Satisfactory Coal Generator Calculator

Plan your perfect coal power setup for maximum efficiency and stability.

What is a Satisfactory Coal Generator Calculator?

A satisfactory coal generator calculator is a specialized tool for players of the factory-building game, Satisfactory. It helps you plan and optimize your first major automated power source: coal power. The calculator determines the precise ratios of Coal Generators, Water Extractors, and Miners required to create a stable, self-sustaining power grid. By inputting your desired number of generators and your available resource technology (miners, belts), the tool outputs the exact resource requirements, preventing power outages caused by fuel or water shortages. It’s an essential utility for moving beyond early-game biomass burners and into large-scale factory production.

Coal Power Formula and Explanation

The core of any successful coal power setup in Satisfactory revolves around a few key ratios. At 100% clock speed, the machines have fixed consumption and production rates. This calculator uses these fundamental values to determine your factory’s needs.

• Power Output: 1 Coal Generator = 75 MW
• Coal Consumption: 1 Coal Generator = 15 Coal/min
• Water Consumption: 1 Coal Generator = 45 m³/min
• Water Production: 1 Water Extractor = 120 m³/min

The famous “perfect ratio” for beginners is 8 Coal Generators : 3 Water Extractors. This setup requires 120 Coal/min. Let’s see why:

8 Generators * 45 Water/min = 360 Water/min needed

3 Extractors * 120 Water/min = 360 Water/min supplied

This setup maximizes the capacity of a Mk.1 pipe (300 m³/min) by splitting the water supply or using clever piping, and perfectly matches the output of a Mk.1 Miner on a Pure Coal Node (120/min), which can be transported with a Mk.2 conveyor belt. Our satisfactory coal generator calculator handles all this math for you.

Variables Table

Key variables in coal power calculations.

Variable	Meaning	Unit	Typical Range
Power	The electrical energy produced.	Megawatts (MW)	75 – 7,500+
Coal Rate	The amount of coal consumed or supplied.	items/min	15 – 780
Water Rate	The amount of water consumed or supplied.	m³/min	45 – 600+
Node Purity	The quality of the resource node.	Impure, Normal, Pure	N/A

Practical Examples

Example 1: The Standard Starter Plant

You want to build your first reliable coal plant to get off biomass for good.

• Inputs:
  • Number of Coal Generators: 8
  • Miner Mark: Mk.1
  • Node Purity: Pure
  • Belt Mark: Mk.2 (120/min)
• Results from the Calculator:
  • Total Power: 600 MW
  • Coal Required: 120/min
  • Water Required: 360 m³/min
  • Water Extractors Needed: 3
  • Status: Perfectly Balanced. A Mk.1 miner on a pure node provides exactly 120 coal/min, which your Mk.2 belt can handle. 3 Water Extractors provide exactly the 360 m³/min of water needed.

For more advanced setups, check out a satisfactory production planner.

Example 2: Upgrading an Existing Node

You have a Normal coal node and just unlocked the Mk.2 Miner. You want to see how many generators you can support.

• Inputs:
  • Number of Coal Generators: 16
  • Miner Mark: Mk.2
  • Node Purity: Normal
  • Belt Mark: Mk.3 (270/min)
• Results from the Calculator:
  • Total Power: 1200 MW
  • Coal Required: 240/min
  • Water Required: 720 m³/min
  • Water Extractors Needed: 6
  • Status: Perfectly Balanced. A single Mk.2 miner on a normal node provides 120/min. To get 240/min, you would need to either overclock one miner to 200% or use two Mk.2 miners. Your Mk.3 belt has enough capacity.

How to Use This Satisfactory Coal Generator Calculator

1. Enter Generator Count: Start by entering the total number of Coal Generators you wish to build. A good starting point is 8.
2. Select Mining Equipment: Choose the Miner Mark (Mk.1, Mk.2, or Mk.3) you will use and the Purity (Impure, Normal, Pure) of the coal node it will sit on. This determines your maximum potential coal supply.
3. Choose Your Belt Speed: Select the Conveyor Belt Mark you will use to transport the coal. This is crucial; if your belt is too slow, it will bottleneck your entire system.
4. Analyze the Results: The calculator will instantly show you the total power output, the required coal and water per minute, and the exact number of Water Extractors needed (at 100% clock speed).
5. Check the Status: The status message and bar chart will tell you if your setup is balanced. It compares the coal your mining setup can provide versus what your generators need. If it shows a “Coal Deficit,” you need to upgrade your miner or belts. If it shows a “Surplus,” you have room to add more generators!

