Optimizing Eurorack Space: Navigating the HP and Inches Conversion

November 27th, 2023

Eurorack enthusiasts and modular synthesizer aficionados recognize the importance of efficient space utilization in creating powerful and customizable setups. The fact that creativity knows no bounds in the realm of Eurorack synthesis makes it even more crucial to have the right tools at your disposal, especially when it comes to HP and Inches conversions. Today, we're delving into the nuts and bolts of Eurorack design, focusing on a practical aspect that often defines the success of a modular setup – space management.

Space management in Eurorack design presents a multifaceted challenge that demands a delicate balance between creative freedom and physical constraints. With modules varying in size, shape, and functionality, optimizing the horizontal pitch (HP) becomes a puzzle where each piece must fit seamlessly. The challenge lies not only in the spatial arrangement of modules but also in the accessibility and ergonomic design of the setup. As enthusiasts aim to create comprehensive and inspiring modular systems, they grapple with the intricacies of module density, ensuring that the limited HP real estate is utilized efficiently without sacrificing usability.

Furthermore, the introduction of new and innovative modules adds to the complexity, requiring adaptability in accommodating diverse sizes within the rack. Navigating these challenges demands a keen understanding of HP and inches conversion, thoughtful planning, and constant consideration of the delicate equilibrium between sonic exploration and the physical limitations of the Eurorack framework.

HP (horizontal pitch) and Inches Relationship In Eurorack Design

HP serves as the standardized unit determining the width of individual modules, with 1 HP conventionally equaling 0.2 inches. Understanding this relationship allows enthusiasts to strategically plan the layout of their modules within the limited space of the Eurorack case. When converting between inches and HP, the formula HP = (Module Width in Inches / Standard HP Width) is employed, enabling users to seamlessly integrate modules of varying sizes while ensuring an efficient use of space. This relationship forms the backbone of Eurorack customization, providing a quantitative framework for enthusiasts to navigate the spatial considerations inherent in modular synthesis.

Formula for Converting Inches to HP

HP = Module Width in Inches / 0.2


Module Width in Inches = HP × 0.2

Having gained a comprehensive understanding of the pivotal relationship between HP and inches in Eurorack design, let's now look at actionable tips for effectively managing space within your modular setup.

10 Tips for Space Management in Eurorack Design

  1. Plan for Future Expansion
  2. When designing your Eurorack setup, anticipate future module additions. Leave some unoccupied HP (horizontal pitch) space in your case to accommodate new modules or future upgrades. This proactive approach prevents the need for frequent rearrangements and ensures your system remains flexible and scalable. Many Eurorack manufacturers offer blank panels to fill the empty space.

  3. Prioritize Essential Modules
  4. Identify and prioritize essential modules that form the core of your sound and workflow. Place these modules in easily accessible areas of your case to minimize cable clutter and facilitate efficient patching. By centralizing crucial components, you create a focused and ergonomic workspace within your Eurorack system.

  5. Use Multi-Function and Compact Modules
  6. Opt for multi-function modules that offer multiple features in a compact footprint such as the JCS Synchronizing delay for delay controls. This allows you to maximize functionality while conserving space. Experiment with different signal routings, modulation sources, and CV interactions. Additionally, consider compact versions of modules when available, especially for utility functions, to optimize space without sacrificing essential capabilities.

  7. Explore Folding or Sliding Case Designs
  8. Consider innovative case designs that offer space-saving features, such as folding or sliding configurations. These designs enable you to access different rows of modules while conserving space when not in use. Folding cases, in particular, provide a compact solution for transport or storage, making them ideal for musicians on the go or those with limited studio space.

  9. Consider 1U Utility Modules
  10. Explore the use of 1U utility modules that fit in the standard 1U row commonly found in Eurorack cases. These smaller modules are often dedicated to utility functions like mixing, attenuating, or generating basic signals. Integrating 1U modules allows you to reserve more HP in the main rows for specialized sound-generating modules, making efficient use of space.

  11. Precision in Patch Cable Lengths
  12. Use patch cables of appropriate lengths to minimize cable clutter and avoid unnecessary slack. Precision in cable management contributes to a tidy and organized setup, preventing signal interference and making it easier to trace and troubleshoot connections. Consider having a variety of cable lengths on hand to suit different patching scenarios. Use cable ties, holders, or Velcro strips to bundle and route cables neatly. Many musicians color code their cables by length so that finding the right size cable in a bundle can be done at a glance.

  13. Custom Case Designs
  14. If possible, explore custom case designs tailored to your specific needs. Custom cases can be built to accommodate your exact power and space requirements. This approach allows you to create a Eurorack system that aligns perfectly with your workflow and spatial constraints.

    Get in touch with us to design your own custom eurorack case at cost-effective rates, accompanied by the extra perk of free shipping to any location across the United States.

  15. Implement a Eurorack Skiff Style Case
  16. A Eurorack Skiff Style Case is one with a shallow depth. These designs provide a good compromise between space-saving and accommodating a variety of modules. Shallow cases are especially useful when desk or studio space is limited, allowing you to position your Eurorack setup conveniently without sacrificing functionality. A shallow case will accommodate most standard Eurorack modules, however some manufacturers' modules will be too deep to fit in a skiff.

  17. Accurate Power Specifications
  18. Pay close attention to the power specifications of each module. Modules have specific power requirements, including current draw and voltage specifications. Verify that your power supply and distribution meet the needs of your modules, preventing potential damage and ensuring optimal performance. Keep track of power consumption to avoid overloading your power supply or distribution board.

  19. Standard HP Measurement
  20. Adhere to the standardized horizontal pitch (HP) measurement in Eurorack, which is 1/5th of an inch per HP as described in the previous section. Ensuring that your modules and cases comply with this measurement standard promotes compatibility and interoperability. It allows modules from different manufacturers to fit seamlessly into Eurorack cases, minimizing issues related to physical compatibility.

The JCS Online Inches to Horizontal Pitch (HP) Calculator

Our online HP/inches calculator allows you to effortlessly convert measurements between the respective units, ensuring your modules and accessories seamlessly fit into your custom-built cases.

Click here to use our online Inches to HP converter.


As the modular synthesizer community continues to flourish, Jake's Custom Shop is dedicated to providing you with the tools and knowledge needed to craft the ultimate Eurorack experience. The Inches to Horizontal Pitch Calculator is just one of many resources we offer to empower your modular journey.