Idiom
rules of thumb
Meanings
A simple, general guideline used to make a quick decision or estimate.
Definition
“Rules of thumb” are simple, practical guidelines that help you make decisions without exact measurement or full information.
“Rules of thumb” are general tips or methods that usually work in many situations. They are not exact laws, but they are useful when you need a quick, reasonable answer. People use rules of thumb in everyday life, work, and learning to guide choices when details vary.
Examples
- As a rules of thumb, I reply to emails within 24 hours.
- One of my rules of thumb is to save at least 10% of every paycheck.
- In interviews, a helpful rules of thumb is to prepare three stories about your work.
- For budgeting, my rules of thumb is to track spending for a month before cutting costs.
Common mistake
Learners often say “a rules of thumb” instead of “a rule of thumb” (singular) or “rules of thumb” (plural).