Convert HP to kW Formula

Power Conversion Formula:

\[ P_{kW} = HP \times 0.746 \]

Power (kW):

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1. What is HP to kW Conversion?

Definition: This calculator converts power measurements from horsepower (HP) to kilowatts (kW).

Purpose: It helps engineers, mechanics, and technicians work with power units consistently across different measurement systems.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ P_{kW} = HP \times 0.746 \]

Where:

\( P_{kW} \) — Power in kilowatts
\( HP \) — Power in horsepower
0.746 — Conversion factor (1 HP = 0.746 kW)

Explanation: The conversion factor 0.746 comes from the exact definition that 1 mechanical horsepower equals 745.69987158227022 watts.

3. Importance of Power Unit Conversion

Details: Converting between HP and kW is essential when working with international specifications, electrical systems, or comparing engine performance.

4. Using the Calculator

Tips: Simply enter the horsepower value and the calculator will automatically compute the equivalent kilowatts.

5. Frequently Asked Questions (FAQ)

Q1: Is this conversion factor exact?
A: For mechanical horsepower, 1 HP = 0.7457 kW is the exact conversion (rounded to 0.746 for most practical purposes).

Q2: Does this work for all types of horsepower?
A: This uses mechanical horsepower (550 ft·lbf/s). Metric horsepower (PS) uses a slightly different conversion factor (1 PS = 0.7355 kW).

Q3: Why convert HP to kW?
A: kW is the SI unit of power used worldwide, while HP is more common in automotive and mechanical applications in some countries.

Q4: How precise is this conversion?
A: The calculator provides results to 3 decimal places, sufficient for most engineering applications.

Q5: Can I convert kW back to HP?
A: Yes, simply divide kW by 0.746 to get HP (or use our kW to HP converter if available).