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A rule of thumb is an easy-to-remember guideline that isn't necessarily a hard-and-fast rule or scientific formula but it's more than just a dumb guess. For centuries rule of thumb has been used as an estimated measurement by many craftsmen including carpenters, brewers, and tailors. The term referred generally to the length of the thumb from the joint to the tip, approximately an inch.
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A Rule of thumb is a procedure based on experience and common sense. It can also be used to refer to a general principle regarded as roughly correct but not intended to be scientifically accurate.
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