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

MicroCo’s rule of thumb is that a show must hook a viewer within 3 seconds (give or take a few seconds). —Todd Spangler, Variety, 11 June 2026

There is no magic amount to use, but as a rule of thumb, two spritzes directly to the skin should always be plenty—sometimes too much. —Kaitlyn Yarborough, Southern Living, 10 June 2026

The repair cost is relatively low A common rule of thumb used by HVAC professionals is to compare the repair cost to the value and age of the system. —Angelica Leicht, CBS News, 9 June 2026

The variations are endless, but like certain dance steps, there are a few rules of thumb to follow to create the perfect bite. —Lynda Balslev, Mercury News, 9 June 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