How long can an HDMI cable be?
A standard HDMI cable is reliable for 4K up to about 5m, and usually to 10m. Longer than that, use an active or fibre-optic HDMI cable, which boosts the signal.
Checked 7th November 2026.
Worth knowing
- Fibre-optic HDMI cables only work one way round: the ends are marked Source and Display.
- For a run through a wall to another room, an HDMI extender over a network cable is another option.
High Speed HDMI, 5m£3.17 at TV Cables
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Answer checked by Tely. Prices and stock from TV Cables’ product feed, last updated 7th November 2026. Shop links earn Tely a small commission; it never decides what we recommend. How we check.