Potência Motor
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
About this calculator
This motor power calculator is a useful tool for construction and electrical professionals. It allows calculating motor power based on variables voltage, current and power factor.
The formula used to calculate power is P = V·I·cosφ·η, where V is voltage, I is current, cosφ is power factor and η is motor efficiency. This formula is applied to three-phase motors.
Calculated power can be used to size motor capacity in construction projects, ensuring they can handle energy demands required. Additionally, the calculator can help avoid overloading and safety issues.
It is worth noting that motor power can vary depending on operational conditions and equipment efficiency used. Therefore, it's essential to consider these factors when using this calculator.
Frequently asked questions
What is the power factor (cosφ) and how does it affect the calculated power?
The power factor is the ratio between active power and total power consumed by the motor. A lower power factor can lead to a lower calculated power.
When should I use this calculator?
You should use this calculator when you need to calculate the power of three-phase electric motors in construction projects or in electrical energy systems.
How can I ensure the accuracy of the calculated power?
To ensure accuracy, provide exact values for voltage, current and power factor, and consider the motor efficiency.
Can I use this calculator for single-phase motors?
No, this calculator is designed for three-phase motors. For single-phase motors, a different formula is needed.