Arri Alexa Mini Data Calculator

Plan storage, media swaps, and post-production confidence with a premium calculator built for ALEXA Mini shooting scenarios. Estimate recording data rates, total footage size, and card runtime for common ARRIRAW and ProRes workflows.

Expert Guide to Using an ARRI ALEXA Mini Data Calculator

An ARRI ALEXA Mini data calculator is one of the most practical pre-production tools for cinematographers, DITs, line producers, post supervisors, and owner-operators. The ALEXA Mini remains popular because it combines the ARRI color science many crews trust with a compact body suitable for gimbals, drones, handheld work, studio builds, and car rigs. Yet the same flexibility that makes the camera attractive also creates complexity in media planning. Recording format, frame rate, sensor mode, and scheduled shoot duration can dramatically change how many cards you need on set and how much storage you must allocate for near-set backup, editorial handoff, and long-term archiving.

This calculator is designed to turn those choices into realistic storage estimates. It gives you a quick way to model footage volume in gigabytes, approximate megabytes per second, gigabytes per minute, and total runtime on a selected media size. For many productions, this information decides whether a compact card package is enough, whether a cart needs extra shuttle drives, and whether post can comfortably absorb the projected daily camera ratio.

Why data calculation matters before the first shot

On high-end productions, underestimating data needs causes delays that ripple through the entire schedule. Camera may wait for offloads. DIT stations may become bottlenecks. Editorial may receive footage later than planned. Backup verification windows become compressed. If your project uses ARRIRAW or higher-bitrate ProRes options, a single decision to switch frame rate from 24 fps to 60 fps can more than double your total storage requirement. That is exactly why a dedicated ALEXA Mini data calculator belongs in the prep workflow.

A strong estimate supports:

• Media purchase or rental planning
• Card rotation strategy during production days
• DIT offload and checksum scheduling
• Nearline and archive storage budgeting
• Editorial proxy and conform workflow discussions
• Producer visibility into data handling costs

How the calculator works

The calculator above uses codec-specific baseline data rates and scales them according to frame rate. In practical terms, the underlying idea is simple: each recording format has a typical data throughput at a reference frame rate, often 24 fps for cinema planning. When you raise the frame rate, the camera records more frames each second, so the storage requirement increases proportionally in many workflows. The calculator then multiplies the per-second data by your total shooting duration and estimates runtime for the media capacity you selected.

These figures are planning estimates, not a replacement for camera-manufacturer recording charts. Actual usage can vary based on firmware, exact recording mode, media formatting, overhead, and whether a drive or card is labeled in decimal versus binary capacity.

Key variables that affect ALEXA Mini storage

1. Codec. ProRes 422 HQ, ProRes 4444, ProRes 4444 XQ, and ARRIRAW differ significantly in bitrate. ARRIRAW generally requires far more storage but gives maximum flexibility for finishing.
2. Resolution or sensor mode. Open Gate and larger raster options naturally carry more image data than cropped or lower-resolution modes.
3. Frame rate. Higher fps means more frames recorded every second, which usually increases data volume substantially.
4. Shoot duration. Even moderate data rates become large totals over long interview days, concert coverage, live events, or multi-camera productions.
5. Media overhead. Real-world formatted capacity is always lower than the advertised label, and some workflow teams reserve a safety margin rather than filling cards to the final percent.

Approximate recording data rates for planning

The table below summarizes practical planning values often used to estimate ALEXA Mini data needs. These are not manufacturer-certified limits, but they are useful for budgeting and scheduling when you need a fast answer during prep. Values below represent approximate rates at 24 fps and can rise proportionally at higher frame rates.

Codec / Mode	Approx. MB/s at 24 fps	Approx. GB/min	Approx. GB/hour	Best Use Case
ProRes 422 HQ UHD	110 MB/s	6.45 GB	387 GB	Efficient broadcast, branded content, documentary
ProRes 4444 3.2K	165 MB/s	9.67 GB	580 GB	Premium mastering with strong quality-to-size balance
ProRes 4444 XQ 3.2K	220 MB/s	12.89 GB	773 GB	High-end finishing and VFX-intensive work
ARRIRAW 2.8K 16:9	360 MB/s	21.09 GB	1,266 GB	Maximum grading and post latitude
ARRIRAW 3.4K Open Gate	410 MB/s	24.02 GB	1,441 GB	Premium cinema capture with full sensor flexibility

These numbers make one point immediately clear: media planning cannot be guessed. A one-hour day of ProRes 422 HQ can be manageable on a relatively compact storage package. A one-hour day of ARRIRAW Open Gate may require multiple terabytes before you have even created redundant backups. If your project uses multiple camera bodies or intends to roll long takes repeatedly, the numbers scale quickly.

