1. What is Watts to Horsepower Conversion?

Definition: This calculator converts electric motor power from watts to horsepower.

Purpose: It helps electrical engineers, mechanics, and DIY enthusiasts understand motor power ratings in different units.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( HP \) — Horsepower
• \( P_w \) — Power in watts

Explanation: 1 mechanical horsepower is equal to 746 watts. This conversion factor comes from the original definition of horsepower.

3. Importance of Power Conversion

Details: Understanding both watt and horsepower ratings is essential for proper motor selection, performance comparison, and system design.

4. Using the Calculator

Tips: Enter the motor power in watts. The value must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Why 746 watts per horsepower?
A: This comes from James Watt's original definition of horsepower based on the work a horse could do moving coal from a mine.

Q2: Is this for mechanical or electrical HP?
A: This calculates mechanical horsepower. Metric horsepower (used in Europe) uses a different conversion factor (735.5 watts).

Q3: Can I convert HP back to watts?
A: Yes, simply multiply HP by 746 to get watts.

Q4: What's a typical wattage for household motors?
A: Common household motors range from 300W (0.4HP) for small appliances to 1500W (2HP) for larger tools.

Q5: How accurate is this conversion?
A: This is the standard theoretical conversion. Actual motor performance may vary due to efficiency factors.