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Compound Interest Calculator (Daily, Monthly, Annual)

Calculate compound interest growth with regular monthly deposits, flexible compounding frequencies, and detailed wealth schedules.

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How to Use the Compound Interest Calculator (Daily, Monthly, Annual)

1
Enter your initial starting balance.
2
Optionally specify a regular monthly addition.
3
Enter the quoted interest rate, compounding frequency, and duration in years to evaluate your investment growth.

Formula & Underlying Logic

The Compound Interest Equation

Standard compound interest without additional deposits follows the classical exponential formula:

A = P × (1 + r ÷ n)n × t

Where A is the final balance, P is the principal deposit, r is the annual interest rate, n is the compounding frequency per year, and t is time in years.

Worked Step-by-Step Example

Example Scenario: 100,000 at 10% for 5 Years with 5,000 Monthly Deposits

Total principal deposited: 400,000

Total interest earned: 178,000+

Ending balance: 578,000+

Frequently Asked Questions

The Rule of 72 is a mental math shortcut to estimate how many years it takes for an investment to double: divide 72 by your annual interest rate (e.g. 72 / 12% = 6 years to double).

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In-Depth Guides & Tutorials

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Power of Compound Interest with Worked Numbers

Power of Compound Interest with Worked Numbers

Understand the power of compound interest through concrete mathematical examples, daily vs monthly compounding rates, and the Rule of 72.

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