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

But for the moment, the best rule of thumb is to get the room as dark as possible, these studies suggest. — Veronique Greenwood, Time, 11 Sep. 2026

Broadly, the rule of thumb is to drink it during periods of intense competition (to allow for muscle recovery) while avoiding it during periods of training (to promote muscle development). — Jacob Whitehead, New York Times, 8 Sep. 2026

Pausing midway through a meal to check in with your hunger is a good rule of thumb, and boxing half of a meal at a restaurant to bring home can also help. — Gavin Escott, USA Today, 3 Sep. 2026

This is generally the rule of thumb for this time of year, and there hasn’t been anything particularly abnormal about this summer, Bonnette said. — Brayden Garcia, Fort Worth Star-Telegram, 24 Aug. 2026

Word History

First Known Use

circa 1658, in the meaning defined at sense 1

Rhymes for rule of thumb

• abomasum
• become
• checksum
• humdrum
• income
• outcome
• pisum
• succumb
• therefrom
• wherefrom
• bum
• chum

Kids Definition

rule of thumb

1

: a method based on experience and common sense

2

: a general principle that is roughly correct