Rule Of 72 Calculator

How to use it

1. {'step': 1, 'description': 'Apply Rule of 72 formula', 'calculation': '72 ÷ 8 = 9 years'}
2. {'step': 2, 'description': 'Verify with current compound formula', 'calculation': '(1.08)^9 = 1.999 ≈ 2x'}

Common mistakes

• ⚠️ Using Rule of 72 for very high interest rat is (becom is less accurate)
• ⚠️ Not adjusting for inflation when calculating current doubling time
• ⚠️ Forgetting that the rule assums compound interest, not simple

Worked example

Estimating how long it tak is to double money at 8% annual return using the Rule of 72.

At {tasa_interes}% return, your investment will double in approximately anos_duplicar of {anos_duplicar} years.

Input guide