About This Tool
What is Compound Interest Calculator?
A tool for calculating compound interest effects with initial principal and monthly contributions. Predict future investment value and view year-by-year growth trends. Useful for financial planning.
How to Use
- Enter the initial investment amount.
- Enter the monthly contribution.
- Set the annual interest rate and investment period.
- Click 'Calculate' to view final amount, total contributed, and total interest.
Key Features
- Compound interest calculation
- Monthly contribution included
- Year-by-year balance breakdown
- Total investment vs. interest comparison
Tips
- Compound interest, often called the 'eighth wonder of the world,' becomes powerful over long investment periods.
- The longer the investment period, the more exponentially compound interest grows.
- At 7% annual return, your investment approximately doubles in about 10 years.
Compound Interest Calculator
Calculate future value with initial principal and monthly contributions
Frequently Asked Questions
单利和复利有什么区别？▼
单利只在原始本金上计算。复利在本金加所有已累积利息上计算——'利滚利'。长期来看，复利呈指数增长而单利呈线性增长。例如1万美元7%利率30年：单利21,000美元，复利76,123美元。
每月定投的影响有多大？▼
由于定期定额和复利增长，每月定投影响巨大。1万美元7%利率20年一次性投资增长到38,697美元。但加上每月200美元增长到142,000美元以上——近4倍，尽管总投入仅58,000美元。
这些计算是税前还是税后的？▼
显示的是税前（总额）数字。利息/资本利得税后实际收益会更低，税率因国家和账户类型而异。税收优惠退休账户（401k、IRA等）可减轻或延迟税收影响。精确的税后预测请咨询理财顾问。