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Compound Interest Calculator – Future Value with Compounding

Compound interest is the process of earning interest on both the original principal and previously accumulated interest — creating exponential rather than linear growth. It's the fundamental mechanism behind all long-term wealth building, and understanding exactly how it behaves helps you make better saving and investing decisions.

This calculator projects the future value of any starting amount at any interest rate, compounding frequency, and time horizon. Add regular monthly contributions to model savings accounts and investment portfolios. A year-by-year table shows exactly how growth accelerates over time.

How to use the Compound Interest Calculator

Enter the principal (starting amount).

Enter the annual interest rate.

Select compounding frequency: daily, monthly, quarterly, or annually.

Enter the number of years.

Optionally add regular monthly contributions.

View future value, total contributions, and total interest earned.

Future Value of $10,000 at Different Rates and Compounding
Rate & Frequency	10 Years	20 Years	30 Years
5% (annually)	$16,289	$26,533	$43,219
5% (monthly)	$16,470	$27,126	$44,677
7% (annually)	$19,672	$38,697	$76,123
7% (monthly)	$20,097	$40,075	$81,165
10% (monthly)	$27,070	$73,281	$198,374

Compound Interest Calculator FAQ

What is the Rule of 72?

Divide 72 by the annual interest rate to estimate doubling time. At 6%: 72÷6 = 12 years. At 9%: 72÷9 = 8 years. Quick mental math for gauging how long it takes compound growth to double your money.

How much does compounding frequency matter?

More compounding periods mean slightly higher effective yield. At 6% for 20 years on $10,000: annually = $32,071; monthly = $33,102; daily = $33,198. The rate itself matters far more than frequency.

How does compound interest apply to debt?

Credit cards typically compound daily. At 24% APR daily compounding, a $5,000 balance you never pay grows to nearly $7,500 in 3 years. The same mathematics that builds wealth for investors destroys wealth for borrowers carrying high-rate balances.

What is APY vs APR?

APR is the stated annual rate. APY (Annual Percentage Yield) reflects the actual return after compounding: APY = (1 + APR/n)ⁿ − 1. Banks must disclose APY on savings accounts. A 6% APR compounded monthly has an APY of 6.17%.