If you play around with electronics and telecommunications, you will sometimes need to convert watts to dBm. Namely, we are converting power in watts to power in decibel-milliwatts (dBm). The conversion is a bit complex, that’s why we prepared these 2 tools that make all of this very simple:
- Watts To dBm Calculator. Simply input watts, and you get dBm right away.
- Watts To dBm Conversion Chart. We converted watts ranging from 0.001 W to 1,000,000 W, and converted them into dBm. You will find the resulting complete conversion chart below the calculator.
Quick Example: How dBM is 30 watts? Here, we use dBm = 10 ร log10 (Watts ร 1000 / 1 mW) equation to calculate that 30 watts is equal to 44.77 dBm. The calculator does this automatically.
Here is how this calculator works:
Let’s say you want to convert 8 watts to dBm. You just insert ‘8’ in the watts input field, and you get this result automatically (screenshot):
You can immediately see that 8 watts is equal to 39.03 dBm.
You can also calculate this manually by inserting 8 watts in the following watts to dBm formula:
dBm = 10 ร log10 (Watts ร 1000 / 1 mW)
dBm (8 Watts) = 10 ร log10 (8 Watts ร 1000 / 1 mW) = 39.03 dBm
This is just one example. Here is the complete conversion chart you can just look up the watts to dBm equivalents:
Watts To dBm Conversion Chart
| W (Watts): | dBm (decibels milliwatts): |
| 0.001 W | 0.00 dBm |
| 0.005 W | 6.99 dBm |
| 0.01 W | 10.00 dBm |
| 0.05 W | 16.99 dBm |
| 0.1 W | 20.00 dBm |
| 0.5 W | 26.99 dBm |
| 1 W | 30.00 dBm |
| 2 W | 33.01 dBm |
| 3 W | 34.77 dBm |
| 4 W | 36.02 dBm |
| 5 W | 36.99 dBm |
| 6 W | 37.78 dBm |
| 7 W | 38.45 dBm |
| 8 W | 39.03 dBm |
| 9 W | 39.54 dBm |
| 10 W | 40.00 dBm |
| 20 W | 43.01 dBm |
| 30 W | 44.77 dBm |
| 40 W | 46.02 dBm |
| 50 W | 46.99 dBm |
| 60 W | 47.78 dBm |
| 70 W | 48.45 dBm |
| 80 W | 49.03 dBm |
| 90 W | 49.54 dBm |
| 100 W | 50.00 dBm |
| 200 W | 53.01 dBm |
| 300 W | 54.77 dBm |
| 400 W | 56.02 dBm |
| 500 W | 56.99 dBm |
| 600 W | 57.78 dBm |
| 700 W | 58.45 dBm |
| 800 W | 59.03 dBm |
| 900 W | 59.54 dBm |
| 1,000 W | 60.00 dBm |
| 2,000 W | 63.01 dBm |
| 3,000 W | 64.77 dBm |
| 4,000 W | 66.02 dBm |
| 5,000 W | 66.99 dBm |
| 6,000 W | 67.78 dBm |
| 7,000 W | 68.45 dBm |
| 8,000 W | 69.03 dBm |
| 9,000 W | 69.54 dBm |
| 10,000 W | 70.00 dBm |
| 20,000 W | 73.01 dBm |
| 30,000 W | 74.77 dBm |
| 40,000 W | 76.02 dBm |
| 50,000 W | 76.99 dBm |
| 60,000 W | 77.78 dBm |
| 70,000 W | 78.45 dBm |
| 80,000 W | 79.03 dBm |
| 90,000 W | 79.54 dBm |
| 100,000 W | 80.00 dBm |
| 1,000,000 W | 90.00 dBm |
We hope this makes the watts to decibel-milliwatts conversion much easier. If you need any help, you can always use the comment section below, tell us what you are trying to solve, and we can give you a hand.