Satisfactory Splitter Calculator

Optimize your factory's item throughput and distribution with this specialized Satisfactory splitter calculator.

Input Requirements & Output Distribution

Output Capacity vs. Input Rate

Splitter Configurations & Throughput

Splitter Configuration Data

Splitter Type	Inputs	Outputs	Max Input Rate (CPM)	Max Output Rate per Port (CPM)
Basic Splitter	3	3	180 (3*60)	60
3-Input, 2-Output	3	2	180 (3*60)	90
4-Input, 2-Output	4	2	240 (4*60)	120
4-Input, 3-Output	4	3	240 (4*60)	80
3-Input, 4-Output	3	4	180 (3*60)	45

Note: Max Input Rate assumes Mk.4 belts (60 CPM) feeding into the splitter. Max Output Rate per Port is limited by the selected output belt speed.

What is a Satisfactory Splitter Calculator?

A Satisfactory splitter calculator is a tool designed to help players of the factory-building game "Satisfactory" determine the optimal item distribution and throughput for their production lines. Satisfactory's complex logistics systems rely heavily on splitters and mergers to manage item flow between machines, conveyor belts, and storage. This calculator simplifies the process of understanding how many items a splitter can handle, how much it can output onto its connected belts, and what input rate is required to fully utilize its capacity.

Players of all levels, from beginners setting up their first few machines to veterans optimizing massive megabases, can benefit from using this tool. It helps prevent common logistical bottlenecks, ensures that downstream machines receive the exact items they need at the correct rate, and facilitates efficient power and resource management by avoiding over-provisioning or under-utilization of components.

Common misunderstandings often revolve around the limitations of belt speeds versus splitter capabilities, or how different splitter configurations (like modded ones) alter the distribution ratios. Understanding these nuances is key to building stable and scalable factories.

Satisfactory Splitter Calculator Formula and Explanation

The core of the Satisfactory splitter calculator revolves around a few key calculations based on the player's inputs:

Primary Formulas:

1. Required Input Rate per Port: This determines how many items per minute (CPM) each individual output port ideally receives to match the incoming total rate.
2. Total Output Capacity: This calculates the maximum theoretical items per minute that all output belts combined can carry.
3. Items per Minute Needed for Full Output: This helps identify the total input rate required from upstream production to fully saturate all the splitter's output belts.
4. Satisfactory Throughput Ratio: This provides a percentage indicating how efficiently the splitter's output capacity matches the incoming item rate. A ratio of 100% means the output is perfectly matched to the input.
The general formula used is:

Required Input Rate per Port = Input Item Rate / Number of Output Ports

Total Output Capacity = Selected Belt Speed (CPM) * Number of Output Ports

Items per Minute Needed for Full Output = Selected Belt Speed (CPM) * Number of Output Ports

Satisfactory Throughput Ratio = (Total Output Capacity / Input Item Rate) * 100%

Variables Table:

Calculator Variables and Units

Variable	Meaning	Unit	Typical Range / Options
Input Item Rate	The total number of items arriving at the splitter per minute.	Items per Minute (CPM)	0 – 3000+ (depending on belt tiers and number of inputs)
Number of Output Ports	How many conveyor belts the splitter distributes items onto.	Count	2, 3, or 4 (depending on splitter type)
Selected Belt Speed	The throughput capacity of the conveyor belts connected to the splitter's outputs.	Items per Minute (CPM)	15, 30, 45, 60, 120
Splitter Type	The specific configuration of the splitter (vanilla or modded).	Type	Basic Splitter, 3i-2o, 4i-2o, 4i-3o, 3i-4o
Required Input Rate per Port	The ideal item rate for each individual output belt.	Items per Minute (CPM)	Calculated
Total Output Capacity	The maximum combined throughput of all output belts.	Items per Minute (CPM)	Calculated
Items per Minute Needed	The total input rate required to max out all output belts.	Items per Minute (CPM)	Calculated
Satisfactory Throughput Ratio	Percentage comparison of output capacity vs. input rate.	%	Calculated

Practical Examples

Here are a couple of realistic scenarios demonstrating how to use the Satisfactory splitter calculator:

Example 1: Feeding a Constructor

You have a Constructor that requires 15 items per minute of Iron Rods. You want to ensure it gets exactly this amount without overflowing or starving.

