Compound Interest Calculator

Use our free compound interest calculator to see how your investment grows over time with compound interest. Adjust principal, rate, time, and compounding frequency to see the power of compounding.

Financial

Currency

Principal Amount

Annual Interest Rate (%)

Time Period (years)

years

Compounding Frequency

Formula

Compound interest is the eighth wonder of the world. This calculator shows how your principal grows exponentially when interest earns interest. Compare different compounding frequencies to maximize returns.

A = P(1 + r/n)^(nt)

Percentage: The percentage value you want to apply

Number: The original number or value

Result: The calculated result

How It Works

1Enter the principal amount you plan to invest.
2Set the annual interest rate and time period.
3Choose how often interest is compounded.
4The calculator applies the compound interest formula to show future value.

Examples

$10,000 at 7% for 10 years compounded monthly

1.r/n = 0.07/12 = 0.005833
2.nt = 12 × 10 = 120
3.A = $10,000(1.005833)^120 = $20,096.62

Result: $20,096.62

Frequently Asked Questions

Compound interest is interest earned on both the initial principal and the accumulated interest from previous periods, creating exponential growth.

More frequent compounding (daily) yields slightly higher returns than less frequent compounding (annual) at the same nominal rate.

The Rule of 72 estimates how long it takes to double your money: divide 72 by the annual interest rate (e.g., 72/7 ≈ 10.3 years at 7%).

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Compound Interest Explained

CalculateMe Team

Last updated: 2026-07-15

Frequently Asked Questions

Compound interest is interest earned on both the initial principal and the accumulated interest from previous periods, creating exponential growth.

More frequent compounding (daily) yields slightly higher returns than less frequent compounding (annual) at the same nominal rate.

The Rule of 72 estimates how long it takes to double your money: divide 72 by the annual interest rate (e.g., 72/7 ≈ 10.3 years at 7%).

Compound Interest Calculator

Formula

How It Works

Examples

$10,000 at 7% for 10 years compounded monthly

Frequently Asked Questions

What is compound interest?

What compounding frequency is best?

What is the Rule of 72?

Related Calculators

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Compound Interest Calculator

Formula

How It Works

Examples

$10,000 at 7% for 10 years compounded monthly

Frequently Asked Questions

What is compound interest?

What compounding frequency is best?

What is the Rule of 72?

Related Calculators

Related Articles