Watts to Milliwatts Conversion Calculator

Watts to Milliwatts Calculator

Enter power in watts:

milliwatts result: mW

Convert power measurements between watts (W) and milliwatts (mW) for:
✅ Electronics design
✅ RF engineering
✅ Low-power device specifications
✅ Precision measurements

Key Definitions

• Watt (W): SI unit of power (1W = 1 joule/second)
• Milliwatt (mW): 1/1000th of a watt (1mW = 0.001W)

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Conversion Formulas

1. Watts to Milliwatts

$$P(mW)=P(W)\times 1,000$$

Example:

• Convert 0.25W to mW:

$$0.25\times 1,000=250\text{ mW}$$

2. Milliwatts to Watts

$$P(W)=\frac{P(mW)}{1,000}$$

Example:

• Convert 500mW to W:

$$500÷1,000=0.5\text{ W}$$

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Conversion Table (W ⇆ mW)

Watts (W)	Milliwatts (mW)
0.001 W	1 mW
0.01 W	10 mW
0.1 W	100 mW
1 W	1,000 mW
2 W	2,000 mW
5 W	5,000 mW
10 W	10,000 mW

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How to Use

1. Enter Watts → Get mW (Multiply by 1,000)

2. Enter mW → Get Watts (Divide by 1,000)

Example Calculations:

• 1.2W to mW:

$$1.2\times 1,000=1,200\text{ mW}$$

• 750mW to W:

$$750÷1,000=0.75\text{ W}$$

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Practical Applications

• Bluetooth devices: Typically 1-100mW (0.001-0.1W)
• Laser pointers: Often 5mW (0.005W)
• IoT sensors: Usually 10-100mW (0.01-0.1W)

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Power Unit Scale

Unit	Watts	Milliwatts
1 mW	0.001 W	1 mW
1 W	1 W	1,000 mW
1 kW	1,000 W	1,000,000 mW

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FAQ

1. How many mW in 1 Watt?

✅ 1 W = 1,000 mW

2. When should I use mW vs W?

🔹 mW for low-power electronics
🔹 W for household appliances

3. Is 500mW equal to 0.5W?

✅ Yes - 500mW = 0.5W

4. How to convert 0.03W to mW?

$$0.03\times 1,000=30\text{ mW}$$

5. What's smaller than a milliwatt?

🔹 Microwatt (μW) - 1mW = 1,000μW