📡 dBm ↔ Watts Converter

🛡️ 100% Client‑Side — Private
Real‑time · Scientific notation · Common RF references
🔽 dBm to Watts
=
0.001 W
1.000000 × 10⁻³ W
Also: 1.000 mW
🔼 Watts to dBm
=
0.00 dBm
1 W = 30 dBm · 0 dBm = 1 mW
Decimal places:
📊 Common RF Power References
ApplicationPower (dBm)Power (Watts)
Bluetooth 5.0 max10 dBm0.01 W
Wi‑Fi access point20 dBm0.1 W
4G phone uplink23 dBm0.1995 W
Handheld VHF radio30 dBm1 W
Satellite modem40 dBm10 W
Microwave oven limit50 dBm100 W
AM broadcast60 dBm1000 W
Radar system70 dBm10000 W
Click any row to load values.
📐 Conversion Formulas

dBm to Watts:

P(W) = 10((P(dBm) - 30) / 10)

Watts to dBm:

P(dBm) = 10 × log10(P(W) × 1000)

Key: 0 dBm = 1 mW · 30 dBm = 1 W · +10 dB = ×10 power

✓ Real‑time · Scientific notation · No server

📘 dBm to Watts Guide

dBm (decibel-milliwatt) is a logarithmic unit used in RF engineering, telecommunications, and fiber optics to express absolute power levels relative to 1 milliwatt. Use this converter to quickly translate between dBm and watts.

❓ FAQ

What is dBm?

dBm is a logarithmic measure of power referenced to 1 milliwatt. 0 dBm = 1 mW, 30 dBm = 1 W. It's widely used in RF and telecommunications because it can represent very large and very small power values compactly.

How do I convert dBm to watts manually?

Use the formula: P(W) = 10^((dBm - 30) / 10). For example, 20 dBm = 10^((20-30)/10) = 10^(-1) = 0.1 W.

Why does +10 dB equal 10× power?

Because dBm is a logarithmic scale using base‑10 logarithms. A 10 dB increase means multiplying the power by 10; a 3 dB increase roughly doubles the power.

What are typical dBm values in Wi‑Fi?

Wi‑Fi access points typically transmit at 20 dBm (0.1 W). Client devices like smartphones often transmit around 10-15 dBm.