PC requirements

Terraria System Requirements

Terraria needs at least 2.0 Ghz, 2.5GB of RAM and 128mb Video Memory, capable of Shader Model 2.0+ graphics. For the recommended experience you want Dual Core 3.0 Ghz, 4GB of RAM and 256mb Video Memory, capable of Shader Model 2.0+ graphics.

Verified Sources: Steam store listing
Terraria minimum and recommended PC specifications
Component Minimum Recommended
Processor 2.0 Ghz Dual Core 3.0 Ghz
Memory 2.5GB 4GB
Graphics 128mb Video Memory, capable of Shader Model 2.0+ 256mb Video Memory, capable of Shader Model 2.0+
Storage 200MB 200MB
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

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

Quick answers

Running Terraria on PC

Can my PC run Terraria?
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 Terraria need?
200MB
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.