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Converts between power ratios and decibel scale for audio, RF, and other applications. Logarithmic scale matches human perception.
सूत्र
dBm = 10 × log10(P ÷ 0.001)
- P
- P value — Variable used in the calculation
चरण-दर-चरण मार्गदर्शिका
- 1dBm = 10 × log10(P ÷ 0.001)
- 2dBW = 10 × log10(P)
- 3Reverse: power (watts) = 10^(dBm ÷ 10) ÷ 1000
- 4Every 3 dB ≈ 2× power
- 5Every 10 dB ≈ 10× power
हल किए गए उदाहरण
इनपुट
Power 1W
परिणाम
30 dBm
सामान्य गलतियां जिनसे बचना है
- ✕Confusing dBm (power) with dBV (voltage) with dBu (relative to 0.775V)
- ✕Adding dBm values instead of multiplying power
अक्सर पूछे जाने वाले प्रश्न
Why use decibels instead of watts?
Logarithmic scale compresses large ranges (1W to 1MW becomes 30 dBm to 60 dBm), easier comparison.
What's typical dBm for audio and RF?
Audio -20 to +4 dBu typical; WiFi transmit +17 to +30 dBm; cellular -30 to +33 dBm.
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