Factorio Ratios Calculator
Precision manufacturing ratios for the ultimate factory automation
10.00
Items/sec per Machine
Actual Cycle Duration
Yellow Belts Required
Throughput vs. Machines Scaling
Visual representation of machine count relative to target throughput tiers.
| Metric | Value | Description |
|---|
What is a Factorio Ratios Calculator?
A factorio ratios calculator is an essential tool for players of the hit automation game Factorio. In the world of Nauvis, efficiency is everything. This tool allows players to determine exactly how many assembling machines, chemical plants, or furnaces are required to saturate a transport belt or meet a specific production goal. Without a factorio ratios calculator, players often face bottlenecks where one part of the factory is idle while another is overwhelmed.
Who should use this? Everyone from “spaghetti factory” beginners to mega-base engineers. Misconceptions often arise regarding crafting speed; many assume a machine with speed 0.5 produces items at half the recipe time, but the math is slightly more complex when modules and beacons are introduced.
Factorio Ratios Calculator Formula and Mathematical Explanation
The math behind Factorio ratios involves three main variables: the base recipe time, the machine’s crafting speed, and the quantity of items produced per cycle. To find the true output of a single machine, we use the following derivation:
- Effective Crafting Speed = Machine Base Speed × (1 + Speed Bonus / 100)
- Actual Crafting Duration = Recipe Time / Effective Crafting Speed
- Output per Second = Items Produced / Actual Crafting Duration
- Total Machines Needed = Target Throughput / Output per Second
| Variable | Meaning | Unit | Typical Range |
|---|---|---|---|
| Recipe Time | Base time to craft one set of items | Seconds | 0.5s – 60s |
| Crafting Speed | Speed of the assembly machine | Multiplier | 0.5 – 1.25 |
| Target Rate | Desired output items per second | Items/sec | 15 – 2700 |
| Speed Bonus | Modifiers from speed modules | Percentage | 0% – 500%+ |
Practical Examples (Real-World Use Cases)
Example 1: Electronic Circuit (Green Chips)
Imagine you want to fill a single Yellow Belt (15 items/sec) with Electronic Circuits. The recipe takes 0.5s and produces 1 item. Using Assembling Machine 2 (Speed 0.75):
- Input: Recipe 0.5s, Output 1, Machine Speed 0.75, Target 15 items/sec.
- Calculation: One machine produces 1 / (0.5 / 0.75) = 1.5 items/sec.
- Result: 15 / 1.5 = 10 Machines required.
Example 2: Iron Plates Smelting
To saturate a Red Belt (30 items/sec) with Iron Plates using Steel Furnaces (Speed 2.0). The recipe for Iron Plates is 3.2s for 1 plate.
- Input: Recipe 3.2s, Output 1, Machine Speed 2.0, Target 30 items/sec.
- Calculation: One furnace produces 1 / (3.2 / 2.0) = 0.625 items/sec.
- Result: 30 / 0.625 = 48 Furnaces required.
How to Use This Factorio Ratios Calculator
- Select the Recipe: Look at your in-game recipe and enter the base crafting time.
- Determine Output: Enter how many items are produced per craft (e.g., Copper Wire produces 2).
- Choose Machine: Select your current machine tier (Assembler 1, 2, or 3).
- Set Throughput: Decide if you want a full belt (15, 30, or 45 items/sec) or a specific amount.
- Add Bonuses: If you have Speed Modules or Beacons, enter the total percentage bonus.
- Analyze: The calculator will instantly tell you how many machines to build!
Key Factors That Affect Factorio Ratios Results
- Machine Tiers: Higher tier assemblers have higher base speeds, reducing the number of machines needed for the same throughput.
- Productivity Modules: These increase output per cycle but slow down crafting speed and increase energy costs.
- Beacon Coverage: Beacons allow you to transmit module effects to multiple machines, drastically increasing effective crafting speed.
- Belt Throughput: Your final machine count must align with the capacity of Yellow (15/s), Red (30/s), or Blue (45/s) belts.
- Inserter Capacity: Ensure your inserters can move items fast enough to keep up with the machine’s speed.
- Power Stability: If your factory loses power, machines slow down, throwing off your calculated ratios.
Frequently Asked Questions (FAQ)
Q: Why does my factory stall even if the ratios are correct?
A: Usually, this is due to “input starvation” (not enough raw materials) or “output clogging” (the belt is full and items can’t leave).
Q: How do Productivity Modules change the math?
A: They add a second progress bar. When it fills, you get a free item. This changes the ratio of inputs to outputs, effectively making your factory more efficient.
Q: What is the belt speed for a Blue Belt?
A: A Blue Belt moves 45 items per second, which is three times the speed of a Yellow Belt (15 items/sec).
Q: Do beacons stack?
A: Yes, if a machine is within the range of multiple beacons, the speed bonuses are additive.
Q: Can I use this for liquid recipes?
A: Yes, the math for Chemical Plants and Oil Refineries works exactly the same as assembling machines.
Q: What is ‘Crafting Speed’ 1.0?
A: A crafting speed of 1.0 means the machine crafts exactly at the speed listed in the recipe (e.g., a 0.5s recipe takes 0.5s).
Q: Why use a factorio ratios calculator for smelting?
A: Smelting arrays are the foundation of your factory. Knowing exactly how many furnaces saturate a belt prevents wasted space and resources.
Q: Does machine orientation affect ratios?
A: No, but the way you build your belts and inserters will affect the “effective” throughput if they can’t clear the machines fast enough.
Related Tools and Internal Resources
- Power Grid Calculator: Balance your solar and steam engine ratios for a stable base.
- Logistic Robot Efficiency Tool: Calculate how many robots you need for your logistics network.
- Smelting Ratio Guide: Deep dive into iron, copper, and steel smelting setups.
- Nuclear Ratio Calc: Perfect the 1-2-4 ratio for nuclear reactors and turbines.
- Train Throughput Tool: Optimize train schedules and station counts.
- Oil Processing Optimizer: Solve the complex ratios of heavy, light, and petroleum gas.