Kostenloser 72er-Regel-Rechner
Schaetzen Sie ab, wie lange es dauert, Ihr Geld bei einem bestimmten Zinssatz zu verdoppeln, mithilfe der 72er-Regel.
%
Years to Double
9.0
Exact Years (ln2/r)9.01
Years to Double vs Annual Interest Rate
Formel
The Rule of 72
Years to Double ≈ 72 / Interest Rate
This is an approximation. The exact formula is:
Years = ln(2) / ln(1 + r)
The Rule of 72 is most accurate for rates between 6% and 10%.
Lösungsbeispiel
Your investment earns 8% annually.
- 01Rule of 72: 72 / 8 = 9.0 years
- 02Exact: ln(2) / ln(1.08) = 0.6931 / 0.07696 = 9.01 years
Häufig Gestellte Fragen
Why is it called the Rule of 72?
72 is used because it is easily divisible by many common interest rates (1, 2, 3, 4, 6, 8, 9, 12) and provides a close approximation.
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