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Rule of 70

Written by the Fiveable Content Team • Last updated August 2025
Verified for the 2027 exam
Verified for the 2027 examWritten by the Fiveable Content Team • Last updated August 2025

Definition

The Rule of 70 is a mathematical formula used to estimate the doubling time of a growing quantity based on its annual growth rate. It provides a quick way to determine how long it takes for a population or any other quantity to double in size.

AP course connection

Topic 3: Unit 3 Overview: Populations

Unit 3

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