Compound Interest Calculator

Calculate compound interest with regular contributions. See how your investments grow over time with customizable compounding frequency.

Initial Investment

Principal Amount

Annual Interest Rate (%)

Time Period (Years)

Compounding Frequency

Regular Contributions

Contribution Amount

Contribution Frequency

Contribution Timing

End of period = ordinary annuity. Beginning = annuity due (one extra compounding period).

Inflation & Tax

Inflation Rate (%)

Tax Rate on Gains (%)

Tax-Deferred Account (IRA/401k)

If checked, taxes applied only at withdrawal (not annually)

Quick Scenarios

Total Invested

$0.00

Final Balance

$0.00

Total Interest

$0.00

Effective APY

Inflation-Adjusted

$0.00

After-Tax Value

$0.00

Growth Over Time

Yearly Breakdown

Year	Start Balance	Contributions	Interest Earned	End Balance	Inflation-Adj.

Milestones

Disclaimer: These calculators provide approximate estimates for educational and planning purposes only. They do not constitute financial, tax, or investment advice. Rates, tax brackets, allowances, and assumptions vary by jurisdiction and change over time. Always verify figures with a qualified professional or official source before making any financial decision.