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Video File Size Calculator by Bitrate and Duration

Free video file size calculator for MP4, MOV and web uploads. Enter duration, resolution and bitrate to estimate storage before you export or upload.

Common: 1080p = 5-8 Mbps, 4K = 35-45 Mbps

Estimated File Size

375.00 MB

Based on 5 Mbps for 600 seconds

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What is Video File Size Calculator?

Estimate the digital storage footprint in megabytes (MB) and gigabytes (GB) of your video exports before rendering long projects. By calculating total file size from video bitrate, audio bitrate, and playback duration using the formula File Size = Total Bitrate × Duration / 8, it helps videographers, streamers, and animators optimize export settings to satisfy email attachment constraints, platform upload limits, and local hard drive storage capacities. Prevent unexpected export bloat and plan storage archives with confidence.

How to Use Video File Size Calculator in 4 Easy Steps

1

Step 1

Enter the total duration of your video in hours, minutes, and seconds.

2

Step 2

Specify your target video bitrate (in Mbps or kbps) based on your codec (H.264, H.265, ProRes).

3

Step 3

Input the audio bitrate (commonly 128, 192, 256, or 320 kbps).

4

Step 4

Review the calculated estimated total file size in megabytes (MB) and gigabytes (GB).

Honest Technical Specifications & Limits

Calculation Model

Precise constant bitrate (CBR) and average variable bitrate (VBR) estimation.

Units

Converts seamlessly between kbps, Mbps, MB, and GB.

Codec Versatility

Works for all video formats including MP4, MKV, MOV, AVI, and WebM.

Privacy First: 100% Client-Side In-Browser Processing

100% In-Browser Local Execution. Video File Size Calculator operates directly inside your browser memory using client-side JavaScript and WebAssembly. Your data is never transmitted over the internet or logged on remote servers. You can open Developer Tools (F12) Network tab to verify zero outbound network calls.

Verify it yourself: Open your browser's Developer Tools (F12 or Inspect), switch to the Network tab, and perform your action. You will observe zero outbound data uploads — your data never leaves your computer.

Popular Real-World Use Cases

Video Export Bitrate Tuning

Determine what Mbps bitrate to set in Premiere Pro or DaVinci Resolve to keep a video file under 500 MB.

Server Bandwidth & Video Hosting Planning

Estimate CDN storage costs and streaming bandwidth for hosting hours of training video libraries.

SD Card & Hard Drive Capacity Planning

Calculate how many hours of 4K 60fps footage will fit on a 128 GB camera memory card.

Calculations, Formulas & Practical Examples

Video File Size Calculator Operational Logic

Real-Time Input Validation -> Client-Side Algorithm -> Formatted Output

Calculates and transforms inputs in local browser memory with sub-millisecond latency.

Standard Workflow Scenario

Using Video File Size Calculator for instant data processing.

Input: Sample user parameters or text input
Output: Instant verified result ready for export or copying

Frequently Asked Questions

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