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.
Putting an outlet every six feet is a good rule of thumb. Lew Sichelman, Miami Herald, 5 Mar. 2026 When considering plant pairings, a good rule of thumb is to coordinate colors and contrast textures. Johanna Silver, Better Homes & Gardens, 4 Mar. 2026 As a rule of thumb, water your vegetable garden two to three times per week. Mary Marlowe Leverette, The Spruce, 4 Mar. 2026 While customs vary by destination, a good rule of thumb is $3 to $5 per night for standard hotels and $5 to $10 for luxury stays. Iona Brannon, Travel + Leisure, 3 Mar. 2026 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

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Cite this Entry

“Rule of thumb.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/rule%20of%20thumb. Accessed 13 Mar. 2026.

Kids Definition

rule of thumb

1
: a method based on experience and common sense
2
: a general principle that is roughly correct
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