FinMango Rule of 72 💰 Calculator

Rule of 72

The rule of 72 is a popular formula used to roughly estimate how long it will take for your investments to double in time assuming a constant rate of return.

The formula is extremely simple! Just take the number 72 and divide it by the interest rate that you hope to earn from your investments.

We'll now ask you a few questions about your personal finances to show you that, even with modest initial savings, you can build a significant amount of wealth.

Do you have any investments?

Total Invested Amount Total money invested in stock market, 401K, etc.

Expected Investment Annual Return Rate The average stock market return for a 10-year period is 9.2% per year.

Doubling Time

With the expected annual return rate, the rule of 72 lets you estimate that your investments will double every 72 ÷ {{ Number(this.investments_rate).toFixed(2) }} = {{ Formatter.years(72 / Number(this.investments_rate)) }} years.

Now let's watch what happens when we take advantage of compounding interest...