Compound Interest Calculator

Investment Parameters

Initial Investment ($)

Monthly Contribution ($)

Annual Return Rate (%)

Time Period (Years)

Months

Your Investment Growth

Final Balance

Fill in fields to calculate

After --

Total Contributions

Money you put in

Total Interest Earned

Your money working for you

Wealth Multiplier

How much your money grew

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Growth Visualization

Year-by-Year Breakdown

How It's Calculated

Monthly Compounding: Balance = Previous Balance × (1 + Annual Rate ÷ 12) + Monthly Contribution

Total Interest: Final Balance - Total Contributions

Wealth Multiplier: Final Balance ÷ Total Contributions

Calculations assume returns compound monthly and contributions are made at the end of each month.

Why Compound Interest Matters

Time is your greatest asset

Start Early

Every year you delay costs you exponentially. A 22-year-old investing $500/month at 7% will have $1.1M by 65. Start at 32? Only $560k.

Consistency > Timing

Regular contributions beat trying to time the market. Dollar-cost averaging smooths out volatility and builds discipline.

Reinvest Returns

Let dividends and interest compound automatically. Don't spend your returns - let them generate more returns.

Tax-Advantaged Accounts

401(k)s and IRAs let you compound tax-free or tax-deferred. This dramatically accelerates growth over taxable accounts.

The Magic of Compound Interest