Master Electrical & Power Converter
Instantly convert Watts, Kilowatts, Horsepower, and HVAC units. Built for engineers, mechanics, and facility managers.
Formula: Divide the power value by 1000
Capacity Meter
Visualize the load capacity and see what equipment it can run.
Why Do We Still Use Horsepower?
While the Watt (W) is the universal SI unit for power, Horsepower (hp) remains heavily embedded in the automotive and industrial sectors. This dates back to the 18th century when James Watt needed a marketing tool to compare his new steam engines to the power of draft horses.
Today, converting between the two is essential. A general rule of thumb used by electricians and mechanics is that 1 Mechanical Horsepower equals approximately 746 Watts (or 0.746 kW).
Watts vs. Volt-Amperes (VA)
In direct current (DC) circuits, Watts and VA are identical. However, in alternating current (AC) circuits, they differ due to the "Power Factor." Generators and UPS systems are often rated in VA because they must handle both the true power (Watts) and the reactive power of the circuit.
HVAC Ratings (BTU & Tons)
Air conditioners are typically rated in BTUs per hour or "Tons." One Ton of refrigeration is equivalent to the power required to melt one short ton of ice in 24 hours. 1 Ton = 12,000 BTU/hr = 3.517 Kilowatts.
Quick Reference: Appliance Power Draw
| Appliance / Machine | Average Wattage | Equivalent Power |
|---|---|---|
| LED Light Bulb | 10 W | 0.01 kW |
| Standard Microwave | 1,000 W | 1.0 kW / ~1.3 HP |
| Central Air Conditioner | 3,500 W | ~12,000 BTU/hr (1 Ton) |
| Electric Vehicle (Tesla Model 3 Motor) | 210,000 W | 210 kW / 281 HP |