Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

Electrical Motors - Horsepower vs. Voltage and Amps

Electrical motors horsepower rating vs. their ampere rating.

electric motor horsepower amps

Horsepower rating compared to electric motor ampere rating - 115 VAC and 230 VAC - are indicated below:

Electrical Motors - Horsepower, Voltage, Efficiency and Amps
Ampere Rating (amps)
Power Rating
115 VAC230 VAC
Efficiency (%)
1/4 3.2 2.3 1.6 1.2
1/3 4.3 3.1 2.2 1.5
1/2 6.5 4.6 3.2 2.3
3/4 9.7 7.0 4.9 3.5
1 13.0 9.3 6.5 4.6
1 1/2 19.5 13.9 9.7 7.0
2 25.9 18.5 13.0 9.3
5 64.9 46.3 32.4 23.2
  • 1 hp = 745.7 W

Note that an electric motor is an inductive load. With low power factor it pulls lot of amps producing little hp output. 

Related Topics

  • Electrical

    Electrical engineering with units, amps and electrical wiring. Wire gauges, electrical formulas, motors and more.

Related Documents


Search is the most efficient way to navigate the Engineering ToolBox.

Engineering ToolBox - SketchUp Extension - Online 3D modeling!

3D Engineering ToolBox Extension to SketchUp - add parametric components to your SketchUp model

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with older versions of the amazing SketchUp Make and the newer "up to date" SketchUp Pro . Add the Engineering ToolBox extension to your SketchUp Make/Pro from the Extension Warehouse !

Translate this Page

Translate this page to Your Own Language .

About the Engineering ToolBox!

Privacy Policy

We don't collect information from our users. More about

We use a third-party to provide monetization technologies for our site. You can review their privacy and cookie policy here.

You can change your privacy settings by clicking the following button: .


This page can be cited as

  • The Engineering ToolBox (2009). Electrical Motors - Horsepower vs. Voltage and Amps. [online] Available at: [Accessed Day Month Year].

Modify the access date according your visit.

3D Engineering ToolBox - draw and model technical applications! 2D Engineering ToolBox - create and share online diagram drawing templates! Engineering ToolBox Apps - mobile online and offline engineering applications!

Unit Converter