How Does Video File Size Estimation Work?

Have you ever exported a video only to find out it's way too massive to upload, or so compressed that it looks completely blurry? Digital video file size comes down to a simple mathematical rule: **Time multiplied by Bitrate equals File Size**.

Our calculator runs this math instantly behind the scenes. By adjusting the resolution and destination presets, you can see how much space your export will take up on your hard drive before you waste hours waiting for a render queue to finish.

Bitrate and Codecs Explained in Plain English

If you are new to video editing, two main things determine your video's final quality and size:

• Bitrate (The Data Flow): This is the amount of digital data processed every single second (measured in Megabits per second, or Mbps). A higher bitrate means beautiful, crisp images with less pixel blocking, but it causes the file size to balloon fast.
• Codecs (The Compression Style): Codecs are the formulas used to shrink your video. Modern streaming standards like H.264 / H.265 are incredibly smart—they squeeze your video down so it streams smoothly over mobile networks. Master archives like ProRes do almost no squeezing at all, preserving immaculate Hollywood-grade quality at the expense of massive storage loads.