Pentium-compatible PC (Pentium IV, Athlon or more-recent system recommended);
512 MB RAM (1024 MB RAM recommended);
Up to 5GB available hard disk space;
Screen resolution of 1024x768 works but, 1280x1024 or higher is recommended, with at least 16K colors (with 1024x768 some buttons may result hidden but corresponding commands should be reachable via menu anyway).
Graphic card with at least OpenGL 2.1, with hardware shaders. Check the OpenGL specs of the card:
Intel: no cards that came before the HD-Graphics series, regardless of the name including "HD". Intel cards that are reported working starts from model HD2000 and higher.
NVIDIA: from NVIDIA support page: http://www.nvidia.com/object/nv_ogl2_support.html NVIDIA support for OpenGL 2.0 begins with the Release 75 series of drivers. GeForce FX (NV3x), GeForce 6 Series (NV4x), NV3xGL-based Quadro FX and NV4xGL-based Quadro FX GPUs, and all future NVIDIA GPUs support OpenGL 2.0.
AMD/ATI: should work any modern Radeon GPU, but check for some issues here: http://kicad-pcb.org/help/known-system-related-issues/#_bad_graphics_cards
See: http://kicad-pcb.org/help/known-system-related-issues/ for software specific issues.
The software and hardware prerequisites for installing KiCad on a Windows system are as follows:
Vista, Windows Server 2008, Windows 7, Windows 8, Windows Server 2012, or Windows 10;
The software and hardware prerequisites for installing on a Apple macOS computer are as follows:
Mac OS X 10.11 (El Capitan) or higher;
The software and hardware prerequisites for installing on Linux are as follows:
Any modern Linux distro with OpenGl 2.0 or higher support should work fine. For example Ubuntu 16.04 or higher.
Other systems (notably Unix *BSD) may be fully functional but are not officially supported.