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技術情報 RF技術ライブラリー Technical Information
dBm-Watt変換表

高周波回路設計などでは電力の表現に"dBm"や"watts"をよく使います。dBmとはmW基準の絶対値表現で、0dBm=1mWです。変換式はdBm=10log10(mW)です。いくつかの値は覚えておくと便利です。例えば、0dBm=1mW,10dBm=10mW,20dBm=100mW,30dBm=1W,40dBm=10Wですね。

dBmmWdBmmWdBmmWdBmW
0.01.0010.010.020.010030.01.00
0.11.0210.110.220.110230.11.02
0.21.0510.210.520.210530.21.05
0.31.0710.310.720.310730.31.07
0.41.1010.411.020.411030.41.10
0.51.1210.511.220.511230.51.12
0.61.1510.611.520.611530.61.15
0.71.1710.711.720.711730.71.17
0.81.2010.812.020.812030.81.20
0.91.2310.912.320.912330.91.23
1.01.2611.012.621.012631.01.26
1.11.2911.112.921.112931.11.29
1.21.3211.213.221.213231.21.32
1.31.3511.313.521.313531.31.35
1.41.3811.413.821.413831.41.38
1.51.4111.514.121.514131.51.41
1.61.4511.614.521.614531.61.45
1.71.4811.714.821.714831.71.48
1.81.5111.815.121.815131.81.51
1.91.5511.915.521.915531.91.55
2.01.5812.015.822.015832.01.58
2.11.6212.116.222.116232.11.62
2.21.6612.216.622.216632.21.66
2.31.7012.317.022.317032.31.70
2.41.7412.417.422.417432.41.74
2.51.7812.517.822.517832.51.78
2.61.8212.618.222.618232.61.82
2.71.8612.718.622.718632.71.86
2.81.9112.819.122.819132.81.91
2.91.9512.919.522.919532.91.95
3.02.0013.020.023.020033.02.00
3.12.0413.120.423.120433.12.04
3.22.0913.220.923.220933.22.09
3.32.1413.321.423.321433.32.14
3.42.1913.421.923.421933.42.19
3.52.2413.522.423.522433.52.24
3.62.2913.622.923.622933.62.29
3.72.3413.723.423.723433.72.34
3.82.4013.824.023.824033.82.40
3.92.4513.924.523.924533.92.45
4.02.5114.025.124.025134.02.51
4.12.5714.125.724.125734.12.57
4.22.6314.226.324.226334.22.63
4.32.6914.326.924.326934.32.69
4.42.7514.427.524.427534.42.75
4.52.8214.528.224.528234.52.82
4.62.8814.628.824.628834.62.88
4.72.9514.729.524.729534.72.95
4.83.0214.830.224.830234.83.02
4.93.0914.930.924.930934.93.09
dBmmWdBmmWdBmmWdBmW
5.03.1615.031.625.031635.03.16
5.13.2415.132.425.132435.13.24
5.23.3115.233.125.233135.23.31
5.33.3915.333.925.333935.33.39
5.43.4715.434.725.434735.43.47
5.53.5515.535.525.535535.53.55
5.63.6315.636.325.636335.63.63
5.73.7215.737.225.737235.73.72
5.83.8015.838.025.838035.83.80
5.93.8915.938.925.938935.93.89
6.03.9816.039.826.039836.03.98
6.14.0716.140.726.140736.14.07
6.24.1716.241.726.241736.24.17
6.34.2716.342.726.342736.34.27
6.44.3716.443.726.443736.44.37
6.54.4716.544.726.544736.54.47
6.64.5716.645.726.645736.64.57
6.74.6816.746.826.746836.74.68
6.84.7916.847.926.847936.84.79
6.94.9016.949.026.949036.94.90
7.05.0117.050.127.050137.05.01
7.15.1317.151.327.151337.15.13
7.25.2517.252.527.252537.25.25
7.35.3717.353.727.353737.35.37
7.45.5017.455.027.455037.45.50
7.55.6217.556.227.556237.55.62
7.65.7517.657.527.657537.65.75
7.75.8917.758.927.758937.75.89
7.86.0317.860.327.860337.86.03
7.96.1717.961.727.961737.96.17
8.06.3118.063.128.063138.06.31
8.16.4618.164.628.164638.16.46
8.26.6118.266.128.266138.26.61
8.36.7618.367.628.367638.36.76
8.46.9218.469.228.469238.46.92
8.57.0818.570.828.570838.57.08
8.67.2418.672.428.672438.67.24
8.77.4118.774.128.774138.77.41
8.87.5918.875.928.875938.87.59
8.97.7618.977.628.977638.97.76
9.07.9419.079.429.079439.07.94
9.18.1319.181.329.181339.18.13
9.28.3219.283.229.283239.28.32
9.38.5119.385.129.385139.38.51
9.48.7119.487.129.487139.48.71
9.58.9119.589.129.589139.58.91
9.69.1219.691.229.691239.69.12
9.79.3319.793.329.793339.79.33
9.89.5519.895.529.895539.89.55
9.99.7719.997.729.997739.99.77

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