How to Convert watt to HP and HP to watt [Formulae with examples]

Watts and Horsepower are two power units. Watt is an electrical unit, whereas the HP is a mechanical unit. As an engineer/technician/electrician, you often encounter these two units and you might need to calculate current in motors or similar cases.
how-to-convert-watt-to-hp-and-hp-to-watt-formulae-with-examples
In such cases, you should know the conversion between watts and HP. Just use the equation below:

1 hp = 745.6 watts

Let's do an example of it.

Example: Convert 50 hp to watt

Solution: 50 hp = 50 * hp = 50 * 745.6 watt = 37285 watt

Another one for inverse:

Example: Convert 5000 watts to hp

Solution: 1 hp = 745.6 watts,

5000 * 1 hp = 5000 * 745.6 watts

5000 watt = 5000 * 1 hp / 745.6 = 6.70 hp

Let's consider a real-life case where you need it.

Example: Find the amp-size for a single phase 1/2 HP motor at 120 V having efficiency 80% and power factor 0.88

Solution: From formula: I = P / (V * PF * Effieiency)

The formula has power in watt units.

Now for applying it to our case

I = (1/2 * 745.6) / (120 * 0.8 * 0.88) = 4.41 A

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