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

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

Living Area Weekly Cleaning Musts While everyone’s cleaning routine will look different based on their space and household, cleaning high-traffic areas such as the living room that are used daily is a good rule of thumb to stay on top of clutter and grime. —Mary Marlowe Leverette, The Spruce, 12 Jan. 2026

Yet this strategy can be abstract, which is why Funk offers a simple rule of thumb. —Lauren Dana Ellman, Travel + Leisure, 9 Jan. 2026

Some advisors ascribe to a 10% rule of thumb — meaning no one stock or asset should make up more than 10% of a portfolio. —Hayley Cuccinello, CNBC, 9 Jan. 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
• succumb
• therefrom
• wherefrom
• bum
• chum
• come

Kids Definition

rule of thumb

1

: a method based on experience and common sense

2

: a general principle that is roughly correct