Factorio Production Line Ratio Calculator

How to calculate Factorio ratios?

Ratios are determined by aligning the crafting speed of machines with the recipe duration and your desired output rate.

Formula: Machines = (Items/sec * Recipe Time) / (Crafting Speed * Yield)

Using the Production calculator: an example

To produce 15 Electronic Circuits per second using Assembler 2s (0.75 speed) with a 0.5s recipe time.

Step-by-step calculation:

• Identify target rate: 15 items/sec
• Calculate machine throughput: (0.75 speed / 0.5s time) * 1 yield = 1.5 items/sec/machine
• Divide target by throughput: 15 / 1.5 = 10 machines
• Check belt capacity: 15 items/sec = 100% of a Yellow Belt

Frequently Asked Questions

How do Productivity Modules affect this?

Productivity modules increase yield per craft but slow down crafting speed; you must adjust both variables for accuracy.

What is Crafting Speed?

It is a multiplier applied to the base recipe time. An Assembler 3 has a base speed of 1.25, making recipes finish faster than the tooltip suggests.