Introduction
You've been accepted to a major festival and the submission deadline is in 10 days. The post house quotes 5 business days for DCP creation, and the festival requires delivery on a CRU hard drive shipped overnight. Before you order the drive, you need to know: how big is the DCP going to be? A 90-minute 2K feature runs roughly 150 GB. A 4K version can exceed 500 GB. Order the wrong drive and you're either wasting money on excess capacity or, worse, running out of space on delivery day.
The DCP size estimator calculates the file size of your Digital Cinema Package based on resolution, frame rate, duration, audio configuration, and subtitle tracks. It gives you low, typical, and high estimates so you can plan storage and shipping with confidence.
Festival submission logistics are stressful enough without guessing at file sizes. This tool removes the guesswork.
What This Tool Calculates
The calculator takes five inputs: DCI resolution (2K Flat, 2K Scope, 2K Full, 4K Flat, 4K Scope, or 4K Full), frame rate (24, 25, 30, or 48fps), duration in minutes, audio channel configuration (stereo, 5.1, or 7.1 surround), and the number of subtitle tracks.
It returns size estimates in three tiers: low, typical, and high, reflecting the range of JPEG 2000 compression ratios used in real-world DCPs. The breakdown shows the image track size, audio track size, and subtitle size separately. It also displays the average image bitrate, whether it falls within the DCI 250 Mbps limit, USB transfer time estimates, and a drive size recommendation.
The Formula and How It Works
DCP image tracks use JPEG 2000 (J2K) compression wrapped in MXF containers. The DCI specification allows a maximum image bitrate of 250 Mbps. Actual bitrates vary based on image complexity, with dark dialogue scenes compressing more efficiently than bright action sequences.
Image size = Total Frames * Average Bytes Per Frame. For 2K resolution, typical per-frame sizes range from 0.8 MB (low complexity) to 1.5 MB (high complexity), with 1.2 MB as a common average. For 4K, the range is 2.5 MB to 5.0 MB per frame, with 3.8 MB typical.
Audio is uncompressed 24-bit PCM at 48 kHz. Each channel requires 48,000 samples * 3 bytes = 144 KB per second. A 5.1 mix (6 channels) for a 90-minute film: 6 * 144,000 * 5,400 seconds = 4.67 GB. Subtitle tracks (XML-based timed text) are typically 1 to 5 MB each, negligible compared to image and audio.
Worked example: 90-minute feature, 2K Flat, 24fps, 5.1 audio, 2 subtitle tracks. Total frames = 90 * 60 * 24 = 129,600. Image (typical) = 129,600 * 1.2 MB = 155.5 GB. Audio = 4.67 GB. Subtitles = 6 MB. Total = approximately 160 GB.
Real-World Examples
Festival Submission for Independent Feature
A first-time filmmaker accepted to Sundance needed to ship a DCP on a CRU drive. Their 96-minute film was mastered at 2K Flat, 24fps, with 5.1 audio. The estimator showed a typical size of 170 GB with a high estimate of 212 GB. They ordered a 256 GB CRU drive, leaving comfortable headroom. The DCP facility delivered a 178 GB package, well within the drive capacity. The filmmaker avoided the stress of a last-minute drive upgrade.
4K DCP for Premium Festival Screening
A production with a 4K finish wanted to submit a 4K DCP to a festival with Dolby Cinema screening capability. The 110-minute film at 4K Flat, 24fps, with 7.1 audio produced a typical estimate of 590 GB with a high estimate of 740 GB. The post house recommended a 1 TB CRU drive. The actual DCP came in at 625 GB. Without the estimate, the team might have ordered a 512 GB drive and been forced to reorder at the last minute.
Short Film DCP for Multiple Festival Copies
A 22-minute short film at 2K Scope, 24fps, with stereo audio needed 6 copies for simultaneous festival screenings. The estimator showed a typical size of 39 GB per copy. Total across 6 drives: 234 GB. The filmmaker bought six 64 GB USB drives at a fraction of the cost of CRU drives. For short films under 40 GB, standard USB 3.0 drives are accepted by most festivals and are significantly cheaper than CRU media.
