The average length of a sci - fi novel is around 100,000 words. But there are many factors that can influence this. For instance, if it's a space opera with lots of different planets, species, and political systems to explain, it'll likely be longer. Whereas a more focused, character - driven sci - fi story about a single scientific discovery might be shorter. Also, different publishers may have different preferences for the length of sci - fi novels they publish.
The average length of a sci - fi novel can vary greatly. Generally, it might be around 80,000 to 120,000 words. However, some shorter ones could be as few as 50,000 words, especially those aimed at younger audiences or in a novella format. On the other hand, epic sci - fi novels can exceed 150,000 words or even more, especially if they are part of a series and need to build complex worlds and storylines.