Power To Ratio Calculator
Convert power values (in watts) to decibel-milliwatts (dBm) or decibel-watts (dBW) and vice versa. Perfect for RF engineers, audio technicians, and electronics enthusiasts.
Published by:
isCalculator Editorial Team
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How to use this tool?
How to Use the Power to Ratio Converter
- Enter a power value in the Power Value field. Use a positive number (e.g., 1, 0.5, 100).
- Select the input unit from the Input Unit dropdown: Watts (W), Milliwatts (mW), dBm, or dBW.
- Select the output unit from the Output Unit dropdown: dBm, dBW, Watts (W), or Milliwatts (mW).
- Click Calculate (or press Enter). The result appears below with the converted value and the formula used.
Tip: Use dBm for power relative to 1 mW, and dBW for power relative to 1 W. All inputs must be positive numbers. The calculator handles conversions between linear (W, mW) and logarithmic (dBm, dBW) scales automatically.
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Frequently Asked Questions
dBm is decibels relative to 1 milliwatt (0 dBm = 1 mW), while dBW is decibels relative to 1 watt (0 dBW = 1 W). They differ by 30 dB: 0 dBm = -30 dBW.
Use the formula: P(dBm) = 10 * log10(P(W)) + 30. For example, 1 W = 10*log10(1)+30 = 30 dBm.
Yes, negative dBm values correspond to powers less than 1 mW. For example, -10 dBm = 0.1 mW.