dBm to Watts Table: Power in watts by Power in dBm
Reference table of power in watts for dBm to Watts across a range of power in dbm values — exact, engine-computed figures you can read off at a glance.
dBm to Watts Calculator
Verified formula Updated Jun 2026 Private — runs on your device
Verified formula
Private
Power in watts
1.000000
- Power in milliwatts
- 1,000.0000
For general information only — not financial, tax, legal or medical advice. Verify before you rely on it.
How to use the dBm to Watts Calculator
The dBm to Watts Calculator works out your power in watts, along with 1 related figure in an instant. Enter power in dbm and the result updates as you type — it is free, needs no sign-up, and runs entirely in your browser so your figures stay private.
- Enter the power in dbm.
- Read off your power in watts, together with power in milliwatts — the calculator updates automatically, with no button to press.
Formula
The dBm to Watts Calculator uses the formula:
Power in watts = pow(10, (Power in dBm - 30) ÷ 10)
Worked example
For example, with power in dbm of 30 dBm, the power in watts is 1.000000.
| Power in dBm | 30 dBm |
|---|
| Power in watts | 1.000000 |
|---|---|
| Power in milliwatts | 1,000.0000 |
Results are estimates for educational use, not professional advice.
Frequently asked questions
Use watts = 10^((dBm − 30) ÷ 10). 30 dBm equals 1 watt, and 0 dBm equals 1 milliwatt.
dBm is power on a decibel scale referenced to 1 milliwatt. It is common in radio, RF and networking.
Signal powers span a huge range. The decibel scale compresses them into manageable numbers and makes gains and losses simple to add.
0 dBm is exactly 1 milliwatt. Every 10 dB increase multiplies the power by ten, so 10 dBm is 10 mW and 20 dBm is 100 mW.
The dBm to Watts Calculator uses the formula: Power in watts = pow(10, (Power in dBm - 30) ÷ 10). For example, with power in dbm of 30 dBm, the power in watts is 1.000000.
Enter the power in dbm. Read off your power in watts, together with power in milliwatts — the calculator updates automatically, with no button to press.
Related guides
How to Calculate dBm to Watts: Formula, Steps & Examples
Learn how to calculate dBm to Watts — the formula explained step by step, with worked examples and a free calculator to check your answer.