How is video file size calculated?

File size ≈ bitrate × duration. The tool first estimates a bitrate from resolution, frame rate, codec efficiency, and quality, then multiplies by seconds and converts bits to megabytes or gigabytes.

Which codec gives the smallest file?

AV1 is the most efficient, roughly 30–50% smaller than H.264 at equal quality, with H.265/HEVC in between. The trade-off is slower encoding and less universal playback support.

Why does my AI video file size matter?

When generating batches of clips you pay for storage and egress. Estimating size up front lets you choose a codec and resolution that keeps your storage bill predictable.

It is an estimate. Real bitrate depends on scene complexity and encoder settings — fast motion and detail push it higher than these averages. Use it for planning, not billing.

Video Resolution & Bitrate Calculator

Video resolution and bitrate calculator

When you generate AI video at scale, file size drives your storage and bandwidth bill. This calculator estimates the bitrate, file size, and streaming bandwidth for any resolution, frame rate, codec, and duration — so you can plan storage for a batch of clips before you render them.

How it works

Bitrate is the data rate of the video stream, usually in megabits per second (Mbps). It scales with the number of pixels per second and the codec’s efficiency:

pixels_per_sec = width × height × fps
bitrate ≈ pixels_per_sec × bits_per_pixel × quality / codec_efficiency
file_size = bitrate × duration

Newer codecs need fewer bits per pixel for the same quality: H.265/HEVC is about 40% more efficient than H.264, and AV1 is more efficient still. The tool applies those factors and converts the result into a human-readable file size.

Tips

Re-encode AI outputs. Models often export bloated H.264 — re-encoding to H.265 or AV1 can halve storage with no visible loss.
Match bitrate to motion. Static talking-head clips compress far smaller than fast action; treat the estimate as an average.
Mind egress, not just storage. Serving video to viewers often costs more than storing it; lower bitrate cuts both.
Cap frame rate. 24fps is plenty for cinematic AI video; 60fps nearly doubles the bitrate.