====== Panel Sizes ======
This mainly discusses the dimension for the front panel but in the units used recommended PCB dimensions are noted.
==== Units used ====
These are based on standard rack measurement units, they are:

| Height | Rack Units | U | 44.45mm | 1.75" |
| Width | Horizontal Pitch | HP | 5.08mm | 0.2" |

For Eurorack the height is **3U, 128.5mm**.

==== PCBs ====

The maximum height of the PCB behind this is typically **110mm** giving 9.25mm clearance top and bottom to allow for rack mounts, although 100mm is often used, especially if the PCB is going to a manufacturer such as JLCPCB. 

The width can be calculated as: **(HP x 5.08) - 0.34** to allow for side clearance.

==== Mounting ====
Mounting holes have a diameter of 3.2mm and are placed as follows:
{{ :eurorack:panel.png?400 |}}
Note: At 9HP and below only drill holes on the left side are used.

==== Quick Reference ====
^ HP ^ nominal (mm) ^ actual (mm) ^
| 1 | 5.08 | 5 | 
| 2 | 10.16 | 9.8 |
| 4 | 20.32 | 20 |
| 6 | 30.48 | 30 |
| 8 | 40.64 | 40.3 |
| 10 | 50.8 | 50.5 |
| 12 | 60.96 | 60.6 |
| 14 | 71.12 | 70.8 |
| 16 | 81.28 | 80.9 |
| 18 | 91.44 | 91.3 |
| 20 | 101.6 | 101.3 |
| 21 | 106.68 | 106.3 |
| 22 | 111.76 | 111.4 |
| 28 | 142.24 | 141.9 |
| 42 | 213.36 | 213 |