• Input Item Rate: 15 CPM (from an earlier machine or mining node).
• Number of Output Ports: You use a standard 3-output splitter, but only connect one output to the Constructor. For calculation purposes, let's assume you're focused on feeding *one* line, so we'll calculate based on a single output's needs. Alternatively, if you have a single input feeding a 3-way split for 3 constructors, you'd input 15 CPM *per constructor*, totaling 45 CPM input. Let's use the latter: 45 CPM input for 3 Constructors.
• Splitter Type: Basic Splitter.
• Selected Belt Speed: You choose Mk.2 belts (30 CPM) for the outputs.

Calculation:

• Required Input Rate per Port: 45 CPM / 3 Ports = 15 CPM per port.
• Total Output Capacity: 30 CPM/belt * 3 belts = 90 CPM.
• Items per Minute Needed for Full Output: 90 CPM.
• Satisfactory Throughput Ratio: (90 CPM / 45 CPM) * 100% = 200% (Meaning output capacity far exceeds input).

Interpretation: The calculator shows that each of the three output lines needs 15 CPM. Since your Mk.2 belts can carry 30 CPM, they won't be maxed out, but the splitter will distribute the 45 CPM input evenly, giving each constructor exactly the 15 CPM it needs. The high ratio indicates ample capacity.

Example 2: Balancing a 4-Way Split

You have a high-throughput line producing 240 items per minute of Copper Wire and want to split it evenly across four assemblers, each needing 60 CPM.

• Input Item Rate: 240 CPM.
• Number of Output Ports: 4.
• Splitter Type: Basic Splitter (or a 4-input, 4-output modded splitter if available, but results are similar for even distribution).
• Selected Belt Speed: You choose Mk.4 belts (60 CPM).

Calculation:

• Required Input Rate per Port: 240 CPM / 4 Ports = 60 CPM per port.
• Total Output Capacity: 60 CPM/belt * 4 belts = 240 CPM.
• Items per Minute Needed for Full Output: 240 CPM.
• Satisfactory Throughput Ratio: (240 CPM / 240 CPM) * 100% = 100%.

Interpretation: The calculator confirms that with 240 CPM input and 4 output ports, each port ideally needs 60 CPM. Since you've chosen Mk.4 belts (also 60 CPM), this is a perfect match. The 100% throughput ratio indicates perfect utilization – the input rate exactly matches the maximum output capacity of the belts and splitter configuration.

Example 3: Using a Modded Splitter

You have 180 CPM of Caterium Ingots being produced and want to split it between two alternate recipes that require 90 CPM each.

• Input Item Rate: 180 CPM.
• Number of Output Ports: 2.
• Splitter Type: 3-Input, 2-Output Splitter (A common modded configuration).
• Selected Belt Speed: You choose Mk.3 belts (45 CPM) as a temporary measure.

Calculation:

• Required Input Rate per Port: 180 CPM / 2 Ports = 90 CPM per port.
• Total Output Capacity: 45 CPM/belt * 2 belts = 90 CPM.
• Items per Minute Needed for Full Output: 90 CPM.
• Satisfactory Throughput Ratio: (90 CPM / 180 CPM) * 100% = 50%.

Interpretation: While the *required* rate per port is 90 CPM, your Mk.3 belts can only handle 45 CPM each. The calculator shows the total output capacity is exactly 90 CPM, meaning the splitter *will* distribute the 180 CPM input, but it will immediately bottleneck at the belts. The 50% ratio highlights that the output belts are the limiting factor, only utilizing half the splitter's potential input capacity.

How to Use This Satisfactory Splitter Calculator

1. Determine Input Rate: First, figure out the total items per minute (CPM) you have coming into the splitter. This might be from a mining machine, a constructor, or a merger. Enter this value into the "Input Item Rate" field.
2. Select Splitter Configuration: Choose the type of splitter you are using from the "Splitter Type" dropdown. This includes standard vanilla splitters and common modded variations that offer different input/output ratios.
3. Set Output Belt Speed: Select the speed (in CPM) of the conveyor belts you are using for the splitter's outputs. This is crucial as belts often become the bottleneck. Common options are Mk.1 (15 CPM), Mk.2 (30 CPM), Mk.3 (45 CPM), Mk.4 (60 CPM), and Mk.5 (120 CPM).
4. Note Output Ports: The "Number of Output Ports" field will automatically adjust based on the selected Splitter Type.
5. Click Calculate: Press the "Calculate" button.
6. Interpret Results:
   • Required Input Rate per Port: This tells you the ideal CPM each output belt should receive for perfect distribution.
   • Total Output Capacity: This is the maximum CPM all output belts combined can carry.
   • Items per Minute Needed for Full Output: This indicates the total input CPM required to max out your output belts.
   • Satisfactory Throughput Ratio: A value of 100% means your input rate perfectly matches your output capacity. Higher values mean your input is less than max output (potential for overflow if not managed), and lower values indicate a bottleneck (usually the belts or the splitter's inherent limits).
7. Adjust as Needed: Use the information to decide if you need faster belts, a different splitter configuration, or more input production to match your downstream needs.
8. Copy Results: Use the "Copy Results" button to easily paste the calculated values into notes or discussions.
9. Reset: Click "Reset" to clear all fields and start over with default values.

