How many kilowatts are in 1 watt?

1 W equals 0.001 kW. This is an exact conversion factor defined by NIST.

How do I convert watts to kilowatts?

Multiply the value in W by the conversion factor. For example, 10 W = 0.01 kW. Use our calculator above for instant results.

Is the watts to kilowatts conversion exact?

Yes, this conversion is mathematically exact based on the international definition of these units (NIST SP 811).

Can I convert watts to kilowatts offline?

Yes! OmniConvert runs entirely in your browser — no internet connection needed after the page loads. Your data never leaves your device, ensuring complete privacy.

What is the difference between watts and kilowatts?

Watts (W) and Kilowatts (kW) are both units of power but belong to different measurement systems. 1 W = 0.001 kW. Use the converter above to switch between them instantly.

Watts to Kilowatts (W → kW) — Free Online Converter

W → kW Reference Table

W	kW
0.001 W	0.000001 kW
0.002 W	0.000002 kW
0.003 W	0.000003 kW
0.004 W	0.000004 kW
0.005 W	0.000005 kW
0.006 W	0.000006 kW
0.007 W	0.000007 kW
0.008 W	0.000008 kW
0.009 W	0.000009 kW
0.01 W	0.00001 kW
0.02 W	0.00002 kW
0.03 W	0.00003 kW
0.04 W	0.00004 kW
0.05 W	0.00005 kW
0.06 W	0.00006 kW
0.07 W	0.00007 kW
0.08 W	0.00008 kW
0.09 W	0.00009 kW
0.1 W	0.0001 kW
0.2 W	0.0002 kW
0.3 W	0.0003 kW
0.4 W	0.0004 kW
0.5 W	0.0005 kW
0.6 W	0.0006 kW
0.7 W	0.0007 kW
0.8 W	0.0008 kW
0.9 W	0.0009 kW
1 W	0.001 kW
1.5 W	0.0015 kW
2 W	0.002 kW
2.5 W	0.0025 kW
3 W	0.003 kW
3.5 W	0.0035 kW
4 W	0.004 kW
4.5 W	0.0045 kW
5 W	0.005 kW
5.5 W	0.0055 kW
6 W	0.006 kW
6.5 W	0.0065 kW
7 W	0.007 kW
7.5 W	0.0075 kW
8 W	0.008 kW
8.5 W	0.0085 kW
9 W	0.009 kW
9.5 W	0.0095 kW
10 W	0.01 kW
11 W	0.011 kW
12 W	0.012 kW
13 W	0.013 kW
14 W	0.014 kW
15 W	0.015 kW
16 W	0.016 kW
17 W	0.017 kW
18 W	0.018 kW
19 W	0.019 kW
20 W	0.02 kW
25 W	0.025 kW
30 W	0.03 kW
35 W	0.035 kW
40 W	0.04 kW
45 W	0.045 kW
50 W	0.05 kW
55 W	0.055 kW
60 W	0.06 kW
65 W	0.065 kW
70 W	0.07 kW
75 W	0.075 kW
80 W	0.08 kW
85 W	0.085 kW
90 W	0.09 kW
95 W	0.095 kW
100 W	0.1 kW
120 W	0.12 kW
125 W	0.125 kW
130 W	0.13 kW
140 W	0.14 kW
150 W	0.15 kW
160 W	0.16 kW
175 W	0.175 kW
180 W	0.18 kW
200 W	0.2 kW
225 W	0.225 kW
250 W	0.25 kW
275 W	0.275 kW
300 W	0.3 kW
350 W	0.35 kW
400 W	0.4 kW
450 W	0.45 kW
500 W	0.5 kW
600 W	0.6 kW
700 W	0.7 kW
750 W	0.75 kW
800 W	0.8 kW
900 W	0.9 kW
1000 W	1 kW
1200 W	1.2 kW
1250 W	1.25 kW
1500 W	1.5 kW
1750 W	1.75 kW
2000 W	2 kW
2500 W	2.5 kW
3000 W	3 kW
4000 W	4 kW
4500 W	4.5 kW
5000 W	5 kW
6000 W	6 kW
7000 W	7 kW
7500 W	7.5 kW
8000 W	8 kW
9000 W	9 kW
10000 W	10 kW
15000 W	15 kW
20000 W	20 kW
25000 W	25 kW
50000 W	50 kW
75000 W	75 kW
100000 W	100 kW

Values based on NIST SP 811 conversion factors

Why Convert Watts to Kilowatts?

Converting between watts (W) and kilowatts (kW) is one of the most common power conversions. Whether for engineering, cooking, travel, or science, knowing how to quickly convert W to kW saves time and prevents errors.

Power conversions (W to kW) are essential for automotive enthusiasts, electrical engineers, and athletes. Car buyers frequently convert horsepower to kilowatts to compare engine performance across international brands. In electrical engineering, sizing generators and motors requires consistent power units to prevent overloads and ensure compatibility. Cyclists and rowers use power meters to track output in watts, converting these figures to estimate calorie burn or compare efforts. Misinterpreting power ratings can result in buying underpowered equipment or damaging electrical systems, highlighting the need for accurate conversion tools.

How to Convert Watts to Kilowatts

To convert watts to kilowatts, use the following formula:

kW = W × 0.001

Example: 1 W = 0.001 kW

For example, 5 W = 0.005 kW, 10 W = 0.01 kW, and 100 W = 0.1 kW. For larger values, 1000 W = 1 kW. Conversely, 1 kW = 1000 W. Our calculator above performs this conversion instantly with full precision — no rounding errors.

Common Use Cases

A microwave oven at full power: 1000 W = 1 kW
A traditional incandescent light bulb: 60 W = 0.06 kW
An electric kettle: 2000 W = 2 kW
A portable space heater: 1500 W = 1.5 kW
A laptop computer while charging: 100 W = 0.1 kW

Common Mistakes to Avoid

kW vs kWh: kW is power (rate), kWh is energy (total used).
HP variations: Mechanical HP (~745.7W) vs Metric HP (~735.5W).
Apparent Power: Watts vs Volt-Amps (VA) differ due to power factor.

Pro Tips

LED bulbs: A 10W LED replaces a 60W incandescent (saves energy).
Appliance labels: Check the back label for Wattage to avoid overloading strips.
Solar panels: Ratings are 'Peak Watts' (ideal conditions), expect less in reality.

What is a Watt?

The watt (W) is the SI derived unit of power. Defined as one joule per second. Named after James Watt.

Watts are used universally to measure the rate of energy transfer, commonly for light bulbs, electronics, and small appliances.

What is a Kilowatt?

The kilowatt (kW) is a unit of power equal to 1,000 watts. It measures the rate at which energy is used or generated.

Kilowatts are used to measure the power output of engines (motors), heaters, and residential electricity consumption rates.

Watts → Kilowatts

Watts to Kilowatts Formula