Video File Size Calculator
Estimate how large a video file will be from its bitrate and running time.
Result
How to use
- Enter your values in the fields above.
- Press Calculate to see your result instantly.
- Use the Share button to copy a link to your result.
About this calculator
A video file's size is, at its core, just its data rate multiplied by how long it runs: File size = Bitrate × Duration, with bitrate (measured in kbps or Mbps, typically video plus audio streams combined) converted to bytes and the result scaled into MB or GB — the same underlying math whether the source is a phone recording, a screen capture, or a professionally encoded stream.
Video editors and streamers use this relationship constantly to plan storage and upload budgets before recording, since choosing a codec and bitrate target ahead of time — say, 8 Mbps for 1080p versus 35 Mbps for 4K — determines whether a two-hour project fits on a memory card or needs an external drive.
Content creators exporting for YouTube or client delivery, IT staff provisioning storage for video archives, and videographers estimating how much footage a camera's memory card can hold all rely on this calculation to avoid running out of space mid-shoot or mid-upload.
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