An Autohotkey script for Windows that lets you emulate a numeric keypad (numpad) on a keyboard that doesn't have it. Both NumLock modes are usable.

Extract CapslockNumpad.exe to anywhere on your computer and run it. The executable does not write anything to your computer.

Press Ctrl + CapsLock to toggle the numpad on and off. Press \ (above the Enter key) to toggle NumLock.

The source code is in CapsLock_Numpad.ahk if you want to edit the script, but it will not have the nice icons.

The tray icon for CapslockNumpad changes colour to indicate the state of the numpad (grey for disabled, blue for enabled). I recommend setting this icon to always be visible in the tray (in Windows 10: Right-click the taskbar → Taskbar settings → Notification area → Select with icons appear on the taskbar). The state of NumLock is in the hover tooltip of the tray icon.

• Keyboard layout diagram from http://www.keyboard-layout-editor.com
• Base code from /u/GroggyOtter