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
As for being on time, a good rule of thumb is that on time is late and early is on time.
—
Kirk Kenney, San Diego Union-Tribune, 27 Jan. 2026
In the 150 years since Bonnet’s proof, mathematicians have discovered various kinds of surfaces that defy his rule of thumb.
—Elise Cutts, Quanta Magazine, 20 Jan. 2026
Non-Enameled Cast Iron As a rule of thumb, pots, pans, and skillets composed of non-enameled cast iron are best kept out of the dishwasher.
—Caroline Biggs, Martha Stewart, 16 Jan. 2026
While a once-a-week watering schedule is a good rule of thumb, the correct amount of water and frequency of watering depend on factors such as air temperature, humidity, the amount of light the plant receives, and the type of soil it’s planted in.
—Leanne Potts, Better Homes & Gardens, 13 Jan. 2026
See All Example Sentences for rule of thumb
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.
Kirk Kenney, San Diego Union-Tribune, 27 Jan. 2026
In the 150 years since Bonnet’s proof, mathematicians have discovered various kinds of surfaces that defy his rule of thumb.
—Elise Cutts, Quanta Magazine, 20 Jan. 2026
Non-Enameled Cast Iron As a rule of thumb, pots, pans, and skillets composed of non-enameled cast iron are best kept out of the dishwasher.
—Caroline Biggs, Martha Stewart, 16 Jan. 2026
While a once-a-week watering schedule is a good rule of thumb, the correct amount of water and frequency of watering depend on factors such as air temperature, humidity, the amount of light the plant receives, and the type of soil it’s planted in.
—Leanne Potts, Better Homes & Gardens, 13 Jan. 2026
See All Example Sentences for rule of thumb
Cite this Entry
“Rule of thumb.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/rule%20of%20thumb. Accessed 27 Jan. 2026.
Copy CitationLove words? Need even more definitions?
Merriam-Webster unabridged
