Understanding Doubling Time & The Rule of 72
How compounding interest accelerates growth over time:
STEP 01
Enter Rate
Input expected annual return or percentage growth rate.
STEP 02
Rule of 72 Shortcut
Quick mental math: divide 72 by interest rate (72 / r).
STEP 03
Exact Logarithmic Math
Calculates continuous compounding formula ln(2) / ln(1 + r).
STEP 04
Plan Milestones
Determine when $10,000 becomes $20,000, $40,000, and beyond.