i feel like every single dissertation student at some point has sat there staring at their literature review wondering how long should a literature review be and feeling completely lost because the answers you find online are either too vague or completely contradict each other i've been there and it's one of those questions that sounds so simple but genuinely causes more stress than it should so let me just break it down in a way that actually makes sense.
the most reliable answer is that your literature review should sit at around 20 to 30 percent of your total dissertation word count and that applies across most UK universities at both undergraduate and masters level. so if you're writing a 10,000 word dissertation you're looking at roughly 2,000 to 3,000 words for your literature review and if you're at masters level working with a 15,000 to 20,000 word dissertation that number climbs to somewhere between 3,000 and 6,000 words. but here's what i really want you to take away from understanding how long should a literature review be — the percentage is a guide not a rule and your module handbook should always be your first port of call because some universities and some subjects have very specific expectations that override the general guidance.
what trips most students up is confusing length with quality and they are absolutely not the same thing i have seen literature reviews that were 4,000 words of pure padding where the student just summarised source after source with zero critical analysis and i have seen 2,000 word literature reviews that were absolutely surgical in how they engaged with the existing research and built a compelling case for the dissertation's research question. when you're thinking about how long should a literature review be the better question running alongside that should be whether every single paragraph is pulling its weight and actually contributing to your overall argument.