Video File Size Calculator
Estimate the file size of your recorded video clips based on duration, resolution formats, compression qualities, and codecs.
Video Duration
Video Specifications
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Professional Grade Tool Specs
Evaluate potential video storage footprints and upload bandwidth times dynamically.
Multi-Codec Support
Instantly calculate estimates for H.264, high-efficiency H.265, VP9 (WebM), and editing codecs like Apple ProRes.
Granular Quality Presets
Choose between low compression ratios, medium default, or high quality profiles to see size changes.
Real-time Calculations
Estimates update dynamically as you drag duration sliders or switch frames per second (FPS).
Compatibility Diagnostics
Automatically checks if the estimated file size fits within standard Discord or email attachment limits.
Upload Time Estimates
Understand how long it will take to upload your video to the cloud at average connection speeds.
Fully Private & In-Browser
All calculations happen locally inside your web browser. No files, configurations, or parameters are ever uploaded.
How to Use the Video File Size Calculator
Set Duration
Enter the hour, minute, and second duration of your video clip, or use the quick-slider.
Select Configuration
Choose your desired resolution (e.g. 1080p, 4K), frame rate (FPS), compression preset, and video codec.
Review Diagnostics
Inspect the calculated file size estimation, compatibility checks, and estimated upload duration instantly.
Frequently Asked Questions
Everything you need to know about video bitrates and compression.
Our calculator uses average target bitrates. If your video is static (like a slide presentation or reading text), modern video encoders use compression algorithms to only record updated pixels, yielding file sizes that are up to 60-80% smaller than estimated. Fast-paced high-motion content (like gameplay) will require the full bitrate, matching our calculator estimations.
Select H.264 for maximum compatibility. Almost all phones, tablets, browsers, and media players support H.264 inside MP4 files. H.265/HEVC is ideal for reducing files sizes by ~40% while preserving UHD quality, but it has limited compatibility in older web browsers. VP9 inside WebM is best for direct web streaming.
Apple ProRes is an intra-frame editing codec that is virtually uncompressed. It stores high precision visual details on every individual frame without inter-frame temporal compression. It is designed for high-end post-production workflows rather than web streaming or storage.
Audio bitrates are relatively small compared to video streams. For example, a high-quality 128 kbps stereo track only adds about 0.9 MB per minute to your video file. While increasing it to 320 kbps offers audiophile-grade quality, the overall file size footprint remains negligible compared to video compression settings.
Yes, our calculator estimates the theoretical file sizes based on bitrate calculations of popular video compression standards (like H.264, H.265, VP9, and ProRes). While container wraps (like MP4, MKV, or MOV) add tiny packaging metadata overhead, the actual file size is 99% dictated by the video codec and average bitrates calculated here.