Yes. 3840 × 2160 is 4K UHD (Ultra HD), the resolution used by 4K TVs, monitors, streaming services and most cameras recording consumer 4K. The slightly wider 4096 × 2160 is DCI 4K, the digital-cinema format.

What is the aspect ratio of 3840x2160?

16:9. Dividing both sides by their greatest common divisor, 240, gives 3840 ÷ 240 = 16 and 2160 ÷ 240 = 9, the same widescreen shape as 1920 × 1080 and 1280 × 720.

What exactly is 4K resolution?

In consumer displays and common 16:9 video workflows, 4K UHD means 3840 pixels wide by 2160 pixels tall (8,294,400 total pixels). The term “4K” approximates the horizontal sample count. The DCI digital-cinema 4K container is up to 4096 × 2160, so the context matters.

What bitrate should I use for 4K?

Bitrate depends on frame rate, codec, content and delivery platform. For a fixed 40 Mbps example, one hour is about 18 GB before audio and container overhead. Use the current requirements of the destination platform rather than treating one bitrate as universal.

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

Resolution alone does not determine storage. At a user-selected 40 Mbps, 40 × 3,600 ÷ 8 ÷ 1,000 = 18 decimal GB before audio and container overhead. Enter the actual video bitrate and duration for your file.

What is the PPI of a 27-inch 4K display?

A 3840 × 2160 panel with a 27-inch diagonal is approximately 163.2 pixels per inch. PPI describes pixel density; perceived sharpness also depends on viewing distance and eyesight.

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

The UHD image format is 3840 × 2160 at 16:9. The DCI digital-cinema specification supports a 4K decoder output up to 4096 × 2160; that full container is 256:135, approximately 1.90:1. A camera, file or display may support one or several formats, so inspect its actual dimensions.

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

4K has exactly four times the pixels of 1080p, but that does not make every encoded file four times larger. File size is determined mainly by bitrate and duration: size in bytes is bitrate in bits per second multiplied by seconds, divided by eight.

Which standard defines each common screen resolution?

TV and video formats come from ITU-R recommendations: 1280 × 720 in BT.1543, 1920 × 1080 in BT.709, and 3840 × 2160 and 7680 × 4320 in BT.2020. Computer sizes such as 1024 × 768, 1366 × 768 and 1920 × 1200 come from the VESA DMT list, and cinema 2K and 4K from the DCI specification. Sizes like 3440 × 1440 and 5120 × 2880 are vendor formats with no standard entry. The table on this page lists the source for every row and can be downloaded as CSV.

Does 3840 × 2160 automatically mean HDR?

No. Resolution and dynamic range are separate properties. A 3840 × 2160 file or display can be SDR or HDR, with different bit depths, transfer functions and color metadata.

4K Resolution Reference

4K UHD is 3840 × 2160 pixels (8,294,400 pixels, 16:9). Calculate aspect ratio, megapixels, PPI and video storage for any dimensions.

3840x2160 is 4K UHD: 3,840 pixels wide by 2,160 pixels tall, 8,294,400 pixels in total, at a 16:9 aspect ratio.

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

Resolution, PPI & File Size Calculator

Preloaded with 3840 × 2160. Change any value to analyze another display or video.

Width (px)

Height (px)

Diagonal (in)

Bitrate (Mbps)

Duration (minutes)

Aspect ratio

Total pixels

Megapixels

Pixel density

Video size (decimal)

File size uses bitrate × duration ÷ 8 and excludes small container/audio overhead.

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

YouTube Upload Bitrates

Official YouTube upload recommendations checked September 2026. These are not universal streaming or camera-recording rates.

Use Case	Bitrate
2160p SDR, 24/25/30 fps	35 – 45 Mbps
2160p SDR, 48/50/60 fps	53 – 68 Mbps
2160p HDR, 24/25/30 fps	44 – 56 Mbps
2160p HDR, 48/50/60 fps	66 – 85 Mbps

Source: YouTube recommended upload encoding settings. YouTube re-encodes uploads.

File Size Estimates — 4K UHD

Decimal storage examples from bitrate × seconds ÷ 8. Resolution and frame rate do not determine size without a bitrate or codec setting.

