Watt to Horsepower (mechanical) Converter
Power · unit-converter
Convert Watt to Horsepower (mechanical) 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: Watt (w)
To: Horsepower (mechanical) (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.
About Horsepower (mechanical)
Mechanical horsepower here is the US definition: 550 ft·lbf/s ≈ 745.70 W. Automotive and industrial specs often cite hp.
How to convert watts to horsepower (mechanical, 550 ft·lb/s)
1 watt is equal to 0.0013410220896 horsepower (mechanical) when both are expressed in watt-equivalents:
1 w = (1 W ÷ 745.6998715822702 W) hp = 0.0013410220896 hp
Each watt is defined as 1 W and each horsepower (mechanical) as 745.6998715822702 W in this tool, so one w equals 1 ÷ 745.6998715822702 hp = 0.0013410220896 hp.
Let d(w) be the numeric value in Watt (w), and d(hp) the value in Horsepower (mechanical) (hp). Then:
d(hp) = d(w) × (1 / 745.6998715822702)
Equivalently, divide by how many w fit into one hp (watts per hp divided by watts per w):
d(hp) = d(w) ÷ 745.69987158227025
Or: horsepower (mechanical) = watt ÷ 745.69987158227025
Examples
Example #1: Convert 1 w to horsepower (mechanical)
1 w = 1 w × (1/745.6998715822702) hp = 0.0013410221 hp
1 w = 1 w ÷ 745.69987158227025 = 0.0013410221 hp
Intermediate watts: 1 W
Example #2: Convert 10 w to horsepower (mechanical)
10 w = 10 w × (1/745.6998715822702) hp = 0.0134102209 hp
10 w = 10 w ÷ 745.69987158227025 = 0.0134102209 hp
Intermediate watts: 10 W
Summary
To convert Watt to Horsepower (mechanical), multiply the value in w by the ratio of watts per w divided by watts per hp. Equivalently: value_hp = value_w × (1 / 745.6998715822702). Numerically, 1 w equals 0.0013410220895950279 hp.
Relationship context
You are converting between SI / decimal power (watts and prefixes) (Watts) and mechanical power (horsepower, ft·lb/s) (Horsepower (mechanical, 550 ft·lb/s)). All linear values are mapped through watts first. The numeric factor is 1.341022e-3.
Conversion tables
| Watt (w) | Horsepower (mechanical) (hp) |
|---|---|
| 0.1 | 0.0001341022 |
| 1 | 0.0013410221 |
| 2 | 0.0026820442 |
| 3 | 0.0040230663 |
| 4 | 0.0053640884 |
| 5 | 0.0067051104 |
| 6 | 0.0080461325 |
| 7 | 0.0093871546 |
| 8 | 0.0107281767 |
| 9 | 0.0120691988 |
| Watt (w) | Horsepower (mechanical) (hp) |
|---|---|
| 10 | 0.0134102209 |
| 20 | 0.0268204418 |
| 30 | 0.0402306627 |
| 40 | 0.0536408836 |
| 50 | 0.0670511045 |
| 60 | 0.0804613254 |
| 70 | 0.0938715463 |
| 80 | 0.1072817672 |
| 90 | 0.1206919881 |
| 100 | 0.134102209 |