What is how many words should a intro paragraph be?

An introductory paragraph should generally be between 3-5 sentences or roughly 50-150 words. The ideal length often depends on the overall length and complexity of the essay or document it introduces. The main function of your intro paragraph is to introduce the main topic and your argument (if applicable). It should be concise enough to keep the reader engaged but thorough enough to provide necessary background information and set the stage for the rest of your writing. The thesis statement which is typically the last sentence in the paragraph, guides the reader.