Horsepower (mechanical) to Kilowatt Converter
Power · unit-converter
Convert Horsepower (mechanical) to Kilowatt with a fixed input and output unit, step-by-step formula line, and reference tables. Linear units use SI watt definitions; mechanical hp uses 550 ft·lbf/s; BTU/h uses the IT BTU; dBm/dBW are logarithmic relative to 1 mW and 1 W. The full Power Converter also includes PS/CV, TR, kVA/MVA, and ft·lb/s.
Calculator
From: Horsepower (mechanical) (hp)
To: Kilowatt (kw)
About Horsepower (mechanical)
Mechanical horsepower here is the US definition: 550 ft·lbf/s ≈ 745.70 W. Automotive and industrial specs often cite hp.
About Kilowatt
One kilowatt is 1,000 W. Motor, heater, and grid-scale loads are often rated in kW.
How to convert horsepower (mechanical, 550 ft·lb/s) to kilowatts
1 horsepower (mechanical) is equal to 0.74569987158227 kilowatt when both are expressed in watt-equivalents:
1 hp = (745.6998715822702 W ÷ 1,000 W) kw = 0.74569987158227 kw
1 mechanical hp ≈ 0.74569987 kW (exact definition via 550 ft·lbf/s).
Each horsepower (mechanical) is defined as 745.6998715822702 W and each kilowatt as 1,000 W in this tool, so one hp equals 745.6998715822702 ÷ 1,000 kw = 0.74569987158227 kw.
Let d(hp) be the numeric value in Horsepower (mechanical) (hp), and d(kw) the value in Kilowatt (kw). Then:
d(kw) = d(hp) × (745.6998715822702 / 1,000)
Equivalently, divide by how many hp fit into one kw (watts per kw divided by watts per hp):
d(kw) = d(hp) ÷ 1.34102208959503
Or: kilowatt = horsepower (mechanical) ÷ 1.34102208959503
Examples
Example #1: Convert 1 hp to kilowatt
1 hp = 1 hp × (745.6998715822702/1,000) kw = 0.7456998716 kw
1 hp = 1 hp ÷ 1.34102208959503 = 0.7456998716 kw
Intermediate watts: 745.699871582 W
Example #2: Convert 10 hp to kilowatt
10 hp = 10 hp × (745.6998715822702/1,000) kw = 7.4569987158 kw
10 hp = 10 hp ÷ 1.34102208959503 = 7.4569987158 kw
Intermediate watts: 7,456.99871582 W
Summary
To convert Horsepower (mechanical) to Kilowatt, multiply the value in hp by the ratio of watts per hp divided by watts per kw. Equivalently: value_kw = value_hp × (745.6998715822702 / 1000). Numerically, 1 hp equals 0.7456998715822702 kw.
Relationship context
You are converting between mechanical power (horsepower, ft·lb/s) (Horsepower (mechanical, 550 ft·lb/s)) and SI / decimal power (watts and prefixes) (Kilowatts). All linear values are mapped through watts first. The numeric factor is 7.456999e-1.
Conversion tables
| Horsepower (mechanical) (hp) | Kilowatt (kw) |
|---|---|
| 0.1 | 0.0745699872 |
| 1 | 0.7456998716 |
| 2 | 1.4913997432 |
| 3 | 2.2370996147 |
| 4 | 2.9827994863 |
| 5 | 3.7284993579 |
| 6 | 4.4741992295 |
| 7 | 5.2198991011 |
| 8 | 5.9655989727 |
| 9 | 6.7112988442 |
| Horsepower (mechanical) (hp) | Kilowatt (kw) |
|---|---|
| 10 | 7.4569987158 |
| 20 | 14.9139974316 |
| 30 | 22.3709961475 |
| 40 | 29.8279948633 |
| 50 | 37.2849935791 |
| 60 | 44.7419922949 |
| 70 | 52.1989910108 |
| 80 | 59.6559897266 |
| 90 | 67.1129884424 |
| 100 | 74.5699871582 |