PC requirements

Half-Life 2 System Requirements

Half-Life 2 needs at least 1.7 Ghz, 512 MB RAM and DirectX 8.1 level Graphics Card (requires support for SSE) graphics.

Verified Sources: Steam store listing
Half-Life 2 minimum and recommended PC specifications
Component Minimum
Operating system Windows 7, Vista, XP
Processor 1.7 Ghz
Memory 512 MB RAM
Graphics DirectX 8.1 level Graphics Card (requires support for SSE)
Storage 6500 MB available space
Not sure how your PC compares? Use the Can I Run It checker — pick your CPU and GPU and it tells you which column you land in.
Playing on a handheld instead? Players report Half-Life 2 as Platinum on Steam Deck and Linux.

Other platforms

Half-Life 2 is also available on these systems, where hardware is fixed and no per-PC check is needed:

Quick answers

Running Half-Life 2 on PC

Can my PC run Half-Life 2?
Compare your CPU, GPU and RAM against the minimum column below. If your parts match or beat every minimum row, the game will launch — though you may need to lower settings. Matching the recommended column is what gets you 60fps at 1080p.
How much storage does Half-Life 2 need?
6500 MB available space