📐 Factorio Production Ratios Guide
The beauty of Factorio is that everything can be calculated exactly. No RNG, no guesswork — just math. Here are the essential ratios you need.
🔢 Basic Ratios Reference
Power Generation
| Setup | Ratio | Notes |
|---|---|---|
| Steam | 1 Offshore Pump : 20 Boilers : 40 Steam Engines | Max 60 MW per offshore pump |
| Nuclear | 1 Reactor : 4 Heat Exchangers : 7 Steam Turbines | +100% neighbor bonus per adjacent reactor |
| Solar | 0.84 Accumulators per Solar Panel | For 24h continuous power |
Smelting
| Input | Output | Electric Furnace | Steel Furnace |
|---|---|---|---|
| Iron Ore → Iron Plate | 1 per 3.2s | 1 furnace : 48 ore/min | 1 furnace : 31.5 ore/min |
| Copper Ore → Copper Plate | 1 per 3.2s | Same as iron | Same as iron |
| Iron Plate → Steel | 1 per 16s | 5 iron furnaces : 1 steel furnace | 5 iron : 1 steel |
Green Circuits
Assembly Machine 2: 3 Copper Wire : 2 Green Circuit — 1 copper wire assembler feeds 1.5 green circuit assemblers
Red Circuits
Assembly Machine 3 with Speed Module 1:
4 Plastic : 4 Copper Wire : 1 Green Circuit → 2 Red Circuits
📊 Science Per Minute (SPM) Design Targets
Target figures per 100 SPM with Assembler 3 + Speed 3 in all buildings:
| Science | Input/min | Building Count | Key Resource/min |
|---|---|---|---|
| 🟥 Automation | 100 | 1 AM3 + 1 Gear AM3 | 200 Iron |
| 🟩 Logistic | 100 | 2 AM3 (inserters+belts) | 150 Iron + 40 Copper |
| 🟦 Military | 100 | 2 AM3 | 250 Iron + 50 Copper |
| ⚗️ Chemical | 100 | 3 AM3 | 300 Oil + 200 Iron |
| 🟪 Production | 100 | 2 AM3 + 2 Electric Furnace | 400 Iron + 300 Copper |
| 🟨 Utility | 100 | 3 AM3 | 250 Copper + 100 Plastic |
| 🔵 Space | 100 | 3 AM3 + Rocket Silo | 500 Copper + 300 Steel |
💡 Rule of thumb: 100 SPM = ~1 full red belt of iron + ~1 full red belt of copper.
🏗️ Belt Throughput
| Belt Type | Items/min (single lane) | Items/min (both lanes) | Upgrade cost |
|---|---|---|---|
| Yellow | 900 | 1,800 | Starting belt |
| Red | 1,800 | 3,600 | 1 Iron gear + 4 plates |
| Blue | 2,700 | 5,400 | 1 Lubricant + 5 Iron gear + 10 plates |
⚡ Module Efficiency
| Module | Speed | Productivity | Energy | Best Used For |
|---|---|---|---|---|
| Speed 3 | +50% | — | +70% | Miners, Pumps — more output from same patch |
| Productivity 3 | -15% | +10% | +80% | Assemblers, Refineries — free items (must use Speed on beacons) |
| Efficiency 3 | — | — | -80% | Early power-limited bases, biters near pollution |
Pro tip: A single Speed 3 beacon (+50% to 8 surrounding buildings) is more UPS-efficient than Speed 3 in each building. Use 8-beacon or 12-beacon layouts for megabases.
🚛 Logistics Bot Ratios
| Bot Type | Speed | Capacity | Cargo/min (2 roboports) |
|---|---|---|---|
| Logistic | 3 tiles/s | 3 items | ~540 |
| Construction | 3.6 tiles/s | 4 items | ~864 |
| Logistic 2 (follower) | 5.5 tiles/s | 4 items | ~1,320 |
| Logistic 3 | 7.8 tiles/s | 5 items | ~2,340 |
Roboport coverage: 50×50 tiles logistic, 110×110 tiles construction.
Network recommendation: Max 1-2 roboports wide for high-throughput lines.
📍 Blueprint References
| Blueprint | Link |
|---|---|
| 8-beacon Green Circuit (1000+/min) | factorioprints.com |
| 1-4 Train Station | factorioprints.com |
| 1M+ SPM Megabase Starter | factorioprints.com |
Ratings verified against Factorio 2.0 and official Wiki. Module ratios are for Quality 1 modules.