Video File Size Calculator

A video file size calculator is an essential utility for video editors, social media content creators, streamer broadcasters, and video recording engineers. Calculating how large your files will be before exporting or recording prevents system out-of-memory crashes, ensures you comply with platform upload constraints, and optimizes network bandwidth.

Unlike simple calculators, our tool analyzes the relationship between raw pixel dimensions, frames per second (FPS), compression codecs, and the target bitrate. Because video encoders do not store every individual pixel of every single frame, the final output size is determined by the bitrate (amount of data encoded per second) rather than the resolution alone.

To calculate the size of your video export, follow these simple steps using the calculator inputs:

1. Select a Platform Preset or choose a custom configuration to match your editing timeline.
2. Adjust the Target Video Bitrate in Mbps or Kbps. You can use standard recommendation markers matching YouTube or Twitch targets.
3. Configure the Audio Bitrate. High-quality audio typically ranges from 128 Kbps to 320 Kbps.
4. Input the Duration of your clip in hours, minutes, and seconds.
5. Read the Live Results in the preview layout, showing total gigabytes, bitrate density warnings, and platform limits.

The target bitrate is the single most important factor determining your estimated file size. While higher resolutions like 4K UHD and framerates like 60 FPS require higher bitrates to avoid compression blockiness, a 1080p video set to an excessively high bitrate will result in a huge file with no visible increase in quality on typical consumer screens.

Social media platforms like YouTube, Instagram, and TikTok re-encode uploaded videos to fit their own delivery bitrates. If you upload a video with a bitrate far higher than recommended, the platform will compress it heavily anyway, meaning you wasted hours of upload time and bandwidth.

Compression codecs are algorithms that pack video data. Choosing the right codec is critical:

• H.264 (AVC): The most widely supported video codec. It is compatible with almost every device and browser, but requires a higher bitrate to prevent compression artifacts.
• HEVC (H.265): High-Efficiency Video Coding. It reduces the required bitrate by approximately 30-40% compared to H.264 while retaining identical quality, making it ideal for 4K video exports.
• AV1: Next-generation open-source codec. It offers up to 50% more efficiency than H.264 and is heavily utilized by YouTube and Netflix for stream delivery.
• Apple ProRes 422: An editing intermediary codec. It does not perform heavy spatial compression to speed up editing timelines, resulting in massive, high-fidelity files.