How many extractors do I need to fill a belt in shapez.io?

To fill a belt, divide the Belt Speed by the Extractor Speed. For example, if your Belt Speed is 15 items/sec and your Extractor Speed is 3 items/sec, you need exactly 5 Extractors to achieve 100% belt saturation.

What is the perfect ratio for painters?

The perfect ratio depends on your current upgrade tiers. You must calculate the speed of the Painter against your Belt Speed. If a Painter processes 2 items/sec and your belt supplies 20 items/sec, you need 10 Painters in parallel to process the full belt without causing a backup.

Why are my machines backing up?

Machines back up when the input belt supplies items faster than the machine array can process them, or when the output belt does not have enough capacity to carry away the processed items. Balancing the ratios is required to maintain continuous flow.

Shapez.io Calculator | Belt Ratios & Machine Optimizer

Tier Parameters

Belt Speed (items/s) 15.0

Target Machine

Machine Speed (items/s) 3.0

Number of Full Input Belts

Optimal Factory Layout

Required Input/s

0/s

Expected Output/s

0/s

Machines Needed (Perfect Ratio)
0

Array Schematic

shapez.io Factory Optimization Guide

In shapez.io, efficiency is everything. Unlike games where you can just throw more machines at a problem, shapez.io requires precise mathematical ratios to ensure your belts are fully saturated. A bottleneck anywhere in your production line means wasted space and slower progress.

Understanding Belt Saturation

The core concept of shapez.io math revolves around the Belt Speed. If your belts move at 15 items per second, your goal is to feed exactly 15 items per second onto that belt. Any more, and the machines will back up and pause. Any less, and you are not utilizing the belt's full capacity.

Basic Ratio Formula:
Required Machines = (Target Belt Speed) ÷ (Machine Processing Speed)

Example: Belt Speed = 15/s. Extractor Speed = 3/s. You need exactly 5 Extractors merging onto one belt to achieve 100% saturation.

Complex Machine Ratios

While Extractors are simple, processing machines complicate the math:

Cutters: Cutters take 1 item in and output 2 halves. If you need a full belt of Right Halves, you must account for the fact that the cutter is splitting the input belt's throughput.
Painters & Stackers: These machines take 2 inputs (e.g., a Shape and a Color) to produce 1 output. To output a full belt (15/s), you must feed them a full belt of shapes (15/s) AND a full belt of color (15/s). The required number of painters is calculated against the desired output belt speed.

Why is my output belt not full?

Double-check your machine tiers. If you upgrade your Belt speed but don't upgrade your Machine speed, your existing arrays will no longer saturate the faster belts. You must either add more machines to the array or upgrade the machine tier to match.

Do balancers slow down the belt?

No. Balancers, splitters, and tunnels operate at the exact speed of the belts connected to them. They do not inherently restrict throughput unless they are routing a fast belt onto a slower tier belt.

Read Also:

shapez.io Ratio Calculator