VO2 Max Calculator

A tiny app that estimates VO₂ max from your age and resting heart rate (RHR). This repository includes a Tkinter GUI and packaging helpers so you can download a single-file Windows executable (.exe) and run the app by double-clicking.

Files added:

• VO2Maxcalc.py — Tkinter GUI application (entrypoint)
• requirements.txt — build dependency (PyInstaller)
• build_exe.bat — convenient Windows build script (uses PyInstaller)
• build_exe.sh — build script for other OSes (note: building a Windows .exe requires Windows)
• .github/workflows/build-windows.yml — GitHub Actions workflow to build the Windows exe and upload it as an artifact

Quick start (downloaded exe):

1. Go to the GitHub repository's Actions tab and open the latest Build Windows executable run.
2. Download the artifact VO2Maxcalc-windows.
3. Unzip and double-click VO2Maxcalc.exe — the GUI will open.

Build locally on Windows (produces a double-clickable exe):

1. Install Python 3.8+ for Windows (include Tcl/Tk).
2. Open a Command Prompt in this repo and run:

build_exe.bat

The resulting dist\VO2Maxcalc.exe can be distributed as a single file.

Build on Linux/macOS (creates native binary for that OS):

./build_exe.sh

Notes:

• PyInstaller must be run on the target OS to create a native executable for that OS (you cannot make a Windows .exe from Linux using PyInstaller unless using Wine).
• tkinter is included with the standard Python installer on Windows; no extra packages are required at runtime.

Usage:

1. Run the app (double-click the exe or run python VO2Maxcalc.py).
2. Enter your age and resting heart rate.
3. Click "Calculate VO₂ Max" and the estimated result will be shown.

If you'd like, I can also:

• Add icons and version metadata for the Windows exe.
• Create a small installer (Inno Setup) to package the exe with a shortcut.
• Publish a prebuilt release and attach the exe on GitHub releases.