Compound Interest Calculator

Calculate how your investments grow over time with compound interest and optional monthly deposits.

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You're just a step away from using compound interest calculator. Fill out the quick setup form below to get started. Whether you're here to explore, create, manage, or solve — this experience is built to work seamlessly for you.

Compound Interest Calculator
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Additional deposits/loans

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Totals

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Explore Compound Interest Calculator

About Compound Interest Calculator

The Compound Interest Calculator is a powerful tool for projecting how your money can grow over time through the power of compounding. It calculates the future value of an initial investment or loan, with optional monthly deposits or withdrawals, interest rate, and compounding frequency. This tool helps savers, investors, and even borrowers understand the long-term effect of interest accumulation on financial goals or obligations.

Practical Use Cases:

  • Long-term savers can visualise how consistent deposits add up to large returns over decades.
  • Investors can simulate how various interest rates and timeframes impact their investment value.
  • Parents saving for children’s education can project school fund growth with small monthly contributions.
  • Employees planning retirement can track pension or 401(k)-style investment growth with compound interest.
  • Loan recipients or borrowers can assess the effect of compound interest when planning repayments or evaluating borrowing cost.
  • Financial advisors and coaches can illustrate various savings scenarios to clients during consultations.

This calculator provides both the total compound interest earned and the breakdown between interest on the initial amount and interest on the recurring deposits. It’s perfect for comparing “do-nothing” saving strategies versus “active contribution” ones.

How Compound Interest Calculator Works

Input Fields:

  • Initial Amount ($) – The lump sum or principal you start with.
  • Interest Rate (%) – Annual interest applied to the account or loan.
  • Term (Years + Months) – Total period over which the interest is compounded.
  • Compound Frequency – Choose from monthly, quarterly, annually, etc.
  • Monthly Deposit/Loan Amount ($) – Optional recurring contribution or deduction.
  • Deposit Timing – Choose whether deposits happen at the beginning or end of each period.

Calculations:

Uses compound interest formulas to calculate:

  • Interest on the initial principal
  • Interest earned from additional deposits
  • Total compound interest
  • Final account balance

Results Displayed:

  • Principal
  • Total Deposits
  • Interest on Principal
  • Interest on Deposits
  • Total Interest
  • Final Balance

FAQs for Compound Interest Calculator

What is compound interest?

Compound interest is interest calculated on both the principal and accumulated interest, allowing your money to grow faster over time.

How does deposit timing affect results?

Depositing at the beginning of each period earns more interest than depositing at the end.

Is this calculator only for savings?

No, it can also model how loans grow if you're borrowing money with compounding interest.

Does it support daily compounding?

If available in settings, yes — otherwise common intervals like monthly or annually are supported.

Can I adjust the deposit amount later?

This tool assumes a fixed recurring deposit for simplicity. For varied inputs, consider an advanced projection tool.

Is this useful for retirement planning?

Absolutely. It helps estimate the future value of consistent investments with compound growth.

Report an Issue with Compound Interest Calculator

If you encounter any issues or have suggestions for improvements, please report them using the form below.

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