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.
As a rule of thumb, auditors recommend two years of preparation time before a reporting deadline hits. Sophia Mendelsohn, Forbes.com, 4 Apr. 2025 But as a rule of thumb, if the weather is clear, the best aurora is usually visible within an hour or two of midnight, according to NOAA. Eric Lagatta, USA TODAY, 22 Mar. 2025 As a rule of thumb, novice golfers do well with compression lower than 70, while intermediate prefer compression rates of 70 to 80. Bestreviews, The Mercury News, 13 Mar. 2025 The rule of thumb for a Recession is two sequential negative GDP quarters. Robert Barone, Forbes.com, 31 Mar. 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 19 Apr. 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!