Free tool
Video Bitrate & File Size Calculator
Enter a bitrate and a duration to get the exact file size, or enter the size you need (for WhatsApp, email or a pen drive) to get the bitrate to export at.
Your video
Result
File size–- Total bitrate
- –
- Per minute
- –
- Video bitrate for target size
- –
How it works
File size = (video bitrate + audio bitrate) × duration ÷ 8. Bitrate is in bits per second, so dividing by 8 gives bytes. For the reverse calculation, the tool divides the target size by the duration and subtracts the audio bitrate.
Questions
What bitrate should I use for YouTube?
YouTube recommends about 8 Mbps for 1080p at 24–30 fps, 12 Mbps for 1080p at 50–60 fps, 35–45 Mbps for 4K at 24–30 fps and 53–68 Mbps for 4K at 50–60 fps (SDR, H.264). The preset buttons use these values.
Why is my exported file a little different from the result?
Most exports use variable bitrate (VBR), so the real bitrate goes up and down with the picture. Container overhead also adds a little. Treat the result as a close estimate.
Is 1 GB 1000 MB or 1024 MB here?
This calculator uses 1 GB = 1000 MB and 1 MB = 1,000,000 bytes, the same as hard disk makers. Windows shows sizes in 1024 units, so a file may look about 7% smaller there.
How do I make a video small enough for WhatsApp?
Put the size limit in "Target file size", enter the video length, and export at the video bitrate shown. Lower the resolution to 720p if the bitrate comes out very low.
More free tools
Wedding Video Storage Calculator
How many GB/TB a wedding shoot will need for all cameras, photos and backups — and which hard disk to buy.
Aspect Ratio & Resolution Calculator
Width and height for Reels, YouTube, 4K and cinematic 2.39:1, plus letterbox bar size.
Album Size to Pixels Calculator
Convert album sheet sizes like 12×36 into pixels at 300 DPI for Photoshop.
Course Fee Instalment Planner
Split a course fee into a token, a down payment and monthly instalments.
Learning to edit? Start with the free tutorials or see the video editing course.