PC requirements

Kerbal Space Program System Requirements

Kerbal Space Program needs at least Core 2 Duo 2.0 Ghz, 4 GB RAM and DX10 (SM 4.0) capable, 512MB VRAM graphics. For the recommended experience you want Core i5, 8 GB RAM and DX10 (SM 4.0) capable, 1GB VRAM graphics.

Verified Sources: Steam store listing
Kerbal Space Program minimum and recommended PC specifications
Component Minimum Recommended
Operating system Windows 7 SP1+ Windows 10 64-bit
Processor Core 2 Duo 2.0 Ghz Core i5
Memory 4 GB RAM 8 GB RAM
Graphics DX10 (SM 4.0) capable, 512MB VRAM DX10 (SM 4.0) capable, 1GB VRAM
Storage 3 GB HD space 4 GB HD 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.

Other platforms

Kerbal Space Program is also available on these systems, where hardware is fixed and no per-PC check is needed:

Quick answers

Running Kerbal Space Program on PC

Can my PC run Kerbal Space Program?
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 Kerbal Space Program need?
3 GB HD space
What is the difference between minimum and recommended specs?
Minimum means the game starts and is playable, usually at 30fps on low settings at 1080p. Recommended is the developer's target for a smooth 60fps experience at high settings.