Video Bitrate Calculator

How the video bitrate calculator works

Bitrate, duration, and file size are three sides of one equation. Fix any two and the third is determined. This calculator exposes that identity directly so you can solve in whichever direction you need, with the arithmetic shown for every result.

The core formula is file size (MB) = bitrate (Mbps) × duration (s) ÷ 8, where the divide-by-8 converts bits to bytes. Rearrange it to solve in any direction: bitrate = size × 8 ÷ duration for the bitrate, or duration = size × 8 ÷ bitrate for the playable length.

Audio counts too. When you enable an audio track, the calculator adds its bitrate (stereo defaults to 384 kbps) to the video bitrate before computing size. That matches how a real muxed file works — the container carries both streams, and both consume your data budget.

Why bitrate matters for AI video and uploads

Bitrate is the data budget per second of video. More bits preserve more detail in motion, texture, and gradients; fewer bits force the codec to discard information, which shows up as blocking, banding, and mushy fast motion. Getting bitrate right is the difference between a crisp clip and a smeared one.

It also governs practical limits. Platforms cap upload sizes and re-encode anything above their target, so a needlessly huge file wastes your bandwidth without improving the final stream. Knowing the target bitrate before you export saves both upload time and quality.

This matters most when you render AI video. A clip from Playcut's AI video generator comes out at a fixed resolution and frame rate, and you often need to hit a specific size for an ad platform, a client deliverable, or a storage cap. The recommended-bitrate lookup here gives you a defensible export target before you transcode.

Recommended bitrate by resolution, frame rate, and codec

The reference table inside the tool lists H.264 starting targets drawn from common platform creator guidance. Higher resolution and higher frame rate both raise the recommended bitrate, because there are more pixels and more frames to encode each second.

Codec choice changes the math. H.264 is the universal baseline. H.265 (HEVC) reaches similar perceived quality at roughly 35% lower bitrate, and AV1 at roughly 45% lower. The codec selector applies that reduction automatically, so the recommended number reflects the format you actually plan to export.

Treat every figure as a target, not a hard rule. Content complexity moves the real number — a static talking-head clip compresses far better than confetti or rain. When in doubt, start at the recommended target and adjust by eye. The numbers are date-stamped so you can re-check them against current platform docs.

The cost reality of high-bitrate AI video

Bitrate is free to compute, but the video upstream of it is not. Rendering AI video burns credits, and longer or higher-resolution clips burn more. Planning your bitrate and target length first keeps you from over-rendering footage you will only compress away.

Playcut prices on a clear credit ladder (as of 2026-05): Hobby at $9/mo with 500 credits, Pro at $29/mo with 2,000 credits, Studio at $79/mo with 6,000 credits across four seats, and Agency at $149/seat/mo with 10,000 credits per seat. Credit packs never expire — 600 credits for $9, 2,500 for $35, or 5,000 for $65.

The workflow that wastes the least: pick your delivery resolution, use this calculator to set a bitrate and size target, render the clip once in Playcut, then export at that bitrate. You spend credits on the footage you keep, not on resolution you throw away in compression.

Video bitrate calculator FAQ

How does this video bitrate calculator work?

It solves the bitrate identity in your browser. File size in megabytes equals bitrate in Mbps times duration in seconds divided by 8. Pick which value to solve for, type the other two, and it returns the third instantly with no upload.

What bitrate should I use for 1080p video?

For 1080p H.264 at 30fps or lower, common guidance is around 8 Mbps for SDR and 10 Mbps for HDR. At 48-60fps, push to roughly 12 Mbps SDR. H.265 and AV1 hit similar quality at 35-45% lower bitrate — use the codec selector to see the adjusted target.

How do I calculate video file size from bitrate?

Multiply total bitrate (video plus audio, in Mbps) by duration in seconds, then divide by 8 to convert bits to bytes. Example: 8 Mbps over 60 seconds is 8 × 60 ÷ 8, which equals 60 MB before audio. Enable the audio track to fold its bitrate into the total.

Does a higher bitrate always mean better quality?

Only up to a point. Bitrate sets the data budget per second, so more bits preserve detail and motion. Past the codec and resolution sweet spot, extra bitrate inflates file size with little visible gain. Match bitrate to resolution, frame rate, and codec.

Is this calculator free and private?

Yes. Every calculation is pure JavaScript arithmetic running locally in your browser. Nothing is uploaded, no account is required, and no file ever leaves your device.