Horsepower (mechanical) to Watt Converter
Power · unit-converter
Convert Horsepower (mechanical) to Watt 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: Watt (w)
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 Watt
The watt is the SI unit of power (one joule per second). All linear units in this converter are defined by a fixed watt equivalent.
How to convert horsepower (mechanical, 550 ft·lb/s) to watts
1 horsepower (mechanical) is equal to 745.69987158227025 watt when both are expressed in watt-equivalents:
1 hp = (745.6998715822702 W ÷ 1 W) w = 745.69987158227025 w
Each horsepower (mechanical) is defined as 745.6998715822702 W and each watt as 1 W in this tool, so one hp equals 745.6998715822702 ÷ 1 w = 745.69987158227025 w.
Let d(hp) be the numeric value in Horsepower (mechanical) (hp), and d(w) the value in Watt (w). Then:
d(w) = d(hp) × (745.6998715822702 / 1)
Equivalently, divide by how many hp fit into one w (watts per w divided by watts per hp):
d(w) = d(hp) ÷ 0.0013410220896
Or: watt = horsepower (mechanical) ÷ 0.0013410220896
Examples
Example #1: Convert 1 hp to watt
1 hp = 1 hp × (745.6998715822702/1) w = 745.699871582 w
1 hp = 1 hp ÷ 0.0013410220896 = 745.699871582 w
Intermediate watts: 745.699871582 W
Example #2: Convert 10 hp to watt
10 hp = 10 hp × (745.6998715822702/1) w = 7456.99871582 w
10 hp = 10 hp ÷ 0.0013410220896 = 7456.99871582 w
Intermediate watts: 7,456.99871582 W
Summary
To convert Horsepower (mechanical) to Watt, multiply the value in hp by the ratio of watts per hp divided by watts per w. Equivalently: value_w = value_hp × (745.6998715822702 / 1). Numerically, 1 hp equals 745.6998715822702 w.
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) (Watts). All linear values are mapped through watts first. The numeric factor is 7.456999e+2.
Conversion tables
| Horsepower (mechanical) (hp) | Watt (w) |
|---|---|
| 0.1 | 74.5699871582 |
| 1 | 745.699871582 |
| 2 | 1,491.39974316 |
| 3 | 2,237.09961475 |
| 4 | 2,982.79948633 |
| 5 | 3,728.49935791 |
| 6 | 4,474.19922949 |
| 7 | 5,219.89910108 |
| 8 | 5,965.59897266 |
| 9 | 6,711.29884424 |
| Horsepower (mechanical) (hp) | Watt (w) |
|---|---|
| 10 | 7,456.99871582 |
| 20 | 14,913.9974316 |
| 30 | 22,370.9961475 |
| 40 | 29,827.9948633 |
| 50 | 37,284.9935791 |
| 60 | 44,741.9922949 |
| 70 | 52,198.9910108 |
| 80 | 59,655.9897266 |
| 90 | 67,112.9884424 |
| 100 | 74,569.9871582 |