Idiom
rules of thumb
Meanings
A simple practical guideline based on experience, used as a rough standard rather than an exact rule.
Definition
Rules of thumb are simple, practical guidelines that work well in most situations but are not exact.
Rules of thumb are general guidelines people use to make quick decisions or estimates. They come from experience rather than strict rules or scientific precision. They are useful when you do not have complete information, but they may not fit every situation.
Examples
- As a rule of thumb, save at least 10% of your income each month.
- One of my rules of thumb is to reply to important emails within 24 hours.
- These rules of thumb are helpful, but they won’t cover every case.
- A good rule of thumb for cooking pasta is to use plenty of salted water.
- We used a few rules of thumb to estimate the project timeline.