Key Factors That Affect Satisfactory Splitter Throughput

• Input Item Rate (CPM): The most fundamental factor. If you input less than what the outputs can handle, the splitter won't be utilized. If you input more, you might risk overflow if the outputs are already maxed.
• Output Belt Speed (CPM): This is often the primary bottleneck. Even if a splitter *can* handle 240 CPM, if you connect it to four Mk.1 belts (15 CPM each), your effective maximum output is only 60 CPM.
• Number of Output Ports: More outputs allow for wider distribution but divide the input rate among them. A 3-way split of 60 CPM results in 20 CPM per line, whereas a 2-way split would give 30 CPM per line.
• Splitter Configuration (Vanilla vs. Modded): Vanilla splitters have fixed input/output ratios (typically 3 in, 3 out or 1 in, 3 out). Modded splitters can offer configurations like 4 inputs to 2 outputs, drastically changing how items are managed and potentially requiring different input balancing.
• Game Mechanics (Item Distribution Algorithm): Satisfactory's splitters aim for even distribution. If one output is full or removed, the items will be rerouted to the others. This calculator assumes ideal, continuous flow.
• Upstream Production Rate: The rate at which items are produced before the splitter directly dictates how much can be fed into it. Insufficient upstream production leads to underutilization.
• Downstream Consumption Rate: The machines or storage units connected to the splitter's outputs dictate how many items are *actually* pulled away. If consumption is lower than the belt's capacity, items will back up at the splitter.

FAQ: Satisfactory Splitter Calculator

Q: What does "Items per Minute (CPM)" mean?

A: CPM stands for 'Counts Per Minute' and represents the number of individual items that can travel along a conveyor belt or be processed by a machine each minute. It's the standard unit for measuring throughput in Satisfactory.

Q: Do I need mods to use the different splitter types?

A: Yes, the "3-Input, 2-Output", "4-Input, 2-Output", "4-Input, 3-Output", and "3-Input, 4-Output" splitter options typically refer to configurations available through popular Satisfactory mods like "Smart Splitters" or specific QoL mods. Vanilla game splitters are usually 1-in/3-out or 3-in/3-out.

Q: My "Satisfactory Throughput Ratio" is over 100%. What does that mean?

A: A ratio over 100% means your total output belt capacity (e.g., 4 x 60 CPM = 240 CPM) is greater than your current input item rate (e.g., 180 CPM). The splitter will distribute the 180 CPM evenly, but the belts won't be running at their maximum speed. This is often desirable if you plan to increase upstream production later.

Q: My "Satisfactory Throughput Ratio" is under 100%. What does that mean?

A: A ratio under 100% indicates a bottleneck. Either your input item rate is lower than the total capacity of your output belts, or the splitter itself has a configuration limit (like a 4i-2o splitter limited to 240 CPM total input even if belts allow more). The results will show the maximum achievable output based on the lowest limiting factor.

Q: How does the calculator handle the vanilla 1-input, 3-output splitter?

A: The calculator primarily focuses on the distribution aspect. For a vanilla 1-in/3-out splitter, you'd typically set your "Input Item Rate" to the production rate feeding it and "Number of Output Ports" to 3. The "Splitter Type" defaults to "Basic Splitter," which covers this scenario effectively for distribution calculations.

Q: Can this calculator tell me how many splitters I need?

A: This calculator is designed for a single splitter. To determine how many splitters you need for a larger production line, you'd calculate the output of one stage and use that as the input for the next, potentially requiring multiple splitters to achieve the desired distribution or to feed multiple downstream lines.

Q: What if my input item rate isn't a perfect multiple of the number of output ports?

A: Satisfactory's splitters handle this automatically. They distribute items as evenly as possible. For example, if you input 70 CPM into a 3-way splitter, two outputs might receive 23 CPM and one might receive 24 CPM, fluctuating slightly. This calculator provides the ideal target rate per port.

Q: Does the calculator account for item height limits on belts?

A: No, this calculator strictly focuses on items per minute (CPM) throughput. It assumes that the selected belt tier is capable of handling the required CPM and does not factor in item size or specific game mechanics like overflow from height limits on belts.