rule of thumb

noun phrase

1
: a method of procedure based on experience and common sense
2
: a general principle regarded as roughly correct but not intended to be scientifically accurate

Examples of rule of thumb in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Avid Travel + Leisure readers already know that this rule of thumb also applies to build-it-yourself tiny homes. Amelia McBride, Travel + Leisure, 28 Sep. 2025 Because as temperatures drop and the leaves change, so does the rule of thumb. Andrew Callahan, Boston Herald, 25 Sep. 2025 As a rule of thumb, expect to save 20-40% compared to new, depending on the brand, age and condition. Kurt Knutsson, FOXNews.com, 20 Sep. 2025 My rule of thumb is to use productivity gains to ship more ideas faster and show the team exactly how roles can evolve. Daniel Jebaraj, Forbes.com, 18 Sep. 2025 See All Example Sentences for rule of thumb

Word History

First Known Use

circa 1658, in the meaning defined at sense 1

Time Traveler
The first known use of rule of thumb was circa 1658

Browse Nearby Words

Cite this Entry

“Rule of thumb.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/rule%20of%20thumb. Accessed 1 Oct. 2025.

Kids Definition

rule of thumb

1
: a method based on experience and common sense
2
: a general principle that is roughly correct
Last Updated: - Updated example sentences
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!