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In the United States, The 100 is shown on The CW. For ratings of The 100 airing in the United Kingdom, click here. To see how the users rated the episodes on IMDb, click here

Airdays

  • Season One aired on Wednesdays 9PM following Arrow. It was part of the CW's midseason lineup.
  • Season Two aired on Wednesdays 9PM following Arrow. It was the only season during which the show was part of the CW's fall lineup
  • Season Three aired on Thursdays at 9PM following Legends of Tomorrow. It was part of the CW's midseason lineup.
  • Season Four aired on Wednesdays at 9PM following Arrow. It is part of the CW's midseason lineup

The morning after the episode airs, preliminary ratings (Nielsen ratings) are announced. Less than 24 hours after the episode aired, the final ratings are released and those are added instead of preliminary ratings.

Season One Ratings

The most watched episode in Season One was Pilot, and least watched was I Am Become Death. This season had an average of 1.85 million viewer per episode

No. Episode U.S. Viewers (in millions) Difference Adults 18-49 share Source
1 Pilot 2.73  N/A 0.9 [1]
2 Earth Skills 2.27  0.46 ↓ 0.7 [2]
3 Earth Kills 1.90 0.37 ↓ 0.6 [3]
4 Murphy's Law 1.69 0.21 ↓ 0.5 [4]
5 Twilight's Last Gleaming 1.80  0.21 ↑ 0.5 [5]
6 His Sister's Keeper 1.97 0.17 ↑ 0.6 [6]
7 Contents Under Pressure 1.88 0.09 ↓ 0.6 [7]
8 Day Trip 1.64 0.24 ↓ 0.6 [8]
9 Unity Day 1.73 0.09 ↑ 0.6 [9]
10 I Am Become Death 1.46 0.27 ↓ 0.5 [10]
11 The Calm 1.71 0.25 ↑ 0.6 [11]
12 We Are Grounders (Part 1) 1.58 0.13 ↓ 0.6 [12]
13 We Are Grounders (Part 2) 1.68 0.10 ↑ 0.5 [13]

Season Two Ratings

The most watched episode in Season Two was Fog of War, and least watched was Rubicon. This season had an average of 1.54 million viewers.

No. Episode U.S. Viewers (in millions) Difference Adults 19-49 share Source
1 The 48 1.54 0.14 ↓ 0.5 [14]
2 Inclement Weather 1.48 0.06 ↓ 0.5 [15]
3 Reapercussions 1.68 0.20 ↑ 0.5 [16]
4 Many Happy Returns 1.75 0.07 ↑ 0.5 [17]
5 Human Trials 1.64 0.11 ↓ 0.6 [18]
6 Fog of War 1.86 0.18 ↑ 0.6 [19]
7 Long Into an Abyss 1.62 0.24 ↓ 0.6 [20]
8 Spacewalker 1.40 0.22 ↓ 0.5 [21]
9 Remember Me 1.48 0.08 ↑ 0.5 [22]
10 Survival of the Fittest 1.53 0.05 ↑ 0.5 [23]
11 Coup de Grâce 1.51 0.02 ↓ 0.5 [24]
12 Rubicon 1.36 0.15 ↓ 0.5 [25]
13 Resurrection 1.42 0.06 ↑ 0.5 [26]
14 Bodyguard of Lies 1.55 0.13 ↑ 0.5 [27]
15 Blood Must Have Blood (Part 1) 1.49 0.06 ↓ 0.5 [28]
16 Blood Must Have Blood (Part 2) 1.34 0.15 ↓ 0.4 [29]

Season Three Ratings

The most watched episode in Season Three was Wanheda (Part 1), and least watched was Nevermore. This season had an average of 1.32 million viewers.

No. Episode U.S. Viewers (in millions) Difference Adults 19-49 share Source
1 Wanheda (Part 1) 1.88 0.54 ↑ 0.7 [30]
2 Wanheda (Part 2) 1.63 0.25↓ 0.6 [31]
3 Ye Who Enter Here 1.57 0.06↓ 0.6 [32]
4 Watch the Thrones 1.32 0.25↓ 0.5 [33]
5 Hakeldama 1.36 0.04↑ 0.5 [34]
6 Bitter Harvest 1.41 0.05↑ 0.6 [35]
7 Thirteen 1.39 0.02↓ 0.5 [36]
8 Terms and Conditions 1.20 0.19↓ 0.4 [37]
9 Stealing Fire 1.23 0.03↑ 0.4 [38]
10 Fallen 1.13 0.10↓ 0.4 [39]
11 Nevermore 1.08 0.05↓ 0.4 [40]
12 Demons 1.15 0.07↑ 0.4 [41]
13 Join or Die 1.27 0.12↑ 0.4 [42]
14 Red Sky at Morning 1.13 0.14↓ 0.4 [43]
15 Perverse Instantiation (Part 1) 1.17 0.04↑ 0.4 [44]
16 Perverse Instantiation (Part 2) 1.29 0.12↑ 0.5 [45]

Season Four Ratings

The most watched episode in Season Four was TBA, and least watched was TBA. This season had an average of TBA million viewers.

No. Episode U.S. Viewers (in millions) Difference Adults 19-49 share Source
1 Echoes 1.21 0.08↓ 0.4 [46]
2 Heavy Lies the Crown 1.01 0.20↓ 0.4 [47]
3 The Four Horsemen 1.05 0.04↑ 0.4 [48]
4 A Lie Guarded 1.00 0.05↓ 0.4

[49]

5 The Tinder Box 1.02 0.02↑ 0.4 [50]
6 We Will Rise 0.98 0.04↓ 0.3 [51]
7 Gimme Shelter 0.90 0.08↓ 0.3 [52]
8 God Complex
9
10
11
12
13

See Also

The 100 TV Series

The 100 • Seasons ( OneTwoThreeFour ) • Episode GuideTranscriptsPromo Images

Production ( CastCrewBackstageMusicTitle Sequence ) • Other ( RatingsMerchandise )

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