Calculadora da Regra de 72 Grátis
Use a Regra de 72 para estimar em quanto tempo seu dinheiro dobrará de valor. Insira a taxa de juros e obtenha o resultado instantaneamente.
%
Years to Double
9.0
Exact Years (ln2/r)9.01
Years to Double vs Annual Interest Rate
Formula
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%.
Exemplo Resolvido
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
Perguntas Frequentes
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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