Rule of 70

Topic

The Rule of 70 is a simplified mathematical formula used in finance and economics to estimate the doubling time of an investment or population growing at a constant rate. It is calculated by dividing 70 by the percentage growth rate per period, providing a quick mental approximation of exponential growth. Along with the closely related Rule of 72 and Rule of 69.3, it serves as a practical alternative to complex logarithmic calculations.