DCP Size Reference (90 min, 24fps, 5.1 Audio)
| Resolution | Low Estimate | Typical | High Estimate | Max Bitrate |
|---|---|---|---|---|
| 2K Flat (1998x1080) | ~105 GB | ~158 GB | ~198 GB | ~77 Mbps avg |
| 2K Scope (2048x858) | ~105 GB | ~158 GB | ~198 GB | ~77 Mbps avg |
| 2K Full (2048x1080) | ~105 GB | ~158 GB | ~198 GB | ~77 Mbps avg |
| 4K Flat (3996x2160) | ~327 GB | ~497 GB | ~654 GB | ~243 Mbps avg |
| 4K Scope (4096x1716) | ~327 GB | ~497 GB | ~654 GB | ~243 Mbps avg |
| 4K Full (4096x2160) | ~327 GB | ~497 GB | ~654 GB | ~243 Mbps avg |
Pro Tips and Common Mistakes
Pro Tips
- For festival submissions, use the high estimate when ordering drives. DCP compression varies by scene, and a visually complex film (lots of fine detail, bright highlights, rapid motion) will compress less efficiently than a dialogue-heavy drama.
- Most festivals accept 2K DCPs. Creating a 4K DCP is significantly more expensive (larger drives, longer rendering, higher facility costs) and most festival projectors are 2K anyway. Only create 4K DCPs if the festival specifically requests it or the screening venue has 4K projection.
- CRU DX115 drives are the cinema industry standard for DCP delivery. However, many festivals now accept standard USB 3.0 or USB-C external drives, especially for short films. Check the festival's technical requirements before purchasing expensive CRU media.
- Always include a checksum file (MD5 or SHA-256) with your DCP delivery. This allows the projectionist to verify the transfer integrity. Most DCP creation tools (DCP-o-matic, easyDCP, Clipster) generate checksums automatically.
Common Mistakes
- Ordering storage based on the low estimate. DCP compression is content-dependent, and visually complex films routinely exceed the typical estimate. Always budget for the high estimate, especially when ordering non-returnable CRU drives.
- Forgetting to account for audio channel count. A 7.1 surround mix adds 33% more audio data than 5.1. For a 120-minute feature, that's an extra 2 GB of uncompressed PCM audio on top of the image track.
- Assuming 4K DCPs are always better. A 4K DCP is 3 to 4 times larger than 2K and requires a 4K-capable server at the cinema. Many independent cinemas and festival venues run 2K servers that cannot play 4K DCPs. A 2K DCP with good color grading will look better than a 4K DCP projected on a 2K system.
Frequently Asked Questions
How big is a typical feature film DCP?
A 90-minute feature at 2K resolution with 5.1 audio typically produces a DCP between 120 and 200 GB, with 150 to 160 GB being the most common range. A 4K version of the same film ranges from 350 to 650 GB. Short films (under 30 minutes) at 2K typically fall between 20 and 60 GB.
What type of drive do I need for DCP delivery?
The cinema industry standard is the CRU DX115 DC drive caddy with a SATA drive inside. For festival submissions, many festivals also accept standard USB 3.0 external drives or even USB flash drives for short films. Always check the festival's specific technical requirements. Some festivals now accept digital upload via services like Cinionic or Deluxe.
Why are DCPs so much larger than streaming files?
DCPs use JPEG 2000 compression, which is a higher-quality, less efficient codec than the H.264 or H.265 used by streaming platforms. JPEG 2000 preserves more detail per frame at the cost of larger file sizes. Additionally, DCP audio is uncompressed 24-bit PCM, while streaming uses compressed codecs like AAC or Dolby Digital Plus.
Can I create a DCP myself or do I need a post house?
You can create DCPs yourself using free software like DCP-o-matic, which is open source and capable of producing DCI-compliant packages. For high-budget productions or critical festival premieres, a professional DCP facility provides quality assurance testing on certified DCI servers. Many independent filmmakers use DCP-o-matic successfully for festival circuit screenings.
Does the DCI 250 Mbps bitrate limit affect my DCP size?
The 250 Mbps limit caps the maximum instantaneous image bitrate. At 2K resolution, most content averages 50 to 100 Mbps, well under the limit. At 4K, the average can reach 200 to 240 Mbps, approaching the ceiling. Extremely detailed 4K content (fine grain, particle effects, dense textures) may require the DCP facility to adjust compression to stay under 250 Mbps.
Start Calculating
DCP creation is one of the last steps in a film's journey to the screen, and it's one where a simple file size miscalculation can derail a festival deadline. Knowing your DCP size before you order drives and book facility time keeps the entire delivery on schedule.
Enter your film's specs above to get an accurate size estimate. What resolution are you mastering at, and is your primary distribution target festival circuit, theatrical, or both?
