Compound Interest Calculator
Compound Interest Calculator
Use this free Compound Interest Calculator to calculate the future value of your investments with yearly breakdown, growth charts, and CSV export. It’s perfect for financial planning, savings goals, or investment analysis. Simply enter your starting amount, interest rate, duration, and contribution details to get started.
What is Compound Interest?
Compound interest is the process of earning interest on both the original principal and on the interest already added. It is a powerful mechanism that accelerates investment growth over time. The more frequently interest is compounded and the longer your money stays invested, the greater your returns.
Compound Interest Formula
The standard compound interest formula is:
A = P × (1 + r/n)nt- A = Final amount
- P = Principal investment amount
- r = Annual nominal interest rate (as a decimal)
- n = Number of times interest is compounded per year
- t = Number of years
If you contribute regularly (e.g., monthly), the formula becomes:
A = P × (1 + r/n)<sup>nt</sup> + PMT × [((1 + r/n)<sup>nt</sup> - 1) / (r/n)]
- PMT = Regular contribution amount per period
Why Use This Calculator?
- Visualize your savings growth with interactive charts
- See detailed yearly breakdown of interest earned
- Export your results to CSV for Excel or Google Sheets
- Supports multiple currencies with auto-detection
- Mobile-friendly and accessible design
How to Use the Calculator
- Choose your currency (auto-selected based on your location)
- Enter your principal amount (starting value)
- Enter annual interest rate and investment duration
- Optionally add monthly or yearly contributions
- Click “Calculate” to view results, chart, and table
- Download the breakdown as CSV if needed
Frequently Asked Questions
What’s the difference between simple and compound interest?
Simple interest only earns interest on the original principal, while compound interest earns interest on both the principal and accumulated interest over time. Compound interest grows faster.
Can I use this for retirement planning?
Yes! You can model your SIPs (Systematic Investment Plans), long-term savings, or other recurring investments with this calculator by entering a monthly or yearly contribution.
Is my data saved?
No. All calculations are performed locally in your browser. Nothing is stored or sent to a server.
Optimize Your Financial Growth
This calculator is ideal for individuals, students, investors, or professionals looking to understand the power of compounding. Bookmark this tool or share it with your friends to help them grow their financial literacy.