Power Converter
Convert between 60+ power units instantly - from nanoseconds to terawatts. Features popular conversions like HP to kW, watts to BTU/h, engine power ratings, and comprehensive real-world power comparisons.
Power Conversion Guide
Horsepower & Electrical
Horsepower was defined by James Watt to compare steam engines to horses
1 horsepower = 745.7 watts = 550 foot-pounds per second
Metric horsepower (PS) = 735.5 watts, slightly less than imperial HP
AC power has three types: real (watts), reactive (VAR), and apparent (VA)
Power factor = Real Power ÷ Apparent Power (ideal = 1.0)
Efficiency & Automotive
LED bulbs are 80-90% more efficient than incandescent bulbs
Electric motors can achieve 95%+ efficiency vs 25-30% for gas engines
Engine horsepower is measured at the crankshaft (brake HP)
Wheel horsepower is ~15-20% less due to drivetrain losses
Quick Conversion Tips
Human & Biological Power
Average human generates 100-400 watts during exercise
Tour de France cyclists sustain 250-400 watts for hours
Human heart generates about 1.5 watts continuously
Renewable Energy
Solar panels convert ~20% of sunlight to electricity
Wind turbines capture up to 59% of wind's kinetic energy (Betz limit)
Hydroelectric plants can exceed 90% efficiency
Professional power converter supporting 60+ units from nanowatts to terawatts. Accurate conversions for automotive, electrical, mechanical, and renewable energy applications.