dBm to Watts Calculator
Instantly convert dBm to watts and milliwatts, or reverse — watts/mW to dBm — with the standard power formula.
Power Converter
dBm
or enter watts / mW
W
mW
Conversion Results
Enter a value on the left to see results.
dBm
—
dBm
Watts
—
W
Milliwatts
—
mW
Common dBm Reference Levels
| dBm | Milliwatts | Watts | Typical Use |
|---|---|---|---|
| −100 | 1×10⁻¹⁰ | 1×10⁻¹³ | Minimum detectable signal |
| −70 | 1×10⁻⁷ | 1×10⁻¹⁰ | Weak Wi-Fi signal |
| −50 | 1×10⁻⁵ | 1×10⁻⁸ | Strong Wi-Fi signal |
| 0 | 1 | 0.001 | Reference level (1 mW) |
| 10 | 10 | 0.01 | Bluetooth class 1 |
| 20 | 100 | 0.1 | Wi-Fi access point output |
| 30 | 1,000 | 1 | Consumer cordless phone |
| 40 | 10,000 | 10 | Handheld radio transmitter |
| 60 | 1,000,000 | 1,000 | Commercial broadcast station |
Copied!
Summary
Instantly convert dBm to watts and milliwatts, or reverse — watts/mW to dBm — with the standard power formula.
How it works
- Enter a power value in dBm in the top input field.
- The tool instantly computes the equivalent power in watts and milliwatts.
- Alternatively, enter a value in watts or milliwatts to get dBm.
- Use the reference table for common power levels at a glance.
Use cases
- Calculate transmit power levels for Wi-Fi or cellular equipment.
- Convert signal strength readings from dBm to watts in RF design.
- Determine received signal power for link budget calculations.
- Verify amplifier output power in wireless communication systems.
- Convert antenna gain measurements between power units.
- Analyze cable or connector loss expressed in dBm terms.
Frequently Asked Questions
Last updated: 2026-07-01 ·
Reviewed by Nham Vu