Convert

Watt to Kilowatt

Exact answer: 1 W = 0.001 kW (exact – SI decimal prefix)

Watt and Kilowatt both belong to the Power family. The difference is a decimal prefix, so the factor is a clean power of ten. Power figures appear in vehicle documents, engine data, heating load calculations and appliance ratings.

Unit console

Convert units with formula, context and precision

UnitCloud is a local measurement lab for everyday work, engineering, IT, energy, mobility and design. Every conversion shows result, formula, base unit, rounding and the common mistake.

What do you want to convert?

From100 W

Result0.1 kW

Factor1 W = 0.001 kW

Source basisBIPM SI Brochure · NIST Guide to SI Appendix B

Examples

01100 W = 0.1 kW

Example value from the reference table. Internal calculation uses stored factors; display output is rounded.

02Common mistake

PS and hp are not identical. Vehicle data often uses metric horsepower, while US/UK contexts often use mechanical horsepower.

03Base unit: W

1 W = 0.001 kW. Watt is the base unit of the family, so the value is converted directly.

Table

Watt to Kilowatt
Watt	Kilowatt
100	0.1
500	0.5
1,000	1
1,500	1.5
2,000	2
3,500	3.5

Formula

1 W = 0.001 kW. Watt is the base unit of the family, so the value is converted directly.

Sources

BIPM SI BrochureSI base units, prefixes and official SI context.NIST Guide to SI Appendix BNIST conversion-factor method and non-SI factors.

Related conversions

Kilowatt to Metric horsepowerkW → PSPower Metric horsepower to KilowattPS → kWPower Kilowatt to Mechanical horsepowerkW → hpPower Watt to BTU per hourW → BTU/hPower

Search and practice paths

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Factor origin

Factors come from the stored source family and are not derived from rounded display values.

Rounding rule

UnitCloud keeps calculating with stored factors and rounds only the displayed output by selected precision.

When not to use

Do not use as the sole basis for official, medical, safety-critical or contractual decisions.

Citation

Citation note: UnitCloud, conversion with formula, sources reviewed: September 2026. Power. Source basis: BIPM SI Brochure · NIST Guide to SI Appendix B.

Common questions

What is the factor for Watt to Kilowatt?

1 W = 0.001 kW

Which formula does Watt to Kilowatt use?

1 W = 0.001 kW. Watt is the base unit of the family, so the value is converted directly.

What is the most common mistake?

PS and hp are not identical. Vehicle data often uses metric horsepower, while US/UK contexts often use mechanical horsepower.

When should I verify the result?

Do not use as the sole basis for official, medical, safety-critical or contractual decisions.