AJA Data Calculator
Estimate storage needs for video recording by bitrate, runtime, stream count, and safety overhead.
Tip: A safety overhead of 10% helps account for filesystem use, clip fragmentation, and unexpected overrun.
Why an AJA data calculator matters in real production
Storage planning is one of the least glamorous parts of video production, but it is absolutely one of the most important. If you underestimate your media requirements by even a little, you can lose time, miss shots, or force last-minute changes in quality settings. An AJA-style data calculator helps you estimate exactly how much storage your workflow requires before you step on set.
Whether you are working in broadcast, live events, post-production ingest, or multi-camera documentary capture, the same rule applies: know your bitrate, know your duration, and build in margin. This page gives you a practical calculator plus a framework you can use to make dependable decisions fast.
What this calculator does
This calculator estimates media needs from a few key inputs:
- Video bitrate in megabits per second (Mb/s)
- Audio bitrate in kilobits per second (kb/s)
- Program duration in hours, minutes, and seconds
- Number of simultaneous streams (for multi-cam or ISO capture)
- Safety overhead to reduce the risk of underestimating
- Drive capacity and reserve percentage to estimate practical record time
Results are shown in GB and TB, along with an estimate for how many hours a drive can sustain at your chosen settings.
How the math works (simple version)
1) Combine your data rate
Total bitrate starts with video plus audio. Audio is converted from kb/s to Mb/s first. If you are recording multiple streams, the total is multiplied by the number of streams.
2) Convert bitrate to total data
Data size is bitrate multiplied by total seconds. Because bitrates are in bits and storage is usually discussed in bytes, the total is divided by 8. Then it is converted into GB/TB for practical planning.
3) Add operational overhead
Real-world production almost always needs overhead. Filesystem use, metadata, and segment behavior can all consume extra space. A 5% to 15% margin is common for controlled workflows.
Recommended workflow for planning media
- Start with your expected codec and frame size preset.
- Enter full-day runtime, not just interview or stage time.
- Account for all ISO records and backup captures.
- Add overhead before buying or allocating media.
- Validate with a short real recording test whenever possible.
Common mistakes this helps prevent
Ignoring stream count
One program feed is not the same as five isolated camera recordings. Stream count dramatically changes storage requirements.
Confusing Mb and MB
Bitrate is typically in megabits per second; storage is usually in megabytes or gigabytes. Forgetting the bit-to-byte conversion can produce an 8x error.
Skipping safety margin
Many teams plan at theoretical minimums and run out of space under pressure. Include overhead early and your shoot days become calmer.
Quick reference tips
- Higher frame rates and higher bit-depth generally increase data rates significantly.
- Long-form events benefit from larger, fewer media swaps when reliability allows.
- When in doubt, overestimate storage and keep spare media ready.
- For mission-critical events, design for redundancy, not minimum capacity.
Final thought
A reliable data estimate is a quiet superpower in production planning. Use this AJA data calculator at prep time, confirm your assumptions, and arrive on set with enough headroom to focus on creative execution instead of emergency media management.