Video File Size Calculator
Planning a video shoot? Estimate how much storage space you need for 1080p, 4K, or ProRes footage.
🎥Video Size
Formula:
Size = Bitrate × Duration
Bitrate is the key driver of quality and size.
Minutes
Estimated File Size
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Mathematical Principles
Video file size is a direct function of the data rate (bitrate) and time. Resolution (like 4K) matters only because it forces you to use a higher bitrate to maintain quality.
1. The Formula
File Size = Bitrate × Duration
2. Understanding Bitrate
Bitrate is usually measured in Mbps (Megabits per second).
To get the file size in GB (Gigabytes):
1. Calculate total Megabits: Bitrate (Mbps) × Duration (seconds)
2. Convert to Megabytes: Total Megabits / 8
3. Convert to Gigabytes: Total Megabytes / 1000 (or 1024 for binary GB)
3. Example: 1 Minute of 4K Video
If your camera records 4K at 100 Mbps:
Total Bits = 100 Mbps × 60 seconds = 6,000 Megabits.
Total Bytes = 6,000 / 8 = 750 Megabytes (MB).
Total GB = 0.75 GB.
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Frequently Asked Questions
The main factor is Bitrate (amount of data per second), followed by Duration. Resolution and Frame Rate indirectly affect file size because higher quality usually requires a higher bitrate to look good.
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Tips
- Enter the dimensions in the same unit for consistency.
- Results update automatically as you type.
- Use the unit selector to convert between different measurement systems.
Need Help?
Check out our guide on how to use this calculator properly and understand the concepts behind it.
Learn about video size calculations