Braw Calculator

What is braw calculator?

A braw calculator is an essential tool for filmmakers, cinematographers, and post-production professionals working with Blackmagic Design cameras. BRAW, or Blackmagic RAW, is a revolutionary codec that combines the quality and benefits of RAW recording with the speed, ease of use, and file sizes of traditional video formats.

The braw calculator allows you to precisely estimate the amount of storage space required for a production. Unlike standard compressed codecs, BRAW offers various constant bitrate and constant quality options, making it difficult to guess file sizes without a dedicated braw calculator. Whether you are shooting in 12K on an URSA Mini Pro or 4K on a Pocket Cinema Camera, using a braw calculator ensures you never run out of media on set.

Common misconceptions include the idea that BRAW is “just another RAW format.” In reality, BRAW performs a partial debayering in-camera, which means your computer doesn’t have to work as hard during playback, while the braw calculator shows that file sizes remain incredibly manageable compared to Uncompressed RAW or CinemaDNG.

braw calculator Formula and Mathematical Explanation

To understand how the braw calculator derives its results, we must look at the variables involving resolution, frame rate, bit depth, and the compression ratio. BRAW is technically a 12-bit format, but because it is partially debayered, the raw data rate is lower than a full RGB 12-bit file.

The core mathematical logic used in our braw calculator follows this derivation:

Formula: Bitrate (MB/s) = (Width × Height × Bit Depth Factor × FPS) / (Compression Ratio × 8 × 1024 × 1024)

BRAW Calculator Variable Table
Variable	Meaning	Unit	Typical Range
Width	Horizontal Pixels	px	1920 – 12288
Height	Vertical Pixels	px	1080 – 6480
Bit Depth	Color Precision	bits	12-bit (fixed)
FPS	Frames Per Second	fps	23.976 – 120+
Compression	BRAW Ratio	ratio	3:1, 5:1, 8:1, 12:1

Practical Examples (Real-World Use Cases)

Example 1: Indie Feature Film
A production team is shooting a feature in 6K (6144 x 3456) at 24 fps using 5:1 compression. By entering these values into the braw calculator, they find the data rate is approximately 103 MB/s. For a standard 10-hour shoot day with 2 hours of footage, the braw calculator estimates they need 741 GB of storage.

Example 2: Slow Motion Commercial
A commercial requires 4K DCI footage at 120 fps for extreme slow motion. Using 8:1 compression to save space, the braw calculator reveals a data rate of roughly 235 MB/s. Even though the compression is higher, the high frame rate increases storage needs significantly, requiring fast CFast or NVMe drives.

How to Use This braw calculator

Select Resolution: Choose your camera’s sensor mode (e.g., 6K, 4K, 12K) from the dropdown in the braw calculator.
Enter Frame Rate: Input your project’s shooting frame rate. Remember that high-speed recording (HFR) will multiply your storage needs.
Choose Compression: Select between Constant Bitrate (3:1 to 12:1) for predictable sizes, or Constant Quality (Q0, Q5) for variable complexity scenes.
Input Duration: Enter the total expected minutes of footage.
Read the Results: The braw calculator instantly updates the total GB needed, the bitrate in MB/s, and how much you can fit on a 1TB drive.

Key Factors That Affect braw calculator Results

Sensor Crop: Shooting in “Windowed” modes reduces the resolution and consequently the file size shown in the braw calculator.
Frame Rate (FPS): Doubling the frame rate (e.g., from 30 to 60 fps) exactly doubles the storage requirement in the braw calculator.
Compression Ratio: This is the most significant factor. Moving from 3:1 to 12:1 reduces file sizes by 75%.
Scene Complexity (Quality Modes): In Q0 or Q5 modes, the braw calculator provides an average, but highly detailed scenes (like trees or water) will result in larger files than static shots.
Bit Depth: BRAW is always 12-bit, providing massive dynamic range compared to 8-bit or 10-bit H.264/H.265.
Storage Media Overhead: Always allow for 5-10% “safety margin” beyond what the braw calculator suggests due to drive formatting and metadata.

Frequently Asked Questions (FAQ)

1. Is BRAW better than ProRes?

BRAW offers RAW flexibility (ISO, White Balance) with file sizes often smaller than ProRes 422 HQ, as seen in our braw calculator.

2. Does the braw calculator account for audio?

Yes, our braw calculator includes a standard overhead for multi-channel linear PCM audio typically recorded by Blackmagic cameras.

3. What is the difference between Constant Bitrate and Constant Quality?

Constant Bitrate (e.g., 5:1) ensures predictable file sizes in the braw calculator. Constant Quality (Q levels) varies the bitrate to maintain a specific visual fidelity.

4. Can I trust the braw calculator for Q0/Q5 modes?

These are estimates. Q0 usually falls between 3:1 and 8:1, while Q5 is typically around 12:1 or higher depending on the motion and detail.

5. Why does 12K require so much more space?

12K has 9 times more pixels than 4K. The braw calculator reflects this massive increase in data throughput.

6. Can any drive record 3:1 6K?

No, you need media with high sustained write speeds. Use the MB/s output from the braw calculator to check your SSD or CFast card specs.

7. Does the braw calculator work for all Blackmagic cameras?

Yes, it supports resolutions used across the Pocket, URSA, and Studio camera lines.

8. Is BRAW compressed?

Yes, BRAW is a compressed RAW format. The braw calculator helps you choose the right balance between compression and quality.

Related Tools and Internal Resources

BRAW Storage Guide – Deep dive into SSD and CFast card compatibility.
Video Bitrate Calculator – Compare BRAW with other codecs like H.265.
DaVinci Resolve Optimization – Learn how BRAW speeds up your editing workflow.
Color Grading RAW Footage – Tips for using the metadata captured in BRAW.
Camera Runtime Calculator – Estimate battery life alongside your storage needs.
Lens Coverage Tool – Ensure your lenses can resolve the 12K detail calculated here.

BRAW Calculator

Storage Comparison (GB per Hour)