Off-based isn’t a standard phrase. You might mean based off, which is informal and often incorrect in formal contexts.
Key takeaways:
Based on is the correct and formal phrase, used to describe something derived from a source or reference.
Based off is often used informally, primarily in spoken American English, but is generally considered incorrect in formal writing.
Use based on in most contexts, especially in professional, academic, or formal writing.
Based off tends to be used in informal speech but avoided in written communication.
Part of the series “Grammar Debugged—English for Devs”
Language is full of subtle nuances, and understanding the differences between similar phrases can help you communicate more clearly and accurately. One common source of confusion is the difference between based on and based off. Though they are often used interchangeably, one is more appropriate than the other in different contexts. In this Answer, we’ll explore the distinction between these two phrases, when to use each one, and highlight common mistakes people make.
Based on is used to indicate that something is founded on or grounded in a particular idea, source, or concept. It is more formal and is used to refer to facts, theories, or sources of information that something is directly built upon.
Examples
The movie is based on a true story.
Her research is based on years of data analysis.
The design was based on modern architectural principles.
Key Point: Use “based on” when referring to sources, foundations, or inspiration for something.
Use “based on” when referring to something that is grounded in a specific reference, fact, or idea.
Based off (often written as based off of) is an informal variation, most commonly heard in spoken American English. It is considered less formal and is generally used when trying to imply that something is derived from something else. However, in professional writing, based off is often viewed as incorrect.
Examples
The movie was based off of a popular comic book.
The game was based off a true story.
His idea was based off our previous discussion.
Use “based off” in informal, conversational contexts (primarily in spoken American English), but avoid it in formal writing.
Mistake 1: Using based off in formal writing
Incorrect: The novel is based off a real event.
Correct: The novel is based on a real event.
Mistake 2: Mixing based on and based off in the same sentence
Incorrect: The design is based on inspiration based off nature.
Correct: The design is based on inspiration from nature.
Key aspect | Based on | Based off |
Definition | Derived from, grounded in, or influenced by a source | Derived from or loosely based on something (informal) |
Usage | Formal, standard usage in writing and speech. | Informal, often used in spoken American English. |
Contexts | Professional, academic, formal writing, and speech. | Casual conversations, informal speech. |
Example | The documentary is based on historical facts. | The movie is based off a popular book series. |
Fill in the blanks with either based off or based on to test your understanding!
The movie is __________ a true story.
based off
The artwork was __________ a dream the artist had.
based on
The video game was __________ a popular comic book series.
The book is __________ real-life experiences, but with some fictional elements
The TV show is __________ a real historical event.
Check out our course on “Grokking the Technical Writing Process,” which will provide insights into technical writing, audience analysis, creating coherent paragraphs, iterative improvement, and mastering parts of speech and punctuation for impactful and well-structured communication.
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To enhance technical writing and minimize common grammar mistakes, continue exploring these topics:
Commonly confused words (homophones & similar-sounding words): These words sound alike but have different meanings and spellings.
Prepositions & usage differences: These words and phrases are often confused due to subtle contextual differences.
Punctuation & formatting: These involve rules for using dashes, abbreviations, and sentence structure.
Grammar & sentence structure: These deal with pronoun choices, verb usage, and comparison.
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