What exactly is 4K resolution?

4K UHD (Ultra High Definition) refers to a display or video frame that is 3840 pixels wide and 2160 pixels tall (3,840 x 2,160 = 8,294,400 total pixels), progressive scan, at a 16:9 widescreen aspect ratio. The term "4K" approximates the ~4000-pixel horizontal count. True DCI 4K used in digital cinema is 4096 x 2160, but consumer 4K UHD at 3840 x 2160 is the standard for TVs, monitors, and streaming platforms.

What bitrate should I use for 4K?

For standard streaming at 30 fps, 35–45 Mbps (H.264) is a common target. YouTube recommends 35–45 Mbps for 4K30 and 53–68 Mbps for 4K60. With H.265/HEVC, you can achieve similar quality at roughly half the bitrate. AV1 cuts it further — around 15–20 Mbps for 4K30 at near-lossless streaming quality.

How much storage does one hour of 4K video take?

At 40 Mbps (YouTube 4K30): 40 Mbps x 3600 s / 8 = approximately 18 GB/hour. At 60 Mbps (4K60) it is roughly 27 GB/hour. Camera raw 4K (e.g. 12-bit ProRes RAW or BRAW) can exceed 200–500 GB/hour depending on the codec, bit depth, and frame rate.

Is 4K worth it on a small screen?

The benefit of 4K diminishes on small screens because the human eye cannot resolve the extra pixels beyond a certain viewing distance. On a 27-inch monitor viewed from 24 inches, 4K (163 PPI) delivers a noticeably sharper image than 1080p (82 PPI). On a 55-inch TV viewed from 8 feet, the extra sharpness is less perceptible. Use the PPI calculator on this page to evaluate any screen size.

What is the difference between 4K UHD and DCI 4K?

4K UHD (consumer standard) is 3840 x 2160 pixels with a 16:9 aspect ratio. DCI 4K (cinema standard) is 4096 x 2160 pixels with a 1.90:1 aspect ratio. TVs, monitors, and streaming services use UHD 4K. Digital cinema projectors and professional cameras use DCI 4K. Many cinema cameras can shoot both.

How does 4K compare to 1080p in file size?

4K has exactly 4x more pixels than 1080p (8,294,400 vs 2,073,600). At the same bitrate efficiency, 4K files are roughly 3–4x larger. Efficient modern codecs like H.265 or AV1 narrow the gap somewhat, but 4K still demands significantly more storage and bandwidth than 1080p.

What HDR standards are used with 4K?

The main HDR standards for 4K content are: HDR10 (open standard, 10-bit, static metadata — most widely supported), HDR10+ (dynamic metadata, Samsung-backed), Dolby Vision (dynamic metadata, 12-bit capable, licensed), and HLG (Hybrid Log-Gamma, used in broadcast). Most streaming services deliver 4K with HDR10, while premium services also offer Dolby Vision or HDR10+.

4K Resolution Reference

Name: 4K Resolution Reference
Availability: InStock
Author: Nham Vu

Quick-reference specs for 4K Ultra HD (3840x2160) plus an interactive PPI calculator, bitrate table, and comparison against 1080p and 1440p.

Resolution

3840 x 2160

pixels (W x H)

Total Pixels

8,294,400

per frame

Aspect Ratio

16:9

widescreen

Standard Name

4K UHD

Ultra High Definition

Pixel Density Calculator

Enter the diagonal screen size to find the PPI of a 4K UHD display.

inches

Common 4K Screen Sizes

Screen Size	PPI
24 in	184 PPI
27 in	163 PPI
32 in	138 PPI
43 in	102 PPI
55 in	80 PPI
65 in	68 PPI

Recommended Bitrates

Common encoding targets for 4K at 30 and 60 fps.

Use Case	Bitrate
YouTube 4K30 (H.264)	35 – 45 Mbps
YouTube 4K60 (H.264)	53 – 68 Mbps
Streaming 4K30 (H.265)	15 – 25 Mbps
Streaming 4K (AV1)	10 – 20 Mbps
Archival / Master (H.265)	40 – 80 Mbps
Camera ProRes / RAW	500 – 2000 Mbps

File Size Estimates — 4K UHD

Approximate storage for a 4K30 video at various bitrates.

Bitrate	1 min	10 min	1 hour
20 Mbps (H.265 efficient)	~150 MB	~1.5 GB	~9 GB
40 Mbps (YouTube 4K30)	~300 MB	~3 GB	~18 GB
60 Mbps (YouTube 4K60)	~450 MB	~4.5 GB	~27 GB
100 Mbps (production proxy)	~750 MB	~7.5 GB	~45 GB
800 Mbps (ProRes 4444 30 fps)	~6 GB	~60 GB	~360 GB

Resolution Comparison

How 4K UHD stacks up against other common standards.

Standard	Width	Height	Total Pixels	vs 4K	Label
480p (SD)	854	480	409,920	0.05x	SD
720p (HD)	1280	720	921,600	0.11x	HD Ready
1080p (FHD)	1920	1080	2,073,600	0.25x	Full HD
1440p (QHD)	2560	1440	3,686,400	0.44x	Quad HD
4K (UHD)	3840	2160	8,294,400	1x	Ultra HD
DCI 4K (Cinema)	4096	2160	8,847,360	1.07x	DCI 4K
8K (UHD-2)	7680	4320	33,177,600	4x	8K UHD

Quick Facts

Scan type: Progressive (p)
Aspect ratio: 16:9
Common frame rates: 24, 25, 30, 60, 120 fps
Bit depth (standard SDR): 8-bit
Bit depth (HDR): 10-bit (HDR10 / Dolby Vision)
Color space (SDR): Rec. 709
Color space (HDR): Rec. 2020 (BT.2020)
HDR standards supported: HDR10, HDR10+, Dolby Vision, HLG
Pixels vs 1080p: 4x more (4K = 4 x FHD)
Uncompressed data rate (8-bit, 30 fps): ~12 Gbps
Consumer adoption milestone: ~2014 (4K TV launch wave)
Display label: 4K UHD / Ultra HD

Copy Spec Snippet

Click any row to copy the spec to your clipboard.

Resolution 3840 x 2160 px

Total pixels 8,294,400 pixels

Aspect ratio 16:9

Official name 4K UHD / Ultra HD

Uncompressed rate ~12 Gbps (8-bit 30 fps)

Summary

Quick-reference specs for 4K Ultra HD (3840x2160) plus an interactive PPI calculator, bitrate table, and comparison against 1080p and 1440p.

How it works

Read the spec card to get the key 4K numbers at a glance.
Enter your screen diagonal in inches to calculate the pixel density (PPI) for any 4K display.
Use the comparison table to see how 4K stacks up against 720p, 1080p, and 1440p.
Check the bitrate and file size tables for encoding guidance across different platforms.
Review the Quick Facts panel for bit depth, color space, HDR standard, and frame rate details.

Use cases

Choosing an export resolution for YouTube, Vimeo, or 4K streaming platforms.
Verifying pixel density (PPI) for a 4K monitor or TV before purchase.
Setting FFmpeg, Handbrake, or DaVinci Resolve encoding parameters for 4K output.
Comparing storage requirements between 1080p, 1440p, and 4K for a video project.
Understanding 4K gaming resolution and the GPU performance impact vs 1080p.
Teaching or explaining Ultra HD resolution concepts to students or clients.
Planning bandwidth and CDN costs for delivering a 4K live stream.
Confirming whether a display, camera, or capture card is truly 4K before purchase.

Frequently Asked Questions

Last updated: 2026-06-09 · Reviewed by Nham Vu