Modern electrical power calculator built with Python + Flet for fast and reliable calculations in single-phase and three-phase systems.

⚡ Active Power (P) ⚡ Apparent Power (S) ⚡ Reactive Power (Q)

🔄 1-phase / 2-phase / 3-phase selection

✅ Automatic voltage validation ✅ Power factor validation 🌙 Modern dark UI 💻 Desktop build (Windows) 📱 Android APK build support 📐 Calculation Logic 1-phase S = U × I P = S × cosφ Q = S × sinφ 3-phase S = √3 × U × I P = S × cosφ Q = S × sinφ 

Where:

U = voltage (V) I = current (A) cosφ = power factor sinφ = √(1 - cos²φ) 

🧠 Input Validation

Power factor range: 0.1 – 1 Voltage range depends on selected phase Invalid values fallback to safe defaults Voltage auto-adjusts when switching phase mode Results rounded for clean display

Python 3.13 Flet 0.80.5 (1.0b) Flutter engine (via Flet build system)

▶️ Run Locally

Install dependencies: pip install flet Run the app: python Power.py

Or using Flet CLI: flet run Power.py

📦 Build

Windows flet build windows

Android APK flet build apk --module-name Power

Parameter Default Current 16 A Voltage (1-phase)	230 V Voltage (2,3-phase)	400 V Power Factor 0.98 

Power_Calculator/ │ ├── Power.py # Main Flet UI application ├── logic.py # Electrical calculation logic ├── images/ │ └── Power_calc_flet.png ├── assets/ │ └── icon.png ├── README.md └── LICENSE 

This project is licensed under the MIT License.

MIT License

Copyright (c) 2026 Igor Vitovský

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Igor Vitovský GitHub: https://github.com/igvisk