How to think about card runtime

One of the most valuable outputs in a camera data calculator is estimated runtime per card. Production teams rarely fail because they misunderstood image quality. They fail because they run short on time, media, or verified copies. Knowing whether a 512 GB card holds roughly 40 minutes or 80 minutes in a chosen mode changes set behavior. It affects how many cards the 2nd AC needs in rotation, how often the DIT must be ready to ingest media, and whether a lunch break is enough to catch up with backups.

For planning, remember that marketed drive capacity often uses decimal gigabytes while operating systems may report formatted space differently. The U.S. National Institute of Standards and Technology provides helpful background on units and prefixes at nist.gov. For moving-image preservation and file format context, the Library of Congress digital format resources are also useful at loc.gov. Another helpful academic reference for data representation and storage fundamentals can be found through university resources such as stanford.edu materials related to digital media workflows.

Example media planning by card size

The following table shows approximate runtime for common media capacities using representative 24 fps planning rates. This is especially useful when deciding whether your package is adequate for narrative work, interviews, multi-cam event capture, or music performance recording.

Recording Format	256 GB Card	512 GB Card	1 TB Card	2 TB Media
ProRes 422 HQ UHD	about 39.7 min	about 79.4 min	about 155.0 min	about 310.1 min
ProRes 4444 3.2K	about 26.5 min	about 53.0 min	about 103.4 min	about 206.9 min
ProRes 4444 XQ 3.2K	about 19.8 min	about 39.7 min	about 77.5 min	about 155.0 min
ARRIRAW 2.8K 16:9	about 12.1 min	about 24.3 min	about 47.4 min	about 94.8 min
ARRIRAW 3.4K Open Gate	about 10.7 min	about 21.3 min	about 41.7 min	about 83.3 min

Choosing between ProRes and ARRIRAW

Many crews ask whether they should capture ProRes or ARRIRAW on an ALEXA Mini job. There is no universal answer. ProRes often simplifies both storage and post. It can reduce transfer times, lower archive cost, and streamline editorial. ARRIRAW offers the highest level of image flexibility and can be the right choice for VFX-heavy finishing, green-screen work, theatrical mastering, and demanding color pipelines.

• Choose ProRes when speed, efficiency, and manageable file sizes matter most.
• Choose ARRIRAW when image latitude, debayer control, and premium finishing flexibility justify larger data loads.
• Use the calculator before committing because a creative preference may turn into a logistical issue if media stock, backup drives, or labor are limited.

Practical workflow advice for producers and DITs

Storage planning should happen in layers. Start with camera-original estimates from a tool like this calculator. Next, account for redundancy. Professional workflows usually maintain at least two verified copies before media is cleared. Many productions also create a third archive or transport copy. If your calculator predicts 4 TB of camera originals for the day, the real storage footprint may be 8 TB to 12 TB once duplicated. Then add room for reports, LUTs, sound sync materials, and possible proxies.

Another best practice is to apply a safety margin. If a day is estimated at 3.6 TB, do not provision exactly 4 TB and hope everything lands perfectly. Unscripted schedules, retakes, overtime, and high-speed coverage can all push usage higher. A healthy planning margin protects the schedule and reduces stress for camera and post teams.

Common mistakes when estimating ALEXA Mini data

• Ignoring frame rate changes for slow motion sequences
• Assuming all ProRes variants are similar in size
• Forgetting that formatted media capacity is lower than label capacity
• Budgeting only for originals and not for verified duplicate copies
• Not recalculating after a switch to Open Gate or RAW capture
• Using per-hour estimates without considering total shooting ratio

How to use this calculator on real jobs

Suppose you are planning a commercial on the ALEXA Mini in ProRes 4444 XQ at 24 fps with 90 minutes of total expected rolling time. Enter the codec, choose the closest sensor mode, set 24 fps, enter 90 minutes, and choose your card size. The calculator will estimate your total footprint and show how long one card lasts. If the resulting runtime per card is short, you may decide to rent extra media or assign more offload resources.

Now imagine the same job adds 60 fps beauty passes. If you update the calculator to 60 fps, the storage estimate rises sharply. That single test reveals a practical truth: many storage overruns happen not because the main shooting mode was misunderstood, but because specialty shots were added without revisiting the data plan.

Final recommendation

An ARRI ALEXA Mini data calculator is not just a convenience widget. It is a serious planning instrument for professional image capture. Use it early in prep, revisit it when camera settings change, and share the resulting numbers with camera, DIT, post, and production management. When everyone works from the same storage assumptions, the shoot becomes more predictable, media handling becomes safer, and the project avoids preventable downtime.

If you want the most reliable workflow, pair calculator estimates with current manufacturer recording documentation and your actual post-delivery requirements. But for fast, informed decision-making, this tool gives you the kind of immediate visibility that modern digital cinema production demands.