, the factor is 10. If you relate a quantity Y to an amplitude, the factor is 20.
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