UHD Resolution Reference
UHD resolution is 3840 × 2160 (8.29 MP, 16:9); 8K UHD is 7680 × 4320. Calculate PPI and viewing distance, check HDMI/DisplayPort bandwidth, and compare 31 resolutions.
UHD resolution is 3840 × 2160 pixels: 8,294,400 pixels (about 8.3 megapixels) at a 16:9 aspect ratio, exactly four times 1920 × 1080.
Use the UHD Resolution Reference
PPI, Screen Size & Viewing Distance Calculator
Preloaded with a 27-inch UHD monitor. Pick a preset or type any dimensions.
PPI = √(width² + height²) ÷ diagonal. The acuity distance is where one pixel subtends one arcminute (20/20 vision); from farther away adjacent pixels merge. Physical size assumes square pixels.
UHD-1, UHD-2 and DCI 4K Compared
What each standard actually specifies. "4K" on a TV box means UHD-1; "4K" in a cinema means the DCI container.
| Property | 4K UHD (UHD-1) | 8K UHD (UHD-2) | DCI 4K |
|---|---|---|---|
| Pixels (W × H) | 3840 × 2160 | 7680 × 4320 | 4096 × 2160 (full container) |
| Total pixels | 8,294,400 | 33,177,600 | 8,847,360 |
| Aspect ratio | 16:9, square pixels | 16:9, square pixels | 256:135 ≈ 1.90:1 |
| Frame rates | 23.976–120 Hz progressive | 23.976–120 Hz progressive | 24 fps (2K also at 48) |
| Bit depth | 10 or 12 bit | 10 or 12 bit | 12 bit |
| Color | BT.2020 primaries; HDR via BT.2100 (PQ, HLG) | BT.2020 primaries; HDR via BT.2100 | X′Y′Z′ (DCI-P3 projector gamut) |
| Defined in | ITU-R BT.2020; SMPTE ST 2036-1 | ITU-R BT.2020; SMPTE ST 2036-1 | DCI Digital Cinema System Spec. |
| Consumer label | CTA "4K Ultra HD" | CTA "8K Ultra HD" | Cinema projection |
The CTA (formerly CEA) "Ultra High-Definition" display definition requires at least 8 million active pixels, at least 3840 horizontal and 2160 vertical, an aspect ratio of at least 16:9, and at least one digital input that accepts native 3840 × 2160 video. Its 8K definition requires 7680 × 4320, 10-bit input and HDCP 2.2 on HDMI.
HDMI & DisplayPort Bandwidth for UHD
Uncompressed video data rate for the frame size above, including blanking, compared with each link's payload after line coding.
Data rate: ·
| Link | Payload | Uncompressed? |
|---|
Rate = Htotal × Vtotal × Hz × bits per pixel (bit depth × 3 for 4:4:4, × 2 for 4:2:2, × 1.5 for 4:2:0). CTA-861 uses the TV timings 4400/5280/5500 × 2250 at 3840 × 2160 (other sizes are scaled); CVT-RB v2 uses an 80-pixel horizontal blank and a 460 µs vertical blank. Audio, HDMI 4:2:2 packing (always a 24-bit container) and DSC compression are not modelled; HDMI 1.4 carries 3840 × 2160 only up to 30 Hz with 4:4:4.
UHD vs Other Resolutions: 31 Formats Compared
Where 4K UHD and 8K UHD sit among 31 common display, TV, web-video and cinema formats, and which standard defines each one. Search by name or number (try “2160” or “16:9”), sort any column, or download the table.
Last verified against the primary sources: . Data license: CC BY 4.0 (free to reuse with a link to this page).
| 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.
Same 16:9 Shape, More Pixels
UHD keeps the 16:9 shape of 720p and 1080p, so HD content scales to fill the screen without letterboxing: 1080p maps exactly 2 × 2 and 720p exactly 3 × 3 onto UHD pixels.
Rectangle widths are proportional to the square root of pixel count, so their areas compare pixel totals (not screen sizes).
Standards and References
- ITU-R BT.2020-2 defines the UHDTV image formats 3840 × 2160 and 7680 × 4320, frame rates, 10/12-bit coding and the wide-gamut primaries.
- ITU-R BT.2100 adds the PQ and HLG high-dynamic-range transfer functions to the same image formats.
- DCI Digital Cinema System Specification 1.4.2 defines the 4096 × 2160 cinema 4K container.
- CTA 8K Ultra HD display definition and the CEA "Ultra High-Definition" display characteristics (2012, revised 2014) set the consumer labelling rules.
The calculators run locally in your browser; nothing you enter is uploaded or stored.
Cite this page
Top10k Tools. (2026, October 9). Common Screen and Video Resolutions (UHD Resolution Reference). https://top10k.com/tool/uhd-resolution-reference
"Common Screen and Video Resolutions (UHD Resolution Reference)." Top10k Tools, 9 Oct. 2026, top10k.com/tool/uhd-resolution-reference.
Quick answer
UHD resolution is 3840 × 2160 pixels: 8,294,400 pixels (about 8.3 megapixels) at a 16:9 aspect ratio, exactly four times 1920 × 1080. ITU-R BT.2020 also defines 8K UHD at 7680 × 4320. Cinema DCI 4K is wider at 4096 × 2160, so "4K" and "UHD" are not always the same frame.
Example: a 27-inch 3840x2160 monitor has √(3840² + 2160²) ÷ 27 = 4,405.8 ÷ 27 ≈ 163.2 PPI, on a screen about 23.53 x 13.24 inches
Enter your screen size for PPI, physical size and viewing distance, or a refresh rate for HDMI/DP bandwidth.
Summary
Ultra High Definition (UHD) is the television image format defined in ITU-R BT.2020: 3840 × 2160 pixels (4K UHD, also called UHD-1) and 7680 × 4320 pixels (8K UHD, UHD-2), both 16:9 with square pixels. This page calculates pixel density, physical screen size and 20/20 viewing distance for any display, estimates the uncompressed HDMI and DisplayPort data rate for any refresh rate, bit depth and chroma format, and compares UHD with 30 other resolutions in a sourced table you can search, sort and download.
How it works
- Pick a preset or type any width and height, then enter the screen diagonal in inches.
- The analyzer returns aspect ratio, pixel count relative to UHD, PPI = √(w² + h²) ÷ diagonal, physical width and height, pixel pitch and the distance at which one pixel subtends one arcminute.
- In the bandwidth card, choose refresh rate, bit depth, chroma format and timing; data rate = total pixels per frame (including blanking) × refresh rate × bits per pixel, compared with each HDMI and DisplayPort payload limit.
- Search or sort the resolution table, or download it as CSV.
Use cases
- Verify whether a display or video file is true UHD (3840 × 2160) or DCI 4K (4096 × 2160).
- Calculate the pixel density and viewing distance of a UHD monitor or TV at a given size.
- Check whether HDMI 2.0, HDMI 2.1 or DisplayPort 1.4 can carry 4K at 60, 120 or 144 Hz.
- Understand the pixel count difference between 1080p, 1440p, 4K UHD and 8K UHD.
- Choose the right export resolution for streaming or video editing projects.