Power Unit Converter

The power unit converter switches a value between 30 power units across electrical, mechanical, and thermal engineering: watts, kilowatts, megawatts, horsepower variants, BTU-based thermal power, volt-amperes, decibel-milliwatts, and specialized units such as ton of refrigeration and Planck power.

• Values accept whole numbers (750), decimals (1.5), fractions (3/4), mixed numbers (2 1/2 or 2-1/2), and scientific notation (1.5e3).
• Most units convert by a fixed factor relative to the watt; decibel-milliwatt is the exception, converting through a base-10 logarithmic formula rather than a linear ratio.
• A swap control reverses the source and target units without re-selecting either one.
• Settings holds the display precision, from 2 to 10 decimal places, and an optional step-by-step view that shows the conversion factor and the substituted arithmetic.

A ton of refrigeration is defined as exactly 12,000 BTU per hour, the cooling rate needed to freeze one short ton of ice within 24 hours, so an air conditioner rated at 12,000 BTU/hr is a 1-ton unit. Comparing motor ratings across the metric and imperial systems works the same way: a 15 kilowatt motor comes to about 20.4 metric horsepower, since 1 metric horsepower equals 735.49875 watts and 15,000 / 735.49875 = 20.39.

Power conversion is essential across electrical engineering, HVAC design, automotive performance analysis, and renewable energy planning. This converter consolidates all major power units into a single interface, removing the need for separate tools or manual formula lookups.

• Electrical Engineering: Convert between watts, kilowatts, and volt-amperes when sizing transformers, circuit breakers, or power distribution panels. 5,000 VA is 5 kW at unity power factor, the load figure used when sizing transformers and circuit breakers from a nameplate rating.
• HVAC Design: Convert BTU per hour to watts or tons of refrigeration when specifying air conditioning equipment. 12,000 BTU per hour equals 1 ton of refrigeration, the standard unit for sizing residential air conditioning capacity.
• Automotive: Convert between mechanical horsepower and kilowatts when comparing engine specifications across markets. European vehicles typically list power in kilowatts while North American listings use horsepower.
• Renewable Energy: Convert solar panel output from watts to kilowatts or megawatts when designing photovoltaic arrays. A photovoltaic array's total rated output in kilowatts or megawatts is the sum of the individual panels' watt ratings converted to the system-level unit, the figure grid connection applications require.
• Industrial Manufacturing: Convert motor nameplate ratings between metric horsepower and kilowatts when sourcing equipment from international suppliers. Verify that a 15 kW motor matches the required 20.4 metric horsepower specification.
• Physics Education: Convert between fundamental units like watts, ergs per second, and foot-pounds per second to reinforce understanding of energy transfer rates. The conversion factor derivation is available in a step-by-step formula view, useful for reinforcing how the units relate to each other.
• Data Center Management: Convert server rack power consumption from watts to kilowatts and BTU per hour to calculate cooling requirements. Server rack power consumption converts from watts to kilowatts and to BTU per hour, the units used for sizing data center HVAC load.
• Construction: Convert generator output ratings between kilowatts and kilovolt-amperes when selecting portable or standby power equipment for job sites. Account for power factor differences between apparent and real power.
• Audio Engineering: Convert amplifier output from watts to decibel-milliwatts when analyzing signal power levels in audio equipment chains. 50 watts of amplifier output is about 47 dBm on the logarithmic dBm scale referenced to 1 milliwatt, a figure used in system gain staging.