Compound Interest Calculator

Calculate compound interest growth and future portfolio value over time. Customize principal investment, annual interest rate (%), compounding frequency (daily, monthly, quarterly, annual), and optional monthly contributions.

Why Use This Tool?

• Investment & Wealth Growth: Project wealth accumulation in stock index funds, mutual funds, or high-yield savings accounts.
• Retirement Planning: Calculate how monthly contributions compound over 10, 20, or 30 years.
• Compounding Frequency Comparison: Compare monthly vs annual compounding interest growth.

How to Use

1. Enter Initial Principal (e.g. `$10,000`).
2. Enter Annual Interest Rate (%) (e.g. `8%`) and Term Years (e.g. `20 Years`).
3. Enter Monthly Contribution (e.g. `$500`) and select Compounding Frequency.

Real Working Example

Input:

Principal: $10,000 | Monthly Addition: $500 | Rate: 8% per year | Term: 20 Years | Compounded: Monthly

Output Result:

Total Future Value: $343,923.36 | Total Deposits: $130,000.00 | Total Compound Interest Earned: $213,923.36

Important Technical Details & Formulas

• Compound Interest Formula: `A = P(1 + r/n)^(nt) + PMT * [((1 + r/n)^(nt) - 1) / (r/n)]`.
• Year-by-Year Growth Table: Itemized yearly breakdown showing principal, contributions, interest earned, and ending balance.
• Local Memory Processing: Investment numbers stay 100% private in browser memory.

Related Mathematics & Financial Tools

• ROI Calculator: Compute return on investment.
• Loan EMI Calculator: Calculate monthly loan EMIs.
• Amortization Schedule Generator: Generate loan amortization tables.