Calculator
What the Kilowatt Converter does
Kilowatt Converter: 1 kW = 1.34102209 hp, so multiply a kilowatt value by 1.34102209 to get horsepower (mechanical), or divide to go back. Example: 1 kW = 1.34102209 hp.
Result, How it was calculated and Reverse conversion, derived from Value, From and To. You can nudge a single number and watch the effect straight away.
Most people who open the Kilowatt Converter are anyone working across two measurement systems. Having the exact factor matters more than a rough mental estimate.
There is no account, no upload and no server round trip, because the page does the work itself.
If you want to check the arithmetic, the field table, the method and a worked example are further down.
What do the Kilowatt Converter fields mean?
The Kilowatt Converter uses 3 inputs. You do not have to fill everything in before seeing an answer; the starting values already produce one.
| Field | What to enter | Default |
|---|---|---|
| Value | required | 1 |
| From | choose from Milliwatt (mW), Watt (W), Kilowatt (kW), Megawatt (MW), Gigawatt (GW) or Horsepower (mechanical) (hp) | Kilowatt (kW) |
| To | choose from Milliwatt (mW), Watt (W), Kilowatt (kW), Megawatt (MW), Gigawatt (GW) or Horsepower (mechanical) (hp) | Horsepower (mechanical) (hp) |
How does the Kilowatt Converter work?
Both units are converted through power's base unit (W), so any of the 9 units in the dropdowns can be paired in either direction without loss of accuracy.
Factors follow the internationally agreed definitions. The inch has been exactly 25.4 mm since 1959, and an exact definition is used wherever one exists. Where a unit is fixed by measurement rather than by agreement, the accepted CODATA or IAU value is used.
Worked example
These are the values the Kilowatt Converter loads by default, and the result it produces from them. This is the worked example the page starts from, reproduced here so you can check the arithmetic.
| Value | 1 |
|---|---|
| From | Kilowatt (kW) |
| To | Horsepower (mechanical) (hp) |
| Result | 1.34102209 hp |
|---|---|
| How it was calculated | 1 kW = 1.34102209 hp, so 1 × 1.34102209 = 1.34102209 hp |
| Reverse conversion | 0.74569987 kW (if you meant 1 hp) |
Kilowatts and horsepower
1 mechanical horsepower equals exactly 0.7456998715822702 kilowatts: the same constant as the watt-to-horsepower conversion, just scaled by a factor of 1,000.
Worth knowing
- Electric vehicle and appliance power ratings worldwide are almost always given in kilowatts, while traditional internal-combustion engine power is still very commonly quoted in horsepower, especially in marketing: this conversion bridges the two conventions for comparing vehicle specifications.
- Remember there are two horsepower units in circulation: mechanical/imperial horsepower (745.7 W) used mainly in the US and UK, and metric horsepower/PS (735.5 W) used across much of continental Europe and Japan, the roughly 1.4% gap between them is small but real when comparing precise figures.
- Solar panel and home electrical system capacity is typically specified in kilowatts (panel output) or kilowatt-hours (energy produced over time), worth distinguishing kW from kWh here the same way watts and watt-hours differ elsewhere in the energy category.
Definitions: BIPM SI Brochure · NIST reference on units
How to use it
- Fill in Value.
- Pick a value for From: the options are Milliwatt (mW), Watt (W), Kilowatt (kW), Megawatt (MW), Gigawatt (GW) or Horsepower (mechanical) (hp).
- Pick a value for To: the options are Milliwatt (mW), Watt (W), Kilowatt (kW), Megawatt (MW), Gigawatt (GW) or Horsepower (mechanical) (hp).
- Live output means you can search for a target value by nudging an input up and down.
- The panel reports Result, How it was calculated and Reverse conversion.
- Copy Link puts the current inputs in the URL, so bookmarking it brings the same numbers back.
What this tool does not do
- Repeated conversions compound rounding, so convert once from the original value where possible.
- Factors use the internationally agreed definitions; some industries round them differently.
- Results are informational: check anything consequential against a second source.
- The tool cannot tell whether a number was entered in the unit you intended, so double-check the labels.
Frequently asked questions
The form asks for Value, From and To. Every box already holds a working value, letting you treat it as a what-if tool rather than a data-entry form.
With the values loaded when the page opens, result comes out as 1.34102209 hp. The figure is derived from the inputs above, so it updates whenever they do.
It is not stored or transmitted. The calculation happens locally and leaves no trace with us.
No. There is no account, no usage cap and no trial period. The site is funded by advertising rather than by charging for the tools.
Full double precision is used throughout; only the displayed figure is shortened.