Calculateur de la Règle de 72 Gratuit
Estimez en combien de temps votre argent doublera grâce à la règle de 72. Méthode rapide de calcul financier.
%
Years to Double
9.0
Exact Years (ln2/r)9.01
Years to Double vs Annual Interest Rate
Formule
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%.
Exemple Résolu
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
Questions Fréquentes
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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