Compound Interest Calculator
Calculate investment growth over time
How to Use
Enter initial investment
Input your starting amount or current savings.
Add monthly contribution
Enter how much you plan to add each month (optional).
Set rate and duration
Enter expected annual return rate and investment period in years.
View growth projection
See your final balance, total contributions, and interest earned with year-by-year breakdown.
Frequently Asked Questions
What is compound interest?
Compound interest is interest calculated on both the initial principal and the accumulated interest from previous periods. It allows your money to grow exponentially over time.
How does compound frequency affect my returns?
More frequent compounding (monthly vs annually) results in slightly higher returns because interest starts earning interest sooner. The difference is more significant with higher interest rates.
What is a realistic annual return rate?
Historical stock market returns average around 7-10% annually after inflation. Savings accounts typically offer 0.5-5%. High-yield bonds may offer 5-8%.
Is this calculator accurate for retirement planning?
This provides a good estimate, but real returns vary year to year. For serious retirement planning, consider using specialized tools that account for inflation and variable returns.
Related Tools
BMI Calculator
Calculate Body Mass Index from height & weight
Mortgage Calculator
Calculate monthly payment with P&I, taxes, insurance
Calorie Calculator
Calculate daily calorie needs (TDEE)
Loan Calculator
Calculate monthly payments & interest
Age Calculator
Calculate exact age in years, months & days
Due Date Calculator
Calculate pregnancy due date