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Watts (W) and dBm (decibel milliwatts) are units used to measure power, particularly in the context of electrical signals and radiofrequency (RF) communications.
Watts (W)
Watts are the standard unit of power in the International System of Units (SI). They represent the absolute power level of an electrical signal or device. One watt is equal to one joule of energy transferred per second.
dBm (decibel milliwatts)
dBm is a logarithmic unit used to express power levels in relation to one milliwatt (mW). It is commonly used in RF communications and signal strength measurements.
How to convert watts to dBm
dBm = 10 . log10(P / 0.001)
Watt to dBm conversion table
| Power (W) | Power (dBm) |
| 0 W | not defined |
| 0+ W | -∞ dBm |
| 0.00001 W | -20 dBm |
| 0.0001 W | -10 dBm |
| 0.001 W | 0 dBm |
| 0.01 W | 10 dBm |
| 0.1 W | 20 dBm |
| 1 W | 30 dBm |
| 10 W | 40 dBm |
| 100 W | 50 dBm |
| 1000 W | 60 dBm |
| 10000 W | 70 dBm |
| 100000 W | 80 dBm |
| 1000000 W | 90 dBm |
FAQs on Watts to dBm conversion
How do you convert watts to dBm?
To convert watts (W) to dBm, you can use the formula: dBm = 10 * log10(P / 1 mW), where P is the power in watts. dBm represents power levels in decibels relative to 1 milliwatt (mW).
How many watts is 1 dBm?
1 dBm is equal to approximately 0.001 watts (1 milliwatt). It is a logarithmic unit used to express power levels in decibels referenced to 1 milliwatt.
How do you convert dB to watts?
To convert decibels (dB) to watts, you can use the formula: P (W) = 10^(dB / 10), where P is the power in watts and dB is the decibel value.
What is 200 mW in dBm?
200 mW is equivalent to +23 dBm. To convert from milliwatts to dBm, use the formula in question 1.
How many dBm is 1 mW of power?
1 mW of power is equal to 0 dBm. dBm is a logarithmic scale, and 0 dBm represents 1 milliwatt.
How is dBm calculated?
dBm is calculated by taking the logarithm of the ratio of the power level (in watts) to 1 milliwatt and then multiplying the result by 10. The formula is: dBm = 10 * log10(P / 1 mW), where P is the power in watts.
What does 20 dBm mean?
20 dBm represents a power level of 100 milliwatts (mW). It indicates that the power is 100 times greater than 1 milliwatt, as dBm is a logarithmic scale.
What is dBm strength?
dBm strength is a measure of the power level of a signal or electrical transmission in decibels relative to 1 milliwatt. It provides a convenient way to express signal strength in various communication systems.
How many watts is a dB?
A decibel (dB) is a unitless ratio and does not directly represent a power level. It is used to compare two power levels on a logarithmic scale. To convert dB to watts, you need to know the reference power level. Use the formula: P (W) = 10^(dB / 10), where P is the power in watts and dB is the decibel value relative to the reference power.
