---
title: "HDMI 2.1 size — 48 Gbit/s — 4K at 120 Hz, 8K at 60 Hz"
description: "HDMI 2.1: 48 Gbit/s at full capability, but the label alone guarantees nothing. Full dimensions in millimetres, centimetres and inches, and what the standard actuall"
url: https://atoneplace.net/size/hdmi-21/
site: "At One Place"
---

# HDMI 2.1 size

**HDMI 2.1: 48 Gbit/s — 4K at 120 Hz, 8K at 60 Hz**

At full capability it carries 4K at 120 Hz or 8K at 60 Hz, plus variable refresh rate and enhanced audio return. The catch is that HDMI 2.1 features are optional. After the 2.0 label was retired, a device supporting only old 2.0 capabilities can still be sold as 2.1, and many are. Check for the named features — 4K120, VRR, eARC — rather than the version number.

## The numbers

- **Specification:** 48 Gbit/s — 4K at 120 Hz, 8K at 60 Hz
- **Defined by:** HDMI Forum

## Video connectors

| Size | Millimetres | Inches |
| --- | --- | --- |
| HDMI 2.1 ← | 48 Gbit/s — 4K at 120 Hz, 8K at 60 Hz | — |
| HDMI 2.0 | 18 Gbit/s — 4K at 60 Hz | — |
| DisplayPort 1.4 | 32.4 Gbit/s — 4K at 120 Hz with compression | — |
| HDMI 1.4 | 10.2 Gbit/s — 1080p at 120 Hz or 4K at 30 Hz | — |

## Common questions

### What size is HDMI 2.1?

48 Gbit/s at full capability, but the label alone guarantees nothing.

### Which standard defines HDMI 2.1?

HDMI Forum

## Related pages

- [HDMI 2.0 size](https://atoneplace.net/size/hdmi-20/)
- [DisplayPort 1.4 size](https://atoneplace.net/size/displayport-14/)
- [HDMI 1.4 size](https://atoneplace.net/size/hdmi-14/)

## Sources

- Official vendor product documentation — At One Place (/about/)