Rule of thumb

noun

Definitions

1.nounA general guideline, rather than a strict rule; an approximate measure or means of reckoning based on experience or common knowledge.

"The usual rule of thumb says that to calculate when an investment will double, divide 70 by the interest rate."

2.noun(usually hyphenated) Approximated, guesstimated.

"I made a quick, rule-of-thumb estimate of the manhours required for the job."

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