Rule of 72 Investment Doubling Calculator

Estimate how long it takes for your investment to double with compound interest, or find the rate required to meet your goals.

{{ rate }}%
0.5% 15% 30%
{{ years }} Years
1 Year 25 Years 50 Years

{{ mode === 'time' ? 'Estimated Time to Double' : 'Required Annual Return' }}

{{ mainResult }}{{ mode === 'time' ? 'yrs' : '%' }}

*Based on the Rule of 72 formula

Account for Inflation Pro
Avg. Inflation (%) {{ inflationRate }}%

Real value of your doubled capital after {{ mode === 'time' ? mainResult : years }} years will be approximately ${{ inflationAdjustedValue }} (purchasing power in today's money, assuming $100 starting value).

Compound Growth Curve

Market Benchmarks

Interest Rate Years to Double
{{ benchmark.rate }}% {{ (72 / benchmark.rate).toFixed(1) }}

Scenario Planner

No scenarios saved yet. Add your first one!
{{ scenario.label }}
{{ scenario.value }}% ROI
Doubles in
{{ scenario.result }} yrs