Mechanical horsepower.
Horsepowers to Hectowatts Converter — hp to hW
Convert Horsepower (hp) to Hectowatt (hW) using the exact conversion factor (1 horsepower = 7.456998716 hectowatt). See the formula, worked examples, conversion table, history, and common uses.
Horsepowers to Hectowatts converter
Converter
Engineering Converter
Convert common stress, force, torque, power, and energy units used in engineering.
Context values
Some unit families need one extra value for a physically accurate result.
Hectowatt is 100 watt units.
Result = input x 745.6998716 / 100.
Power units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Horsepowers to Hectowatts
Horsepower and Hectowatt both measure a quantity used in structural or mechanical engineering — commonly stress, pressure, force, torque, power, or energy — where converting between the unit conventions used in different regions, industries, or equipment specifications is a routine part of design work. Horsepower is most often used for us and uk vehicle engine power ratings.
Formula
hectowatts = horsepowers × 7.45699871582
This factor comes from each unit's defined relationship to the category's base unit: 1 horsepower equals 745.699871582 base units, and 1 hectowatt equals 100 base units, so dividing one by the other gives the direct horsepower-to-hectowatt factor of 7.45699871582.
Simple example
1 hp × 7.456998716 = 7.456998716 hW
1 horsepower = 7.456998716 hectowatts.
Real-world example
100 hp × 7.456998716 = 745.6998716 hW
100 horsepowers = 745.6998716 hectowatts.
Conversion table
| Horsepower (hp) | Hectowatt (hW) |
|---|---|
| 1 hp | 7.456998716 hW |
| 10 hp | 74.56998716 hW |
| 50 hp | 372.8499358 hW |
| 100 hp | 745.6998716 hW |
| 500 hp | 3,728.499358 hW |
| 1,000 hp | 7,456.998716 hW |
Reverse conversion: Hectowatt to Horsepower
7.456998716 hW × 0.134102209 = 1 hp
7.456998716 hectowatts = 1 horsepowers.
horsepowers = hectowatts × 0.13410220896
For a page dedicated to this direction, see Hectowatt to Horsepower.
Understanding the Horsepower
Horsepower (hp) measures power. Mechanical horsepower is defined as exactly 745.6998715822702 watts. It is classified as a US/imperial customary unit.
Where it's used: United States and United Kingdom (vehicle and engine specifications)
Mechanical horsepower vs. metric horsepower. Mechanical horsepower (745.7 W) and metric horsepower/PS (735.5 W) differ by about 1.4% — a US car spec sheet in 'hp' and a European one in 'PS' are not directly comparable numbers without conversion.
Uses of the Horsepower today
- US and UK vehicle engine power ratings
- Motor and engine specifications in English-speaking markets
History of the Horsepower
James Watt popularized horsepower in the 1780s as a marketing figure, comparing his steam engines' output to the working capacity of a horse (based on his estimate of a horse turning a mill), so buyers could grasp engine capability in familiar terms. The unit stuck long after its origin as a sales tool, eventually being formally defined at exactly 550 foot-pounds per second.
Historical origin. Horsepower was not the invention of a single named person; it developed through the process described above.
Understanding the Hectowatt (hW)
Hectowatt is 100 watt units.
Horsepower — sources
- NIST Special Publication 811 — Documents the exact watt-equivalence of mechanical horsepower.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many hectowatts are in 1 horsepower?
1 horsepower equals 7.456998716 hectowatts, using the exact defined conversion factor rather than an estimate.
How do I convert horsepower to hectowatt?
Multiply the horsepower value by 7.456998716. The converter above does this instantly to whatever precision you set.
How do I convert hectowatt back to horsepower?
Use the reverse factor: 1 hectowatt equals 0.134102209 horsepowers. You can also use the swap control in the converter above to flip the direction instantly.
What is a horsepower?
Horsepower (hp) measures power. Mechanical horsepower is defined as exactly 745.6998715822702 watts. It is classified as a US/imperial customary unit.
What is a hectowatt?
Hectowatt (hW) is a unit of engineering.
Is the horsepower to hectowatt conversion exact?
Yes. Mechanical horsepower is defined as exactly 745.6998715822702 watts. That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.
What is the difference between mechanical horsepower vs. metric horsepower?
Mechanical horsepower (745.7 W) and metric horsepower/PS (735.5 W) differ by about 1.4% — a US car spec sheet in 'hp' and a European one in 'PS' are not directly comparable numbers without conversion.
Where is the horsepower still used today?
United States and United Kingdom (vehicle and engine specifications)