dBdB 与倍数与倍数换算速查表速查表计算公式： dB = 10log （P1/P2）P1/P2：是功率的倍数示例：P1 为 2W，P2 为 1W10log （2W/1W）=10 log（2）=3dB即 3dB 代表 2 倍此外，当有 dBm 减 dBm 时，得到的结果为 dB, 如：15dBm-9dBm=6dBdBdB 与倍数换算速查表（功率）与倍数换算速查表（功率）dBdB倍数倍数dBdB倍数倍数dBdB倍数倍数0116.141 19.182 3216.242 19.283 4.8316.343 19.284 6416.444 19.385 7516.545 19.386 7.8616.646 19.487 8.5716.747 19.488 9816.848 19.589 9.5916.949 19.590 10101750 19.691 10.41117.151 19.692 10.81217.252 19.793 11.11317.253 19.794 11.51417.354 19.895 11.81517.455 19.896 121617.556 19.997 12.31717.657 19.998 12.61817.658 2099 12.81917.759 20100 132017.860 23200 13.22117.961 24.8300 13.42217.962 26400 13.6231863 27500 13.82418.164 27.8600 142518.165 28.5700 14.126 18.266 2980014.32718.367 29.5900 14.52818.368 301000 14.62918.469 332000 14.83018.570 34.83000 14.93118.571 364000 15.13218.672 375000 15.23318.673 37.86000 15.33418.774 38.57000 15.43518.875 398000 15.63618.876 39.59000 15.73718.977 4010000 15.83818.978 50100000 15.9391979 16401980 。