---
title: "USB — every size in mm and inches"
description: "Every usb size with dimensions in millimetres, centimetres and inches, and the standard that defines each."
url: https://atoneplace.net/size/usb/
site: "At One Place"
---

# USB

4 usb, with what each one actually specifies.

| Name | Millimetres | Inches | Notes |
| --- | --- | --- | --- |
| USB-C connector | 8.34 × 2.56 mm | 0.33 × 0.10 | A connector, not a speed — 8.34 × 2.56 mm, reversible. |
| USB 3.x | 5, 10 or 20 Gbit/s depending on generation | — | 5 Gbit/s originally, renamed repeatedly — check the speed, not the name. |
| USB 2.0 | 480 Mbit/s, 2.5 W (500 mA at 5 V) | — | 480 Mbit/s. Still what most cables and keyboards use. |
| USB4 | 20, 40 or 80 Gbit/s; USB-C connector only | — | 40 Gbit/s typical, built on the Thunderbolt 3 protocol. |

- [USB-C connector size](https://atoneplace.net/size/usb-c/) — A connector, not a speed — 8.34 × 2.56 mm, reversible.
- [USB 3.x size](https://atoneplace.net/size/usb-3/) — 5 Gbit/s originally, renamed repeatedly — check the speed, not the name.
- [USB 2.0 size](https://atoneplace.net/size/usb-2/) — 480 Mbit/s. Still what most cables and keyboards use.
- [USB4 size](https://atoneplace.net/size/usb-4/) — 40 Gbit/s typical, built on the Thunderbolt 3 protocol.