Target Bitrate for File Size Calculator
Have a hard size cap? Enter the cap, duration and audio bitrate to get the exact video bitrate to encode at.
To make a 45-minute video fit 700 MB you have ~2,120 kbit/s total; reserve 192 for audio and encode video at ~1,925 kbit/s (a 2-pass CBR target). This is the classic 'fit it on this disc / under this upload limit' calculation — solve for bitrate, not the other way round.
Rule / Formula
Have a hard size cap? Enter the cap, duration and audio bitrate to get the exact video bitrate to encode at.
About Target Bitrate for File Size Calculator
Have a hard size cap? Enter the cap, duration and audio bitrate to get the exact video bitrate to encode at. To make a 45-minute video fit 700 MB you have ~2,120 kbit/s total; reserve 192 for audio and encode video at ~1,925 kbit/s (a 2-pass CBR target). This is the classic 'fit it on this disc / under this upload limit' calculation — solve for bitrate, not the other way round.
How to use Target Bitrate for File Size Calculator
- 1Enter your values into the fields in Target Bitrate for File Size Calculator.
- 2The result and any pass/fail verdict update instantly as you type — no button to press.
- 3Check the substituted formula and worked example to see exactly how the result was derived.
- 4Copy or note the result for your spec, delivery or planning.
Why use Target Bitrate for File Size Calculator?
- ✓Runs entirely in your browser with instant, private results — no data leaves your device.
- ✓Built on a published reference: 2-pass encoding / bitrate budgeting.
- ✓Shows the governing formula and a worked example, so you can trust and check every result.
- ✓100% free with no sign-up, no watermark and no usage limits.
- ✓Works on any device — desktop, tablet or phone — and keeps working offline once loaded.
Frequently asked questions
What does Target Bitrate for File Size Calculator do?+
Have a hard size cap? Enter the cap, duration and audio bitrate to get the exact video bitrate to encode at. To make a 45-minute video fit 700 MB you have ~2,120 kbit/s total; reserve 192 for audio and encode video at ~1,925 kbit/s (a 2-pass CBR target).
Is my data private?+
Yes. Target Bitrate for File Size Calculator runs entirely in your browser — your inputs are never uploaded, stored or logged.
What standard or source is Target Bitrate for File Size Calculator based on?+
It follows 2-pass encoding / bitrate budgeting. Always confirm against the current official document, as specifications and rates can change.
What formula does it use?+
Target Bitrate for File Size Calculator uses: total kbit/s = sizeMB × 8192 ÷ seconds; video bitrate = total − audio bitrate. The tool shows this formula with your own numbers substituted so you can verify the result.
Is Target Bitrate for File Size Calculator free to use?+
Yes — it is completely free with no account, no sign-up and no usage limits. There is no watermark and no paywall.
Embed Target Bitrate for File Size Calculator on your website
Want Target Bitrate for File Size Calculatoron your own site? Paste this snippet into any HTML page — it's free, with no API key or sign-up. The tool loads in an iframe and keeps working exactly as it does here.
<iframe src="https://tooljolt.com/tools/target-bitrate-for-size-calculator" width="100%" height="640" style="border:1px solid #e5e7eb;border-radius:12px;max-width:680px" title="Target Bitrate for File Size Calculator — ToolJolt" loading="lazy"></iframe>Related Broadcast tools
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