A rule of thumb

usgb
noun

A simple, practical method or guideline, usually based on experience rather than theory.

As a rule of thumb, it's safe to assume that most people don't like unsolicited advice.
Visual representation of "a rule of thumb" - A simple, practical method or guideline, usually based on experience rather than theory.

Often appears as...

  • as a rule of thumb
  • general rule of thumb

Usage tips

Idiomatic

Definition 1 of 1
Visual representation of "a rule of thumb"
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Not Precise

The phrase implies a general approach and is not meant for situations requiring accuracy or scientific measures.

Illustration for Not Precise
A rule of thumb for cooking pasta is to use one liter of water per 100g of pasta, but adjust as needed.
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Experience-Based

The guideline mentioned is often derived from someone's experience rather than official rules.

Illustration for Experience-Based
A rule of thumb in business is to always follow up with clients within 24 hours.
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Common Usage

It's widely used in everyday English conversations and is familiar to most native speakers.

Illustration for Common Usage
As a rule of thumb, fill your car's gas tank when it reaches a quarter full.
Visual representation of the word "A rule of thumb"

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