Small rate differences can change doubling time.
This shortcut uses 7% as a simple annual growth assumption.
Supporting educational tool
How long could money take to double?
A simple way to explore how compounding changes over time.
Estimated Time to Double
10.29 years
Based on the selected annual return rate.
Growth path
Starting amount to estimated double
The chart shows a simple path from the starting amount to one estimated doubling point.
Starting Amount
Growth Path
Supporting Numbers
Annual Return
7%
Estimated Years to Double
~10.29 years
Approximate 2x Milestone
1x to 2x
How It Works
Years to double is roughly 72 divided by the yearly return rate.
Why This Matters
Key insight
At this rate, money may roughly double in about 10.29 years.
Growth can feel slow at first, then become easier to notice across longer timelines.
What is it?
What is the Rule of 72?
The Rule of 72 is a rough shortcut used to estimate how long money may take to double at a constant yearly growth rate.
Why it matters
Small changes compound
Small differences in long-term returns can dramatically change outcomes over decades.
Important note
Keep it approximate
Markets are unpredictable. This is a simplified educational estimate, and returns are never guaranteed.
Why this matters
The Rule of 72 helps turn abstract return assumptions into a rough sense of time.
Questions Worth Exploring
Questions worth exploring
Use these prompts to notice how compounding changes when time or return assumptions move.
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