Mechanical horsepower.
Horsepowers to Deciwatts Converter — hp to dW
Convert Horsepower (hp) to Deciwatt (dW) using the exact conversion factor (1 horsepower = 7,456.998716 deciwatt). See the formula, worked examples, conversion table, history, and common uses.
Horsepowers to Deciwatts converter
Converter
Power Converter
Convert watts, horsepower, refrigeration tons, BTU per hour, and engineering power units.
Context values
Some unit families need one extra value for a physically accurate result.
Deciwatt is 0.1 watt units.
Result = input x 745.6998716 / 0.1.
Power uses the watt as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Horsepowers to Deciwatts
Horsepower and Deciwatt both describe power output, and the conversion is a routine part of comparing an engine or motor's spec sheet across countries that use different power units. Horsepower is most often used for us and uk vehicle engine power ratings.
Formula
deciwatts = horsepowers × 7456.99871582
This factor comes from each unit's defined relationship to the category's base unit: 1 horsepower equals 745.699871582 base units, and 1 deciwatt equals 0.1 base units, so dividing one by the other gives the direct horsepower-to-deciwatt factor of 7456.99871582.
Simple example
1 hp × 7456.998716 = 7,456.998716 dW
1 horsepower = 7,456.998716 deciwatts.
Real-world example
100 hp × 7456.998716 = 745,699.8716 dW
100 horsepowers = 745,699.8716 deciwatts.
Conversion table
| Horsepower (hp) | Deciwatt (dW) |
|---|---|
| 1 hp | 7,456.998716 dW |
| 10 hp | 74,569.98716 dW |
| 100 hp | 745,699.8716 dW |
| 500 hp | 3,728,499.358 dW |
| 1,000 hp | 7,456,998.716 dW |
| 5,000 hp | 37,284,993.58 dW |
Reverse conversion: Deciwatt to Horsepower
1 dW × 0.000134102209 = 0.0001341022 hp
1 deciwatt = 0.0001341022 horsepowers.
horsepowers = deciwatts × 0.00013410220896
For a page dedicated to this direction, see Deciwatt 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 Deciwatt (dW)
Deciwatt is 0.1 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 deciwatts are in 1 horsepower?
1 horsepower equals 7,456.998716 deciwatts, using the exact defined conversion factor rather than an estimate.
How do I convert horsepower to deciwatt?
Multiply the horsepower value by 7456.998716. The converter above does this instantly to whatever precision you set.
How do I convert deciwatt back to horsepower?
Use the reverse factor: 1 deciwatt equals 0.0001341022 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 deciwatt?
Deciwatt (dW) is a unit of power.
Is the horsepower to deciwatt 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)