Free Video Bitrate Calculator

Will this export fit under 25 MB? How long will the upload take? Work it out before you render — from any two of bitrate, size and duration.

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How it works: file size = (video bitrate + audio bitrate) × duration ÷ 8. Pick a mode, enter what you know, and get the missing number plus upload time, a bits-per-pixel quality check and an ffmpeg command. Sizes use decimal MB (1 MB = 1,000,000 bytes), the way bitrates and upload limits are counted. Estimates assume constant bitrate — real variable-bitrate exports vary with scene complexity.

I want to find out

Video bitrate (kbps)

Audio bitrate (kbps)

Duration (mm:ss or seconds)

File size (MB)

Upload speed (Mbps, optional)

Storage size (GB, optional)

Resolution (for YouTube preset)

Frame rate (fps)

Width (px)

Height (px)

Codec

Something not working?

Tell us what went wrong — it helps us fix the tool. Only what you type below is sent; your video never leaves your device.

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Feature	Free	Pro
File size / bitrate / duration, upload time, ffmpeg command	Yes	Yes
YouTube presets, bits-per-pixel check, size-limit check	Yes	Yes
Multi-clip projects: total size and storage for a whole shoot	—	Yes
Two-pass and per-platform export presets (Twitch, Vimeo, Discord)	—	Yes
Ads	Shown on page	Ad-free
Updates	—	Lifetime free updates

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Frequently asked questions

Why is my real export a different size from the estimate?

Most editors export variable bitrate (VBR): simple scenes use fewer bits, busy scenes use more, so the final size lands near — not exactly on — the constant-bitrate estimate. For a hard limit, export a short representative sample, measure its real bitrate, then re-estimate with that number and keep a margin.

What bitrate should I use for YouTube?

YouTube's own SDR upload recommendations are 8 Mbps for 1080p at 30 fps (12 Mbps at 60 fps), 5 Mbps for 720p at 30 fps, 16 Mbps for 1440p, and 35–45 Mbps for 4K at 30 fps. The preset button applies the midpoint for 4K. YouTube re-encodes everything, so these are source-file targets, not viewer stream rates.

What is bits per pixel, and why does it matter?

Bits per pixel spreads the bitrate over every pixel of every frame: bitrate ÷ (width × height × frame rate). Around 0.06–0.12 is a comfortable range for H.264 delivery; below 0.03, busy footage tends to block up. Newer codecs (HEVC, VP9, AV1) need fewer bits for the same look, which the check credits as a heuristic — not a guarantee.

MB or MiB — which one is used here?

Decimal MB (1 MB = 1,000,000 bytes), because bitrates, drive labels and upload limits are counted that way. The binary equivalent (MiB, 1 MiB = 1,048,576 bytes) is shown alongside so a file that looks "too big" in Windows Explorer makes sense.

Is my video uploaded when I drop a file here?

No. Only the file's size and duration metadata are read, in your browser, to fill in the form. The video data never leaves your device.