MISUMI USA’s electrical motor calculators help you figure out current draw, horsepower, and apparent power for your motors. Whether you’re working with single-phase or three-phase systems, you can quickly calculate what you need for motor sizing and electrical loads. Useful for anyone doing electrical work or motor installations.
The below tool shows you both RLA (running load amps) and FLA (full load amps) since you’ll need both numbers depending on what you’re sizing – breakers, wire, or other electrical components. It’s especially handy when you’re working with motor specifications that don’t list the current draw, or when you need to verify what’s on a nameplate. Works for any motor size and voltage, so whether you’re dealing with a small 1 HP motor or something much larger, you can get the current calculations you need.
Electrical Motor Current Calculator
The below calculator works backwards from current draw to determine actual motor power output. Enter the measured current, efficiency, and power factor to get the real horsepower and kilowatt output for single-phase and three-phase motors. Useful for troubleshooting motors, verifying nameplate ratings, or sizing replacements when you can measure current but need to know the actual power being delivered.
Calculate Power (horsepower)
Calculated Motor Power
The below calculator determines the apparent power (kVA) that a three-phase motor draws from the electrical system. Input the motor's horsepower, efficiency, and power factor to get the total kVA demand. This is essential for sizing transformers, generators, and electrical service since apparent power represents the actual load on your electrical system, not just the useful work output of the motor.
Calculate 3 Phase Apparent Power (kVA)
MISUMI USA carries several options of general purpose motors, including three phase fractional motors, and single phase fractional motors. We also have wide variety of AC servo motors, brushless motor, and much more for you project and engineering needs. Please feel free to reach out to our product specialists with any questions you might have in regards to electric motors and your project requirements/measurements - also, be sure to check out our Electric Motor Amp Chart page.
Author: Scott Bredemann | Updated: 5/27/2025
Disclaimer
The content on this webpage is for informational purposes only. MISUMI makes no guarantees, expressed or implied, regarding the accuracy, completeness, or validity of the information. Performance parameters, tolerances, designs, materials, or processes should not be assumed to reflect third-party suppliers’ or manufacturers’ deliverables within MISUMI’s network. Buyers are responsible for specifying their part requirements