Compound Interest Calculator

Calculate how your money can grow with compound interest. Choose a simple calculation mode for quick results, or open Advanced Options to include regular contributions, inflation, taxes and fees.

Investment Calculator

Choose what you want to calculate. Most users only need the default "Future Value" option.

Initial Investment (Principal)

Currency

Target Future Value

Annual Interest Rate (%)

Investment Period (Years)

Compounding Frequency

Regular Contributions

Contribution Amount

Contribution Frequency

Contribution Timing

End of Period

Beginning of Period

Inflation

Expected Annual Inflation (%)

Taxes & Fees

Tax on Interest (%)

Annual Fee (% of Total Value)

Contribution Growth

Annual Contribution Increase (%)

Show Year-by-Year Growth

Estimated Future Value $19,671.51

Initial Investment $10,000.00

Total Contributions $0.00

Interest Earned $9,671.51

Effective Annual Rate 7.23%

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

Why Use Our Compound Interest Calculator?

Compound interest allows your investment to potentially earn returns on previously accumulated interest. Over longer periods, this can create substantial growth. ToolNish makes it easy to compare different interest rates, compounding frequencies, contribution amounts and investment periods without manually performing complex calculations.

What Can This Calculator Calculate?

Future value of an investment
Total compound interest earned
Required initial investment
Required annual interest rate
Required investment period
Required recurring contribution
Effective annual rate / APY
Investment growth with regular deposits
Beginning or end-of-period contributions
Inflation-adjusted future value
Estimated after-tax interest
Estimated impact of annual fees
Increasing contributions over time
Year-by-year investment growth

How Compound Interest Works

Compound interest is calculated on the original principal plus interest that has already accumulated. The more frequently interest is compounded, the more opportunities there are for accumulated interest to earn additional returns.

Compound Interest Formula

For standard periodic compounding, the basic formula is:

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

A = Future value
P = Initial principal
r = Annual interest rate in decimal form
n = Compounding periods per year
t = Number of years

Compound Interest vs Simple Interest

Simple interest calculates returns only on the original principal. Compound interest allows accumulated interest to participate in future growth. This difference can become increasingly significant as the investment period becomes longer.

Understanding APY

APY, or Annual Percentage Yield, represents the effective annual return after taking the effect of compounding into account. For example, an investment with a stated annual rate of 7% compounded monthly has an effective annual rate slightly higher than 7%.

Inflation-Adjusted Investment Value

The future value of an investment does not necessarily represent its future purchasing power. Inflation can reduce what that future amount is worth in today's money. The Advanced Options section lets you enter an expected inflation rate to estimate the inflation-adjusted value of your future balance.

Regular Contributions and Compound Growth

Regular contributions can significantly increase long-term investment growth. The calculator allows you to add contributions weekly, bi-weekly, monthly, quarterly, semi-annually or annually. You can also choose whether each contribution is made at the beginning or end of its contribution period.

Frequently Asked Questions

Compound interest is interest calculated on the original principal and on interest accumulated during previous periods.

Yes. Enter your regular contribution amount and select Monthly as the contribution frequency. You can also select a different contribution frequency from the available options.

Compounding frequency determines how often interest is added to the balance. Contribution frequency determines how often you add your own money to the investment. They can be different.

When the stated nominal annual interest rate is the same, more frequent compounding generally produces a higher effective annual return. Actual financial products can use different rate structures and terms.

APY stands for Annual Percentage Yield. It represents the effective annual return after accounting for compounding.

Yes. Open Advanced Options and enter an expected annual inflation rate to estimate the future value in today's purchasing power.

Yes. Advanced Options include optional tax-on-interest and annual-fee assumptions.

No. The calculator provides a mathematical estimate based on the assumptions you enter. Actual investment returns can change and may include losses, taxes, fees and other factors.

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