Audiência – Big Brother Brasil 2018 – Estreia – (22/01)
| Horário | Globo | Record | SBT |
| |22:54:00 | 23.8 | 7.0 | 10.3 |
| |22:53:00 | 25.5 | 6.9 | 10.0 |
| |22:52:00 | 26.1 | 6.7 | 9.7 |
| |22:51:00 | 26.2 | 6.9 | 9.7 |
| |22:50:00 | 27.1 | 6.8 | 9.4 |
| |22:49:00 | 27.0 | 6.8 | 9.6 |
| |22:48:00 | 26.6 | 6.7 | 10.3 |
| |22:47:00 | 26.5 | 7.0 | 10.4 |
| |22:46:00 | 26.4 | 7.4 | 10.1 |
| |22:45:00 | 26.0 | 8.0 | 10.2 |
| |22:44:00 | 25.8 | 7.8 | 10.2 |
| |22:43:00 | 25.8 | 7.6 | 9.9 |
| |22:42:00 | 25.9 | 7.7 | 10.1 |
| |22:41:00 | 26.2 | 7.5 | 10.0 |
| |22:40:00 | 27.2 | 7.3 | 10.0 |
| |22:39:00 | 27.5 | 7.0 | 10.2 |
| |22:38:00 | 28.0 | 7.2 | 9.8 |
| |22:37:00 | 30.1 | 6.9 | 8.8 |
| |22:36:00 | 30.0 | 6.9 | 8.7 |
| |22:35:00 | 30.1 | 6.7 | 8.6 |
| |22:34:00 | 30.5 | 6.6 | 8.6 |
| |22:33:00 | 30.4 | 6.7 | 8.5 |
| |22:32:00 | 30.4 | 6.7 | 8.9 |
| |22:31:00 | 30.4 | 6.4 | 8.9 |
| |22:30:00 | 30.5 | 6.3 | 8.6 |
| |22:29:00 | 31.1 | 6.7 | 8.7 |
| |22:28:00 | 31.9 | 6.2 | 8.4 |
| |22:27:00 | 31.9 | 6.4 | 8.4 |
| |22:26:00 | 32.7 | 6.7 | 8.5 |
| |22:25:00 | 34.1 | 6.6 | 8.1 |
| |22:24:00 | 35.2 | 6.3 | 7.5 |
| |22:23:00 | 41.9 | 4.8 | 6.0 |
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