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Calculators

Compound Interest Calculator

Calculate investment growth, compound interest yields, and future balance with flexible compounding intervals.

Estimated Future Balance
$36,856.78

Effective Annual APY: 7.229%

Total Interest Earned
$14,856.78
Total Principal Invested
$22,000.00

Annual Growth Milestone Schedule

Year 1+$722.9 int.$11,922.9
Year 2+$861.91 int.$13,984.81
Year 3+$1,010.96 int.$16,195.77
Year 4+$1,170.79 int.$18,566.56
Year 5+$1,342.18 int.$21,108.74
Year 6+$1,525.95 int.$23,834.7
Year 7+$1,723.01 int.$26,757.71
Year 8+$1,934.32 int.$29,892.03
Year 9+$2,160.9 int.$33,252.92
Year 10+$2,403.86 int.$36,856.78
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How It Works & Underlying Concept

Compound interest is the addition of interest to the principal sum of a loan or deposit, or in other words, interest on interest. Over extended time horizons, exponential compounding enables modest regular investments to grow into substantial balances.

Mathematical Formula / RuleA = P(1 + r/n)^(nt) where P = Principal, r = Annual Interest Rate, n = Compounding Frequency, t = Time in Years
Quick Instructions
1Enter your starting principal balance.
2Enter the expected annual interest rate percentage.
3Specify the investment duration in years.
4Select your compounding frequency (e.g. Monthly or Annually).
5Inspect the future value, total interest earned, and annual schedule.

Key Capabilities

  • Supports Annually, Semi-Annually, Quarterly, Monthly, and Daily compounding
  • Optional ongoing annual contributions
  • Full year-by-year balance and interest breakdown schedule
  • Calculates the true Effective Annual Rate (EAR / APY)
Real-World Example

Long-term Index Fund Investment

An investor deposits $10,000 into a diversified index fund yielding an average 8% annual return compounded monthly over 15 years.

Step 1:Principal: $10,000; Rate: 8%; Tenure: 15 years; Frequency: Monthly (n = 12).
Step 2:Monthly rate: 0.08 / 12 = 0.006667. Total periods: 15 × 12 = 180.
Step 3:Future value formula yields: $10,000 × (1 + 0.006667)^180 = $33,069.21.
Result: The $10,000 investment grows to $33,069.21, generating $23,069.21 in interest.
Technical Notes & Limits
  • Assumes a constant fixed return rate throughout the entire investment duration.
  • Does not adjust for inflation or capital gains taxation.

Frequently Asked Questions

What is the difference between simple and compound interest?▾
Simple interest is paid only on the initial principal. Compound interest earns returns on both the principal and all previously accumulated interest.
How does compounding frequency affect my returns?▾
The more frequently interest is compounded (e.g. daily vs. annually), the faster your money grows, because interest starts earning interest sooner.

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