Capitalization in titles is a crucial aspect of writing that can significantly impact the readability and professionalism of your content. One of the most common questions is whether to capitalize 'is' in a title. This article will delve into the intricacies of title capitalization, focusing on the role of 'is' in titles.
Understanding Title Capitalization
Title capitalization, also known as headline style, is a specific way of capitalizing words in a title or heading. It's different from sentence capitalization, where only the first letter of the sentence is capitalized. In title capitalization, certain words are capitalized based on their role in the title, not their part of speech.
Words to Capitalize in a Title
According to the Chicago Manual of Style, the most widely used style guide in publishing, the following words should be capitalized in a title:

- The first and last words of the title
- Nouns, pronouns, adjectives, verbs, adverbs, and subordinating conjunctions
- Words of three letters or more
Capitalizing 'Is' in a Title
Now, let's address the elephant in the room - should 'is' be capitalized in a title? The answer is no, 'is' should not be capitalized in a title. 'Is' is a linking verb, which connects the subject to its complement. It's a short word and doesn't add much meaning to the title, so it's typically not capitalized.
For example, consider the title "The Cat Is on the Mat". Here, 'is' is not capitalized because it's a short word and doesn't convey much meaning. The title would be capitalized as "The Cat IS on the Mat" if 'is' was important to the title's meaning.
Exceptions to the Rule
While 'is' is usually not capitalized, there are exceptions. If 'is' is the first or last word of the title, it should be capitalized. For instance, in the title "Is the Cat on the Mat?", 'is' is capitalized because it's the first word.

Moreover, if 'is' is part of a proper noun or a phrase that's capitalized as a whole, it should be capitalized. For example, in the title "The United States Is a Federal Republic", 'is' is capitalized because it's part of the proper noun "United States".
Other Words to Consider
Besides 'is', other short words like 'an', 'and', 'the', 'a', 'in', 'of', and 'on' are typically not capitalized in a title. However, there are exceptions to this rule as well. If these words are the first or last word of the title, or if they're part of a proper noun or a capitalized phrase, they should be capitalized.
For instance, in the title "The Cat and the Mat", 'and' is not capitalized because it's a short word and not the first or last word of the title. However, in the title "The Cat and the Dog", 'and' is capitalized because it's the first word.
Tools to Help with Title Capitalization
If you're unsure about title capitalization, there are several online tools that can help. These tools use algorithms based on style guides like the Chicago Manual of Style to automatically capitalize titles. Some popular tools include:
Conclusion
Capitalizing 'is' in a title is a common question, but the answer is usually no. 'Is' is typically not capitalized in a title because it's a short word and doesn't add much meaning. However, there are exceptions to this rule, and it's important to understand these exceptions to ensure your titles are correctly capitalized.