The short version
DCI 2K is 2048 × 1080 and DCI 4K is 4096 × 2160, both using a 256:135 container ratio. Consumer products often call 2560 × 1440 '2K' and 3840 × 2160 '4K,' so exact dimensions matter more than the label.
What matters most
- Cinema and consumer standards use different frames.
- DCI 4K has exactly four times the pixels of DCI 2K.
- Always state pixel dimensions in production specifications.
How to apply it
- Identify whether the workflow is cinema, broadcast, web or computer display.
- Read the exact width and height rather than the K label.
- Choose the corresponding aspect ratio and scaling method.
- Confirm the delivery specification before encoding.
Reference table
| Label | Exact dimensions | Context |
|---|---|---|
| DCI 2K | 2048 × 1080 | Digital cinema container |
| 1440p/QHD | 2560 × 1440 | Computer displays |
| 4K UHD | 3840 × 2160 | Consumer video and displays |
| DCI 4K | 4096 × 2160 | Digital cinema container |
Use exact dimensions and units in production notes; familiar labels can describe more than one standard.
Common mistakes to avoid
- Treating every use of 2K as 2560 × 1440.
- Mixing DCI and UHD footage without planning crop or padding.
- Communicating only a marketing name to collaborators.
Continue with the right tool
Use a calculator to check the numbers against your own source and destination instead of relying on a generic preset.
Related guides
Video Resolution Chart: SD, HD, Full HD, 2K, 4K and 8K
Compare common video resolutions, pixel counts, aspect ratios and practical uses without confusing consumer UHD and cinema formats.
Video quality and delivery720p vs 1080p: Resolution, Pixel Count and File Size
Compare 1280×720 and 1920×1080 video, including pixel count, scaling, bandwidth and when each resolution makes sense.
Video quality and delivery1080p vs 4K: Pixels, Viewing Distance and Real-World Tradeoffs
Compare Full HD and 4K UHD by pixel count, display conditions, editing load, bitrate and storage before choosing a format.
Frequently asked questions
Is 1440p true 2K?
Not by the DCI cinema definition; the name is nevertheless common in monitor marketing.
Is 4K exactly double 2K?
The width and height double within matching DCI standards, producing four times the pixels.
Which 4K should YouTube use?
Standard 16:9 consumer delivery normally uses 3840 × 2160 rather than the wider DCI container.