Compound Interest Calculator

📈 Compound Interest Calculator

Discover how your money can grow through the power of compound interest
💰 Initial Investment
Your initial deposit or investment
Expected yearly return
How long your money will grow
How often interest is calculated
➕ Additional Contributions (Optional)
Amount you'll add regularly
How often you'll make contributions

📊 Investment Results

Future Value (Total Amount) —
Total Interest Earned —
Total Contributions —
Effective Annual Rate (EAR) —
— Growth Multiple
— Annualized Return
— Years to Double

📅 Year-by-Year Breakdown

📋

Enter your details and click "Calculate" to see the year-by-year breakdown

🧮 Understanding Compound Interest

Compound interest is calculated on both the principal and the accumulated interest from previous periods. It's one of the most powerful forces in wealth building.

A = P × (1 + r/n)^(n×t)

Where: A = Future Value, P = Principal, r = Annual rate, n = Compounding frequency, t = Time in years

📌 The Rule of 72: Years to double ≈ 72 ÷ Interest Rate. At 8% interest, your money doubles in about 9 years.

Key Factors That Maximize Compound Growth:

  • Start early: Time is the most important factor
  • Consistent contributions: Regular investments accelerate growth
  • Higher interest rates: Even small differences compound significantly
  • More frequent compounding: Daily beats annual
  • Reinvest earnings: Never withdraw your interest

Common Mistakes to Avoid:

  • Not starting early enough
  • Withdrawing earnings (interrupts compounding)
  • Ignoring fees that reduce returns
  • Being too conservative with investments

📝 How to Use This Calculator

1
Choose your currencySelect the currency you want all figures displayed in.
2
Enter your principal amountAdd your initial deposit or investment amount.
3
Set the rate and time periodEnter your expected annual interest rate and how many years your money will grow.
4
Choose compounding frequencySelect how often interest is calculated: annually, semi-annually, quarterly, monthly, or daily.
5
Add optional contributionsEnter a recurring contribution amount and how often you'll make it, if any.
6
Click "Calculate"Review your future value, total interest earned, and the full year-by-year breakdown.

❓ Frequently Asked Questions

More frequent compounding means interest is calculated and added to your balance more often, so daily compounding will produce a slightly higher return than annual compounding at the same rate.

It's a quick way to estimate how long it takes your money to double: divide 72 by your annual interest rate. At 8% interest, your money doubles in about 9 years.

Adding money consistently means more principal is earning compound interest over time, which can significantly accelerate your total growth compared to a one-time deposit alone.

EAR reflects the true annual return once compounding is factored in, so it's often slightly higher than your stated nominal interest rate, especially with frequent compounding.

No. This calculator assumes a constant interest rate for the entire period, but actual investment returns fluctuate, so use this as a planning estimate rather than a guarantee.