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

The rule of thumb for emergency funds calls for three to six months’ worth of living expenses, though some advisors have called for 12 to 18 months. —Darla Mercado, Cfp®, CNBC, 4 Feb. 2025

While this rule of thumb is a bedrock of financial well-being, the ever-changing landscape surrounding retirement and the financial implications associated with preparing for this exciting stage of life can often be intimidating and potentially hazardous to navigate alone. —Alex Hunter, Kansas City Star, 22 Jan. 2025

Here’s a handy rule of thumb: Our first question should be: Did this guy have a claim to historic greatness? —Jayson Stark, The Athletic, 16 Jan. 2025

Here’s a good rule of thumb for all those, including the most credentialed of economists, who wish to consider, and perhaps challenge, the supply-sider perspective on tariffs: sit at Wanniski’s feet and listen. —Brian Domitrovic, Forbes, 11 Jan. 2025

Word History

First Known Use

circa 1658, in the meaning defined at sense 1

Kids Definition

rule of thumb

1

: a method based on experience and common sense

2

: a general principle that is roughly correct