Bitrate	1 min	10 min	1 hour
20 Mbps	~150 MB	~1.5 GB	~9 GB
40 Mbps	~300 MB	~3 GB	~18 GB
60 Mbps	~450 MB	~4.5 GB	~27 GB
100 Mbps	~750 MB	~7.5 GB	~45 GB
800 Mbps	~6 GB	~60 GB	~360 GB

Common Screen and Video Resolutions

How 4K UHD compares with 31 common display, TV, web-video and cinema formats, and which standard defines each one. Search by name or number, sort any column, or download the table.

Last verified against the primary sources: October 9, 2026. Data license: CC BY 4.0 (free to reuse with a link to this page).

Download CSV 31 rows


240p	426	240	102,240	0.10	71:40 (~16:9)	Web video	YouTube recommended upload resolutions
360p	640	360	230,400	0.23	16:9	Web video	YouTube recommended upload resolutions
VGA	640	480	307,200	0.31	4:3	Computer display	VESA DMT 1.0 rev. 13
480p (web)	854	480	409,920	0.41	427:240 (~16:9)	Web video	YouTube recommended upload resolutions
SVGA	800	600	480,000	0.48	4:3	Computer display	VESA DMT 1.0 rev. 13
XGA	1024	768	786,432	0.79	4:3	Computer display	VESA DMT 1.0 rev. 13
XGA+	1152	864	995,328	1.00	4:3	Computer display	VESA DMT 1.0 rev. 13
720p HD	1280	720	921,600	0.92	16:9	TV and video	ITU-R BT.1543-1 (2015)
WXGA	1280	800	1,024,000	1.02	16:10	Computer display	VESA DMT 1.0 rev. 13
SXGA	1280	1024	1,310,720	1.31	5:4	Computer display	VESA DMT 1.0 rev. 13
WXGA (1360)	1360	768	1,044,480	1.04	85:48 (~16:9)	Computer display	VESA DMT 1.0 rev. 13
FWXGA (1366)	1366	768	1,049,088	1.05	683:384 (~16:9)	Laptop display	VESA DMT 1.0 rev. 13
SXGA+	1400	1050	1,470,000	1.47	4:3	Computer display	VESA DMT 1.0 rev. 13
WXGA+	1440	900	1,296,000	1.30	16:10	Computer display	VESA DMT 1.0 rev. 13
HD+	1600	900	1,440,000	1.44	16:9	Computer display	VESA DMT 1.0 rev. 13
UXGA	1600	1200	1,920,000	1.92	4:3	Computer display	VESA DMT 1.0 rev. 13
WSXGA+	1680	1050	1,764,000	1.76	16:10	Computer display	VESA DMT 1.0 rev. 13
1080p Full HD	1920	1080	2,073,600	2.07	16:9	TV and video	ITU-R BT.709-6 (2015)
WUXGA	1920	1200	2,304,000	2.30	16:10	Computer display	VESA DMT 1.0 rev. 13
DCI 2K	2048	1080	2,211,840	2.21	256:135 (~1.90:1)	Digital cinema	DCI Digital Cinema System Specification 1.4.2 (2022)
QWXGA	2048	1152	2,359,296	2.36	16:9	Computer display	VESA DMT 1.0 rev. 13
UW-FHD	2560	1080	2,764,800	2.76	64:27 (~21:9)	Ultrawide display	CTA-861 video format list
1440p QHD	2560	1440	3,686,400	3.69	16:9	Monitor and video	YouTube recommended upload resolutions
WQXGA	2560	1600	4,096,000	4.10	16:10	Computer display	VESA DMT 1.0 rev. 13
UWQHD	3440	1440	4,953,600	4.95	43:18 (~21:9)	Ultrawide monitor	No standard format (vendor/marketing size)
4K UHD	3840	2160	8,294,400	8.29	16:9	TV and video	ITU-R BT.2020-2 (2015)
DCI 4K	4096	2160	8,847,360	8.85	256:135 (~1.90:1)	Digital cinema	DCI Digital Cinema System Specification 1.4.2 (2022)
DQHD (32:9)	5120	1440	7,372,800	7.37	32:9	Super-ultrawide monitor	No standard format (vendor/marketing size)
5K2K	5120	2160	11,059,200	11.06	64:27 (~21:9)	Ultrawide display	CTA-861 video format list
5K	5120	2880	14,745,600	14.75	16:9	Monitor	No standard format (vendor/marketing size)
8K UHD	7680	4320	33,177,600	33.18	16:9	TV and video	ITU-R BT.2020-2 (2015)

