Segment Loudness Average Calculator
Combine the loudness of up to three programme segments into the correct overall LUFS using duration-weighted power averaging — not a misleading dB average.
Loudness values are logarithmic, so you can't average them arithmetically: a 12-min segment at −23 plus 3 min at −19.5 is NOT −21.3. Converting to mean-square power, weighting by duration, then back to LUFS gives the value an EBU-mode meter would read over the whole file (gating aside).
Rule / Formula
Note: Exact integrated loudness also applies gating across the whole programme; for typical content this duration-weighted estimate is within a fraction of an LU.
Combine the loudness of up to three programme segments into the correct overall LUFS using duration-weighted power averaging — not a misleading dB average.
About Segment Loudness Average Calculator
Combine the loudness of up to three programme segments into the correct overall LUFS using duration-weighted power averaging — not a misleading dB average. Loudness values are logarithmic, so you can't average them arithmetically: a 12-min segment at −23 plus 3 min at −19.5 is NOT −21.3. Converting to mean-square power, weighting by duration, then back to LUFS gives the value an EBU-mode meter would read over the whole file (gating aside).
How to use Segment Loudness Average Calculator
- 1Enter your values into the fields in Segment Loudness Average 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 Segment Loudness Average Calculator?
- ✓Runs entirely in your browser with instant, private results — no data leaves your device.
- ✓Built on a published reference: ITU-R BS.1770-4 (mean-square loudness definition).
- ✓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 Segment Loudness Average Calculator do?+
Combine the loudness of up to three programme segments into the correct overall LUFS using duration-weighted power averaging — not a misleading dB average. Loudness values are logarithmic, so you can't average them arithmetically: a 12-min segment at −23 plus 3 min at −19.5 is NOT −21.3.
Is my data private?+
Yes. Segment Loudness Average Calculator runs entirely in your browser — your inputs are never uploaded, stored or logged.
What standard or source is Segment Loudness Average Calculator based on?+
It follows ITU-R BS.1770-4 (mean-square loudness definition). Always confirm against the current official document, as specifications and rates can change.
What formula does it use?+
Segment Loudness Average Calculator uses: L = −0.691 + 10·log₁₀( Σ dᵢ·10^((Lᵢ+0.691)/10) / Σ dᵢ ). The tool shows this formula with your own numbers substituted so you can verify the result.
Is Segment Loudness Average 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 Segment Loudness Average Calculator on your website
Want Segment Loudness Average 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/segment-loudness-average-calculator" width="100%" height="640" style="border:1px solid #e5e7eb;border-radius:12px;max-width:680px" title="Segment Loudness Average Calculator — ToolJolt" loading="lazy"></iframe>Related Broadcast tools
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