Estimate video file sizes based on duration, resolution, and codec. Plan your storage needs for any video project.
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Quick Facts
H.264 vs H.265
50% smaller files
H.265 offers better compression
4K vs 1080p
4-5x larger files
Higher resolution = more data
ProRes
3-5x larger than H.264
Professional editing format
1 Hour 4K H.264
~18 GB
Typical streaming quality
Estimated File Size
Calculated
File Size
0 MB
For your video
Per Hour
0 MB
Hourly rate
Bitrate
0 Mbps
Data rate
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About Video File Size Calculation
Video file size depends on several factors including resolution, codec, duration, and bitrate. Understanding these factors helps you plan storage requirements for your video projects, whether you're creating content for YouTube, streaming platforms, or professional productions.
How Video File Size is Calculated
The basic formula for estimating video file size is:
File Size = Bitrate (Mbps) x Duration (seconds) / 8
This gives you the file size in megabytes. The bitrate varies significantly based on resolution and codec choice.
Understanding Video Codecs
H.264 (AVC) - The most widely compatible codec, great for streaming and general use
H.265 (HEVC) - 50% more efficient than H.264, ideal for 4K content but requires more processing power
ProRes - Professional editing codec with minimal compression, used in film and TV production
Typical Bitrates by Resolution
Resolution
H.264 (Mbps)
H.265 (Mbps)
ProRes (Mbps)
720p (HD)
5
2.5
15
1080p (Full HD)
8
4
25
1440p (2K)
16
8
45
4K (Ultra HD)
40
20
100
Storage Planning Tips
Always plan for 20-30% extra storage beyond your calculated needs
Consider using H.265 for 4K content to save storage space
ProRes is best for editing workflows where you'll be re-encoding
Cloud storage services often have different pricing for frequently vs. rarely accessed files
Frequently Asked Questions
How accurate are the results?
The Video File Size applies a standard formula to your inputs — accuracy depends on how precisely you measure those inputs. For planning and estimation, results are reliable. For high-stakes or professional decisions, cross-check the output with a domain expert or primary source.
Can I use this on mobile?
Yes — the calculator is designed to work on any device. For complex multi-input calculations on small screens, landscape orientation gives more room to see all fields and results simultaneously.
Practical Guide for Video File Size Calculator
Video File Size Calculator is most useful when the inputs reflect the situation you are actually planning around, not a best-case estimate. Treat the result as a decision aid: it gives you a structured way to compare assumptions, spot outliers, and decide what to verify next. For Specialized work, the most important review lens is definition consistency, measurement window, data quality, and whether the metric matches the decision being made.
Start with a baseline run using values you can defend. Then change one assumption at a time and watch which output moves the most. If one input dominates the result, spend your verification time there first. If several inputs have similar influence, use a conservative scenario and an optimistic scenario to create a practical range instead of relying on a single exact number.
Before acting on the result, compare the result with the source system or analytics export that produced the inputs. This is especially important when the calculator supports a purchase, project plan, performance target, or operational decision. The calculator can make the math consistent, but the quality of the conclusion still depends on current data, clear units, and assumptions that match your real constraints.
Review Checklist
Confirm every input uses the unit and time period requested by the calculator.
Run a low, expected, and high scenario so the answer has a useful range.
Check whether rounding or a missing decimal place changes the decision.
Update the calculation each reporting cycle or whenever tracking, attribution, pricing, or process rules change.