# Horsepower Calculator

> Determine an engine's mechanical horsepower by providing its torque output and rotational speed (RPM).

Page: https://askcalculators.com/calculator/horsepower-calculator/
Definition: https://askcalculators.com/calculator/horsepower-calculator/definition.json
JSON Schema: https://askcalculators.com/calculator/horsepower-calculator/schema.json
Version: 7.0.0
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/horsepower-calculator/?torque=300&rpm=5252

## Inputs
- torque: Torque (lb-ft); type=number; optional; default=300
- rpm: Rotational Speed (RPM); type=number; optional; default=5252

## Outputs
- result: Result; format=text; primary

## Formula
Horsepower = torque in pound-feet × RPM ÷ 5252.

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