# Question: Who Invented The Rule Of 72?

Albert Einstein

## Did Albert Einstein invent the Rule of 72?

Popular belief holds that Albert Einstein once said “There is no force in the universe more powerful than compound interest,” and that he in fact invented the famous Rule of 72. The Rule of 72, as you may recall, tells us how many years are required for an investment to double, by dividing the interest rate into 72.

## Where does rule of 72 come from?

The Rule of 72 is a simple way to determine how long an investment will take to double given a fixed annual rate of interest. By dividing 72 by the annual rate of return, investors obtain a rough estimate of how many years it will take for the initial investment to duplicate itself.

## What is the difference between the rule of 70 and the Rule of 72?

The rule of 72 is a simple method to determine the amount of time investment would take to double, given a fixed annual interest rate. Instead of using the rule of 70, he uses the rule of 72 and determines it would take approximately 7.2 (72/10) years for his investment to double.

## Does the rule of 72 really work?

The Rule of 72 – Why it Works

69 by one hundred, so that the interest rate can be expressed as a percent instead of a decimal). It isn’t an estimate – it’s the exact answer for doubling your money, assuming that the interest is compounded continuously. It’s valid for any value of r.

## Does money double every 7 years?

Here’s how the Rule of 72 works:

At 10%, money doubles every 7.2 years and when you divide 7.2 by 10%, you get 72. This rule of thumb helps you compute when your money (or any unit of numbers) will double at a given interest (growth) rate.

## What did Einstein call the 8th wonder of the world?

8. Compounding interest separates the rich from the broke. The great Albert Einstein once said “Compound interest is the eighth wonder of the world. He who understands it, earns it … he who doesn’t … pays it.”

## What is Rule of 144?

Rule of 144. Like the above two rules, the rule of 144 tell investors in how much time their money or investment will quadruple. For instance, if the interest rate is 12 per cent, Rs 10,000 becomes Rs 40,000 in 12 years.

## What is the 2 rule in real estate?

The 2% rule in real estate is a rule of thumb which suggests that a rental property is a good investment if the monthly rental income is equal to or higher than 2% of the investment property price. For example, for a \$200,000 rental property, the rental income has to be at least \$4,000 to meet the 2% rule.

## Will my 401k double in 10 years?

The rule of 72 can help you build wealth without much risk

1﻿ For example: If you invest money at a 10% return, you will double your money every 7.2 years. (72/10 = 7.2) If you invest at a 7% return, you will double your money every 10.2 years.

## What will \$5000 be worth in 20 years?

How much will an investment of \$5,000 be worth in the future? At the end of 20 years, your savings will have grown to \$16,036. You will have earned in \$11,036 in interest.

## How can I double 1000 dollars fast?

If you divide 72 by the annual rate of return, it will tell you how many years it will take to double your investment. So for example, if you had an 8% rate of return, it would take 72 / 8 = 9 years to double your money. If you had a 12% rate of return, it would take 72 / 12 = 6 years to double it.

## How can I double my money in one year?

The Classic Way—Earning It Slowly

The rule of 72 is a famous shortcut for calculating how long it will take for an investment to double if its growth compounds. Just divide 72 by your expected annual rate. The result is the number of years it will take to double your money.