SPM Atlas

Data-verified guides and calculators for Factorio. Every number on this site comes from the game's own prototype definitions rather than from estimates or hearsay, and it is checked before it ships.

Calculators

Two interactive tools built from Factorio 2.1 game data:

• Production Ratio Calculator — set a target rate, get machine counts, raw input demand, belt load, and power draw
• Planet Production Planner — plan production chains across Space Age planets with local and imported splits

Production Ratios

Reference tables for the systems a Factorio base is built from: smelting, solar and accumulators, nuclear power, oil processing, science packs, and train throughput.

Guides

In-depth explanations covering how production ratios work, main bus design, starter base layouts, circuit networks, megabase scaling, and more. Browse all guides.

Quick Reference

Cheat sheet — a compact reference for the numbers you look up most often.