rule of thumb

American  

noun

1. a general or approximate principle, procedure, or rule based on experience or practice, as opposed to a specific, scientific calculation or estimate.

2. a rough, practical method of procedure.

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rule of thumb British  

noun

1. 1. a rough and practical approach, based on experience, rather than a scientific or precise one based on theory

   2. ( as modifier )

      a rule-of-thumb decision

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rule of thumb Cultural  

1. A practical principle that comes from the wisdom of experience and is usually but not always valid: “When playing baseball, a good rule of thumb is to put your best hitter fourth in the batting order.”

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rule of thumb Idioms  

1. A rough and useful principle or method, based on experience rather than precisely accurate measures. For example, His work with the youth group is largely by rule of thumb. This expression alludes to making rough estimates of measurements by using one's thumb. [Second half of 1600s]

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Etymology

Origin of rule of thumb

First recorded in 1685–95

Example Sentences

As a rule of thumb, every $10 rise in oil adds about five cents per pound to polyethylene, according to Morales.

From Barron's • May 12, 2026

A common rule of thumb for builder investors is buy the stocks when they trade at one-times book value and sell at two-times book value.

From Barron's • Apr. 12, 2026

As a rule of thumb, parents should only invest for college after getting their retirement savings on track.

From MarketWatch • Apr. 1, 2026

Is there a rule of thumb or a percentage of income at which entertainment spending starts to meaningfully impact long-term goals?

From MarketWatch • Mar. 27, 2026

“The rule of thumb is that you buy at ten and sell at twenty.”

From "The Big Short" by Michael Lewis

Related Words

• criterion