Unit ConversionApril 28, 20266 min read

Power Converter: Convert Between Watts, Horsepower, BTU/hr, and More

Master power unit conversions with our comprehensive guide. Learn formulas for watts, horsepower, BTUs per hour, kilowatts, and their real-world applications.

Published April 28, 2026 · Updated June 19, 2026

Achyutananda Meher

Founder of Measurely

Digital power meter measuring electrical consumption

Introduction

Power measurements are everywhere � from light bulbs and car engines to industrial machinery. Our power converter handles all major power units.

Conversion Formulas and Factors

The watt is the SI base unit for power:

1 kW = 1000 W 1 MW = 1000 kW 1 hp (mechanical) = 745.7 W 1 hp (metric) = 735.5 W 1 BTU/hr = 0.293071 W kW to hp: hp = kW � 1.34102 hp to kW: kW = hp � 0.7457

How to Use the Converter

Our power converter supports all common units. For example, 100 hp = 74.57 kW.

Real-World Examples

Automotive: A car with 200 hp produces 149.14 kW. Appliances: A 1500 W space heater uses 1.5 kW. Industrial: A 500 kW generator = 670.5 hp.

Common Applications

Automotive: Comparing engine power across measurement systems
Electrical Engineering: Designing power systems and load calculations
HVAC: Sizing heating and cooling equipment by BTU/hr
Manufacturing: Specifying motor and machinery power
Energy Management: Monitoring and optimizing consumption

Tips for Accurate Conversions

1. Distinguish mechanical hp (745.7 W) from metric hp (735.5 W)
2. For electrical power: P = V � I for DC circuits
3. Apparent power (VA) differs from real power (W) in AC circuits

Conclusion

Power conversions are essential for automotive, electrical, HVAC, and industrial applications. Our power converter provides instant conversions. For more tools, see the complete guide to unit converters.

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About Achyutananda Meher

Founder of Measurely

Achyutananda Meher is the founder of Measurely. He created the platform to make unit conversions simple and intuitive for professionals and everyday users.

Frequently Asked Questions

What is the difference between watts and horsepower?

1 hp = 745.7 W. Watts are SI; hp is imperial.

How do I convert kW to hp?

Multiply kW by 1.34102 for mechanical hp.

What is the difference between kW and kWh?

kW is power (rate). kWh is energy (total consumption).

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