A solid power grid is the first step. Next, you might want to explore a guide to nuclear power for late-game energy needs.

Key Factors That Affect Coal Power

1. Pipe Throughput

A Mk.1 Pipeline can only carry a maximum of 300 m³/min of fluid. Since 8 generators need 360 m³/min, you cannot simply connect 3 extractors to one long pipe. You must either have two separate pipe networks or connect a pipe in the middle of your generator line to feed it from both sides.

2. Head Lift

Water Extractors and Pipeline Pumps can only push water up to a certain vertical height (10m for extractors, 20m for pumps). If your generators are higher than your extractors, you will need pumps to move the water uphill.

3. Miner Clock Speed

Overclocking or underclocking your miners is a powerful way to perfectly match the coal demand of your generators. This satisfactory coal generator calculator assumes 100% clock speed, but you can use Power Shards to get more resources from a single node.

4. Belt Speed Bottlenecks

A common mistake is using a belt that can’t handle the miner’s output. A Mk.1 Miner on a Pure node produces 120 coal/min, but a Mk.1 Belt can only move 60 items/min. Always ensure your belt speed is equal to or greater than your miner’s output.

5. Initial Startup (Kick-starting)

Coal Generators, Miners, and Water Extractors all require power to run. To start a coal plant from scratch, you need a separate power source (like a few Biomass Burners) to power the extractors and miners first. Once they fill the generators with water and coal, the generators will fire up and can then power themselves and the rest of your factory.

6. Fuel Type

While this calculator focuses on Coal, generators can also burn Compacted Coal or Petroleum Coke, which have different burn times and energy values. This can change the required item-per-minute rate. For advanced fuel setups, you might need a Satisfactory ratio calculator.

Frequently Asked Questions (FAQ)

How many coal generators for one pure node?

A pure coal node with a Mk.1 Miner produces 120 coal/min. Since one generator needs 15 coal/min, you can support exactly 8 coal generators (120 / 15 = 8). You’ll need a Mk.2 belt to transport all the coal.

How many water extractors for 8 coal generators?

You need 3 water extractors. Each generator needs 45 m³/min of water, so 8 generators need 360 m³/min (8 * 45). Three water extractors produce exactly that amount (3 * 120 = 360).

Why did my coal power plant shut down?

The most common reasons are either a water shortage or a coal shortage. Use this calculator to check your ratios. Another likely culprit is pipe throughput; ensure a single pipe isn’t being asked to carry more than 300 m³/min. Finally, check your head lift if the water source is below the generators.

Is it better to overclock miners or build more?

From a power efficiency standpoint, it is almost always better to build more miners at 100% clock speed. Overclocking has a non-linear power cost, meaning a 200% overclock costs more than double the power. However, overclocking is great for saving space or when you only have one node available. Learn more in our overclocking efficiency guide.

What does “unitless” or “relative” mean for this calculator?

In this context, it means the core inputs (like “Number of Coal Generators”) are simple counts. The calculator then uses these counts to derive outputs in specific, fixed units like MW, items/min, and m³/min, which are standard in the game Satisfactory.

Can I use a Mk.1 pipe for 8 generators?

Yes, but not as a single, long line. A Mk.1 pipe is limited to 300 m³/min. Since 8 generators need 360 m³/min, you must feed your generator manifold from two ends or from the middle to avoid starving the generators at the end of the line.

How do I handle the initial power-up?

You need to “kick-start” the system. Build your coal plant, but don’t connect it to your main factory grid yet. Instead, connect just the Water Extractors and Coal Miners to a few Biomass Burners. Let the system run until the conveyor belts are full of coal and the generator water buffers are full. Then, connect the Coal Generators to the grid and disconnect the Biomass Burners.

What’s the next step after coal power?

After establishing a robust coal power infrastructure, the next major power upgrade is typically Fuel Generators, which run on fuel derived from Crude Oil. After that comes the ultimate late-game power source: Nuclear Power. Each step offers significantly more power per building. Our power progression guide covers this journey.

Related Tools and Internal Resources

Here are some other helpful resources to expand and optimize your factory:

• Production Planner: Plan entire production lines from raw resources to complex parts.
• Nuclear Power Guide: A deep dive into setting up your first nuclear reactor.
• Advanced Ratio Calculator: For complex recipes and alternative production lines.
• Overclocking & Underclocking Guide: Master power shards to perfect your factory’s efficiency.