What is Compound Interest Calculator?
Calculate how your investments grow under compound interest. Uses the formula A = P(1 + r/n)^(nt). Set initial principal, regular contributions, annual interest rate, compounding frequency, and investment period. Generates a detailed year-by-year growth table and total interest earned. Perfect for savings planning, fund investment calculations, retirement savings projections, and loan interest analysis.
Use Cases
- ◆Savings account compound growth calculation
- ◆Fund investment return estimation
- ◆Retirement savings planning
- ◆Loan compound interest calculation
- ◆Investment plan comparison
How to Use
- 1Enter the initial principal amount
- 2Set annual interest rate and compounding frequency
- 3Enter investment period and regular contributions
- 4View compound growth results and detailed table
Features
- ✓Free
- ✓Compound interest formula
- ✓Multiple compounding frequencies
- ✓Regular contributions
- ✓Detailed growth table
- ✓Real-time calculation
- ✓No signup
- ✓Works everywhere
FAQ
What is the difference between compound and simple interest?
Simple interest charges only on principal (I = P*r*t); compound interest charges on principal plus accumulated interest (A = P(1+r/n)^(nt)). Compound interest produces exponential growth over long periods.
How much does compounding frequency matter?
Significantly. At 5% annual rate for 30 years: annual compounding gives 4.32x, monthly gives 4.46x, daily gives 4.48x.
How do I calculate monthly contributions with compound interest?
Use the future value of annuity formula: FV = PMT * [(1+r/n)^(nt) - 1] / (r/n). The tool has this built in.
Are the results accurate?
Uses the standard compound interest formula with results precise to the cent. Actual returns are affected by market volatility, fees, and taxes.
Is this tool free?
Yes, completely free. No accounts, no paywalls.
Can it calculate loan compound interest?
Yes. Enter the loan amount as principal and the loan rate as annual rate. Note that loans typically use amortized repayment.