# Power Conversion Calculator

> Convert power between watts, horsepower, BTU per hour, and foot-pounds per second.

Page: https://askcalculators.com/calculator/power-conversion-calculator/
Definition: https://askcalculators.com/calculator/power-conversion-calculator/definition.json
JSON Schema: https://askcalculators.com/calculator/power-conversion-calculator/schema.json
Version: 1.0.0
Maintained by: AskCalculators (software project; not a credentialed reviewer)
Qualified review: pending. Automated checks do not establish professional approval.
Page status: Live
Review status: Pending

## Use
Open the calculator page and enter values. Query-string parameters can restore and bookmark a calculation.
Example: https://askcalculators.com/calculator/power-conversion-calculator/?value=1&fromUnit=hp&toUnit=kW

## Inputs
- value: Power; type=number; required; default=1
- fromUnit: From unit; type=select; required; default=hp; values=W|kW|MW|hp|hpMetric|BTUh|ftlbs
- toUnit: To unit; type=select; required; default=kW; values=W|kW|MW|hp|hpMetric|BTUh|ftlbs

## Outputs
- result: Converted power; format=number; primary
- watts: Equivalent watts; format=number

## Formula
watts = value × watts-per-source-unit; result = watts ÷ watts-per-target-unit

## Rules
- Empty optional inputs are undefined, not zero.
- Hidden conditional inputs are ignored.
- Do not invent missing required inputs.