Video File Size Calculator by Bitrate

Estimate video file size from duration and bitrate for 480p to 4K, and the upload time at your internet speed.

How to Calculate Video Size

Enter the duration, choose the quality and audio bitrate and your upload speed. Click File Size Nikalein.

What is the formula?

Size = (video + audio bitrate) × seconds ÷ 8.

Which quality should I choose?

1080p at around 8 Mbps suits most YouTube videos.

Why is my real file different?

Variable bitrate encoding changes the size.

How is upload time found?

File size in megabits divided by your upload speed.

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Last updated: 06 Nov 2026 • 100% free • Mobile friendly

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