Your Numbers
Starting Amount Your down payment or initial investment
Monthly Contribution
Annual Rate of Return
%
Time Horizon
20 years
10.3
years to double
The Rule of 72
At 7.0%, your $50,000 doubles to $100,000 in approximately 10.3 years. Simply divide 72 by the rate — no calculator needed. It's a quick mental shortcut used by investors and advisors everywhere.
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Projected Value at 20 Years
—
Total Contributed (incl. monthly)
—
Growth (Interest/Gains)
—
Growth Multiple
What-If Rate Comparison at 20 Years
3%
Years to double24.0 yrs
Projected value—
5%
Years to double14.4 yrs
Projected value—
7%
Years to double10.3 yrs
Projected value—
10%
Years to double7.2 yrs
Projected value—
Applied to real estate: A home appreciating at 4% doubles in value in approximately 18 years. Your down payment — the leveraged piece — can grow even faster as a percentage return because you control the full asset value with a fraction of it in equity. A $50,000 down payment on a $350,000 home that appreciates to $700,000 represents a 13× return on your actual cash invested, even though the property only doubled.
Growth Curves — All Rates Over Selected Horizon