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A broadly useful principle or guideline based on experience rather than theory.
A good rule of thumb for cooking pasta is to use 1 liter of water for every 100 grams of pasta.
This means it's a practical tip based on common experience.
The rule of thumb in real estate is location, location, location.
This emphasizes that the most important factor in property value is where it's situated.
Often used to describe advice that is helpful but not strictly scientific or exact.
Use this idiom when you want to emphasize that a piece of advice is practical and based on common experience, but not scientifically proven or exact. It’s ideal for everyday situations like cooking, budgeting, or time management.
Remember that a 'rule of thumb' is a guideline, not a strict rule. Always consider exceptions or specific circumstances where the advice might not apply.
First recorded in the 17th century, the phrase likely originates from the use of the thumb as a rough measure (e.g., the width of a thumb approximating an inch). The idiom metaphorically extends this idea to any practical, experience-based guideline.
Commonly used in everyday speech and writing to introduce advice that is practical but not absolute. Avoid using it in formal or technical contexts where precision is required.