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Broadcast Loudness: R128 vs A/85

Minus 23 or minus 24? Europe and the US measure loudness differently — the broadcast delivery rules made simple.

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EBU R 128 Loudness Checker

Drop an audio file and verify it meets EBU R 128 broadcast loudness: −23 LUFS ±0.5 LU integrated, true peak ≤ −1 dBTP — measured with BS.1770-4 in your browser.

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ATSC A/85 Loudness Checker (US TV)

Check a US television deliverable against ATSC A/85 / CALM Act: −24 LKFS ±2 dB integrated, true peak ≤ −2 dBTP.

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Dialnorm Calculator (AC-3 / Dolby)

Turn a measured programme loudness into the correct AC-3 dialnorm metadata value and see the attenuation a decoder will apply.

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Loudness Compliance Margin Calculator

Enter your measured integrated, true peak and LRA plus a standard's limits to get a single pass/fail with the exact margin on every parameter.

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Broadcast Target Re-level Calculator

Repurposing a mix between loudness standards? Pick source and destination spec — get the exact gain and the checks to re-run.

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True Peak Checker (dBTP)

Measure inter-sample true peaks (4× oversampled, BS.1770 Annex 2) and check against the −1 dBTP broadcast/streaming ceiling.

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