Rule of 72 Calculator

Quickly estimate the time to double an investment

Annual Interest Rate (%)

≈ 12.0 years

72/r

12.00

70/r

11.67

69.3/r

11.55

Exact

11.8957

Growth Milestones

2x

11.9 yr

4x

23.8 yr

8x

35.7 yr

16x

47.6 yr

32x

59.5 yr