Règle des 72
Calculez le temps nécessaire pour doubler un investissement.
Entrée
Années pour Doubler
L'investissement double en 2036
Divisez 72 par votre taux de rendement annuel pour estimer les années nécessaires pour doubler votre investissement.
Chronologie de Doublement
@ 7% rendement annuel
Comparaison des Actifs
Impact de l'Inflation
La Règle des 72 révèle aussi la vitesse à laquelle l'inflation érode le pouvoir d'achat. Avec une inflation annuelle de 3%, les prix doublent en seulement 24 ans.
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Using the Rule of 72 to Estimate Doubling Time
Aperçu
The Rule of 72 is a quick mental shortcut for how long it takes an investment to double at a fixed annual return: just divide 72 by the rate. It is remarkably accurate for typical rates and great for sanity-checking growth without a spreadsheet. This calculator applies it instantly, and also works in reverse to find the rate needed to double in a given time.
Comment utiliser (étape par étape)
- 1
Enter the annual rate
The expected yearly return or interest rate as a percentage.
- 2
Read the doubling time
The tool divides 72 by the rate to estimate years to double.
- 3
Or solve for the rate
Enter a target number of years to see what annual rate doubles your money in that time.
Comment ça marche
Years to double ≈ 72 ÷ annual interest rate (as a percent). At 8%, money doubles in about 9 years; at 6%, about 12 years. The 72 works because it closely approximates the exact logarithmic doubling formula for rates between roughly 4% and 15%. To find the required rate instead, divide 72 by the number of years you have.
Quand l'utiliser
Quickly estimating how fast savings will grow. Comparing the long-term impact of different return rates. Showing how inflation erodes purchasing power (how fast prices double).
Questions Fréquentes
Very close for rates between about 4% and 15%. At higher or lower rates the approximation drifts slightly from the exact figure, but it remains a useful estimate.
Notes Importantes
The Rule of 72 is a rough mental-math approximation, not investment advice. Real returns are not fixed and are not guaranteed — consult a licensed financial advisor before making investment decisions.