Power Converter
Instantly convert power with our free converter. See conversion tables, formulas, and step-by-step explanations. Includes formulas and worked examples.
Formula
Converted = Input x (From Unit in Watts) / (To Unit in Watts)
All power units are converted through watts as the base unit. Multiply the input value by its conversion factor to watts, then divide by the target unit factor. For example, 1 horsepower = 745.7 watts, 1 kilowatt = 1000 watts, 1 BTU/h = 0.293 watts.
Worked Examples
Example 1: Engine Power Conversion
Problem: A car engine produces 250 horsepower. Convert to kilowatts and watts.
Solution: Watts = 250 x 745.7 = 186,425 W\nKilowatts = 186,425 / 1000 = 186.425 kW\nMetric HP = 186,425 / 735.5 = 253.47 PS
Result: 250 hp = 186.425 kW = 186,425 W = 253.47 PS
Example 2: HVAC Power Rating
Problem: An air conditioner is rated at 12,000 BTU/h. What is its power in watts and kilowatts?
Solution: Watts = 12,000 x 0.29307 = 3,516.85 W\nKilowatts = 3,516.85 / 1000 = 3.517 kW\nHorsepower = 3,516.85 / 745.7 = 4.716 hp
Result: 12,000 BTU/h = 3,516.85 W = 3.517 kW = 4.72 hp
Frequently Asked Questions
What is the relationship between power and energy?
Power is the rate at which energy is transferred or converted, measured in watts (joules per second). Energy is the total amount of work done over time, measured in joules or kilowatt-hours. A 100-watt light bulb consumes 100 joules of energy every second. Running that bulb for one hour uses 0.1 kilowatt-hours (kWh) of energy. Understanding this relationship is essential for calculating electricity costs: your utility bill charges for energy consumed (kWh), not instantaneous power (W).
Is my data stored or sent to a server?
No. All calculations run entirely in your browser using JavaScript. No data you enter is ever transmitted to any server or stored anywhere. Your inputs remain completely private.
What formula does Power Converter use?
The formula used is described in the Formula section on this page. It is based on widely accepted standards in the relevant field. If you need a specific reference or citation, the References section provides links to authoritative sources.
Can I share or bookmark my calculation?
You can bookmark the calculator page in your browser. Many calculators also display a shareable result summary you can copy. The page URL stays the same so returning to it will bring you back to the same tool.
Does Power Converter work offline?
Once the page is loaded, the calculation logic runs entirely in your browser. If you have already opened the page, most calculators will continue to work even if your internet connection is lost, since no server requests are needed for computation.
How do I interpret the result?
Results are displayed with a label and unit to help you understand the output. Many calculators include a short explanation or classification below the result (for example, a BMI category or risk level). Refer to the worked examples section on this page for real-world context.