🎯 Rule of 72 Calculator

What is the Rule of 72?

The Rule of 72 is a quick formula to estimate how long it takes for an investment to double. Divide 72 by the annual return rate to get the approximate years to double.

📐 Rule of 72 Formula

Years to Double = 72 ÷ Annual Rate(%)

Example: 72 ÷ 8% = 9 years

复利计算器

0%10%20%
1y25y50y
Used for the "this year vs last year" simulation.
总投资额
¥780,000.00
总利息收入
+¥1,025,104.00
最终金额
¥1,805,104.00

增长图表

You vs Average

Benchmark: U.S. long-term average return assumed at 7%

Final gap: +¥0.00

This Year vs Last Year

Compares one-year outcomes using current and last-year return assumptions.

End-of-year difference: +¥808.00
💰

Compound Interest Result

¥1,805,104.00

Estimated interest: ¥1,025,104.00

Expected value after 20 years (7% annual return)

📢 Share with friends

Share this useful information

#CompoundInterest #Investment #Finance #WealthBuilding

什么是复利?

复利是对本金和以前期间积累的利息一起计算的利息。与仅对本金计算的单利不同,复利使您的资金随时间增长更快。

复利计算公式

A = P(1 + r/n)nt

A = P(1 + r/n)^(nt),其中A是最终金额,P是本金,r是年利率,n是每年复利次数,t是年数。

72法则

72法则是估算投资翻倍时间的简单方法。用72除以年回报率即可得到大约的年数。例如,在6%的年回报率下,您的投资将在约72÷6=12年内翻倍。

At 7% return, your investment doubles in about 10.3 years.

How to Read the Comparison Features

  • "You vs Average": See whether your assumptions outperform or underperform a U.S. long-term baseline.
  • "This Year vs Last Year": Quantify how a rate change shifts your one-year ending value under the same contribution plan.
  • Rate and term sliders update charts in real time so you can test scenarios quickly.

复利投资建议

  • 尽早开始投资以最大化复利增长
  • 定期投入,即使是小额也会积少成多
  • 将收益再投资以加速增长
  • 长期投资获得最佳结果

📊 Doubling Time by Rate

Annual RateDoubling Time4x TimeTypical Product
3%24y48ySavings
5%14.4y28.8yBonds
7%10.3y20.6yBalanced Fund
10%7.2y14.4yS&P500 ETF
12%6y12yGrowth Stocks

💡 How to Use Rule of 72

  1. Set target (e.g., 50M → 100M)
  2. Determine expected return (e.g., 7%)
  3. 72 ÷ 7 = ~10 years needed
  4. Adjust rate if timeline doesn't match
💡 Rule of 72 is most accurate for 6-10% returns. Extreme rates have larger errors.

🔢 Related Rules

  • Rule of 69.3: More accurate for continuous compounding
  • Rule of 114: Calculate time to triple
  • Rule of 144: Calculate time to quadruple

📚 各地区计算规则说明

计算逻辑

采用公开的金融、贷款、比率与单位换算标准公式。

参考范围

参考公开标准与各地区常见实务规则。

前提条件

税费、费率、上限会因地区和机构而不同。

结果解读

结果可作为基准情景。正式决策前请与当地机构报价和税务规则对比。

地区默认值

货币: CNY

单位: metric

税务模型: US payroll estimate

法规提示

本工具基于地区预设进行估算。实际合同条款与法定上限可能因机构和当地法规而不同。

建议操作

  • 正式申请前请至少比较 2~3 家本地机构方案。
  • 再次核对费用、税务处理和提前还款条款。
  • 用利率 +1~2% 与收入下降场景再测一次。

做真实决策前,请先确认当地机构的最新条款。

查看政策说明