Pixel counts, megapixels and exact ratios are computed from width × height. Names such as XGA or WUXGA are industry shorthand: the documents define pixel dimensions, not nicknames. "~" marks the nominal ratio a format is sold under when the exact ratio differs.

Sources: ITU-R BT.1543-1 (2015); ITU-R BT.709-6 (2015); ITU-R BT.2020-2 (2015); DCI Digital Cinema System Specification 1.4.2 (2022); VESA DMT 1.0 rev. 13; CTA-861 video format list; YouTube recommended upload resolutions. VESA DMT and CTA-861 are member documents; their format lists were checked against the DMT and CTA-861 mode tables in the Linux kernel EDID code (drm_edid.c). Rows marked "No standard format" are vendor sizes that appear in neither list.

UHD and DCI Facts

Consumer UHD frame: 3840 × 2160
Aspect ratio: 16:9
Total samples / pixels: 8,294,400
DCI 4K maximum container: 4096 × 2160
DCI 4K container ratio: 256:135 (~1.90:1)
Pixels vs 1080p: Exactly 4×
Each axis vs 1080p: Exactly 2×
Resolution implies HDR?: No
Resolution fixes bitrate?: No
PPI needs screen diagonal?: Yes
File size needs bitrate?: Yes
Display label: 4K UHD / Ultra HD

Standards and Current References

SMPTE ST 2036-3 identifies the 3840 × 2160 UHDTV image format.
DCI Digital Cinema System Specification 1.4.2 defines a 4K decoder output up to 4096 × 2160.
YouTube resolution guidance lists 2160p (4K) as 3840 × 2160 for its 16:9 workflow.
YouTube upload guidance is the source for the SDR/HDR bitrate examples above; destination requirements can change.
ITU-R BT.2020-2 (Table 1) lists 3840 × 2160 and 7680 × 4320 as the UHDTV pixel counts, with square pixels at 16:9.

Cite this page

APA

Top10k Tools. (2026, October 9). Common Screen and Video Resolutions (4K Resolution Reference). https://top10k.com/tool/4k-resolution-reference

MLA

"Common Screen and Video Resolutions (4K Resolution Reference)." Top10k Tools, 9 Oct. 2026, top10k.com/tool/4k-resolution-reference.

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

Common name 4K UHD / Ultra HD

Quick answer

3840x2160 is 4K UHD: 3,840 pixels wide by 2,160 pixels tall, 8,294,400 pixels in total, at a 16:9 aspect ratio. That is exactly four times 1920x1080; cinema (DCI) 4K is slightly wider at 4096x2160.

Examples

4K screen size	Pixel density
27-inch monitor	163.2 PPI
32-inch monitor	137.7 PPI
55-inch TV	80.1 PPI
65-inch TV	67.8 PPI

Enter your own screen size for its exact PPI, or your bitrate for the file size.

Summary

Consumer 4K Ultra HD (UHD) uses a frame size of 3840 × 2160 pixels — exactly 8,294,400 pixels per frame — at a 16:9 aspect ratio. Each axis is twice 1920 × 1080, so the frame contains exactly four times as many pixels. This page calculates aspect ratio, megapixels, screen PPI and bitrate-based storage and distinguishes UHD from 4096 × 2160 DCI 4K.

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.
Search or sort the resolution table to compare 4K with 30 other display, video and cinema formats, or download it as CSV.
Use the custom bitrate and duration inputs for a transparent decimal-GB storage estimate.
Check the sourced YouTube upload examples, then verify the current requirements for your destination.

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: 2026-10-09 · Reviewed by Nham Vu