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
In a 2025 story, USA TODAY explained the math behind that rule of thumb.
—
Daniel De Visé,
USA Today,
26 June 2026
The typical rule of thumb for watering most houseplants will also apply to your avocado tree.
—
Emily Hayes,
Martha Stewart,
26 June 2026
As a rule of thumb, be sure to leave your pets, booze, drones and weapons at home, and don’t forget to bring lawn chairs and blankets.
—
John Wenzel,
Denver Post,
25 June 2026
Our rule of thumb for feeling comfortable and confident on the go?
—
Julia Morlino,
Travel + Leisure,
25 June 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.
Daniel De Visé,
USA Today,
26 June 2026
The typical rule of thumb for watering most houseplants will also apply to your avocado tree.
—
Emily Hayes,
Martha Stewart,
26 June 2026
As a rule of thumb, be sure to leave your pets, booze, drones and weapons at home, and don’t forget to bring lawn chairs and blankets.
—
John Wenzel,
Denver Post,
25 June 2026
Our rule of thumb for feeling comfortable and confident on the go?
—
Julia Morlino,
Travel + Leisure,
25 June 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 29 Jun. 2026.
Copy CitationLove words? Need even more definitions?
Merriam-Webster unabridged
