Portable fission reactor — Factorio Production Calculator
Portable fission reactor is crafted in the assembling machine in 10 seconds, producing 1 per craft from 200 × Processing unit, 50 × Low density structure, 4 × Uranium fuel cell. At 60 per minute you need 20 assembling machines, and the chain behind it draws on 7 raw resources: petroleum gas, copper ore, iron ore, water, coal, depleted uranium fuel cell, uranium 235.
Production chain for 60 Portable fission reactor / minute
| Item | Per minute | Machines | Machine |
|---|---|---|---|
| Copper cable | 960,000 | 8,000 | Assembling machine |
| Copper plate | 540,000 | 28,800 | Furnace |
| Iron plate | 319,440 | 17,036.8 | Furnace |
| Electronic circuit | 288,000 | 4,800 | Assembling machine |
| Plastic bar | 63,000 | 525 | Chemical plant |
| Sulfuric acid | 60,000 | 20 | Chemical plant |
| Advanced circuit | 24,000 | 4,800 | Assembling machine |
| Processing unit | 12,000 | 4,000 | Assembling machine |
| Sulfur | 6,000 | 50 | Chemical plant |
| Steel plate | 6,000 | 1,600 | Furnace |
| Low density structure | 3,000 | 1,500 | Assembling machine |
| Uranium-238 | 456 | 152 | Centrifuge |
| Uranium fuel cell | 240 | 8 | Assembling machine |
| Portable fission reactor | 60 | 20 | Assembling machine |
Raw materials
| Resource | Per minute |
|---|---|
| Petroleum gas | 720,000 |
| Copper ore | 540,000 |
| Iron ore | 319,440 |
| Water | 210,000 |
| Coal | 31,500 |
| Depleted uranium fuel cell | 760 |
| Uranium 235 | 24 |
Machine counts are not rounded up. Add a little headroom in game — belt throughput and inserter speed usually mean you want 5-10% more than the exact number.
Portable fission reactor recipe
| Machine | Crafting time | Output | Ingredients |
|---|---|---|---|
| Assembling machine | 10 s | 1 | Processing unit × 200, Low density structure × 50, Uranium fuel cell × 4 |
What the whole chain needs
60 portable fission reactors per minute pulls in 13 intermediate products, and the whole tree comes to 71,312 machines across 4 machine types, fed by 7 raw resources. The table above already sums demand across every branch — if copper cable is used by two recipes, you see the total, not one of them.
Belt check: the busiest input here moves 720,000 per minute, which is 800 of a yellow belt's 900 per minute. Above 1.0 and you need a second belt (or a faster tier) before the machines themselves become the limit.
What uses portable fission reactor
1 base-game recipe consumes portable fission reactor, sorted by how much each one takes:
- Spidertron — 2 per craft
What portable fission reactor is made from
- Processing unit — 200 per craft
- Low density structure — 50 per craft
- Uranium fuel cell — 4 per craft
FAQ
How many assembling machines do I need for 60 portable fission reactors per minute?
20 assembling machines. One at standard speed produces 3 per minute, so 60 ÷ that number is the count. The calculator above rounds nothing — add 5-10% headroom for belt and inserter losses in a real factory.
How much raw ore does portable fission reactor take?
At 60/min the chain consumes 720,000 petroleum gas per minute, 540,000 copper ore per minute, 319,440 iron ore per minute and 4 more. Those numbers are the theoretical minimum — mining productivity research and productivity modules both reduce them.
Is portable fission reactor needed for science packs?
Not directly. It feeds Spidertron, and those in turn feed the science packs. Open the science pack page to see the demand that lands on this recipe.
Machine counts assume bare machines at standard speed. Recipe data comes from the game's own prototypes (PlayerCalc, Factorio 2.0 base game). Not affiliated with Wube Software.