Compound interest calculator

Compound interest calculator

See your future growth—based on your current investments, monthly contributions and time horizon.

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Investment Inputs

Contributions compound at the selected frequency

Rate of return is annual (0-30%)

Final Values

Final Balance

$107,144

Total Contributions

$70,000

Total Interest

$37,144

Growth Over Time

Starting Amount
Contributions
Interest
Year 1
Year 2
Year 3
Year 4
Year 5
Year 6
Year 7
Year 8
Year 9
Year 10

How compound interest works

Compound Interest Grows Your Wealth by earning returns on your returns. It's like a snowball rolling downhill—starting small but picking up size and speed as it goes. Given enough time, even modest savings can grow into something substantial.


Time Is Your Best Friend when it comes to building wealth. Start investing five years earlier, and you could end up with significantly more money. Compound interest doesn't care about perfect timing; it cares about time itself.


Small Amounts Add Up faster than you'd think. Adding even $100 or $200 monthly to your investments makes a huge difference over the years. You don't need to be wealthy to build wealth—you just need to start and be consistent.


The Right Strategy Depends on Your Goals and where you are in life. Whether you're saving for retirement, a child's education, or building generational wealth, compound interest works differently for each timeline. Understanding your specific situation helps you make the most of compounding's power.

Factors that impact your growth

Your Interest Rate Matters more than you might think. Even a 2% difference in annual returns can mean tens of thousands more in your account decades later. This is why finding the right investment mix matters—balancing risk and reward for your unique situation.


Contribution Frequency accelerates your growth potential. Contributing monthly instead of yearly means your money starts compounding sooner. Many people find automatic monthly transfers as the easiest way to stay consistent and maximize their compound growth.


Tax Treatment can significantly affect your final balance. Tax-advantaged accounts like IRAs and 401(k)s let your money compound without the drag of annual taxes (or, any taxes depending on your withdrawal timeline). Understanding these options helps you keep more of what your investments earn, for more insight on what's right for you, read our guide "Finding Your Fit: Roth IRAs vs Traditional IRAs".


Investment Fees quietly eat away at compound growth. A 1% annual fee might not sound like much, but over decades it can reduce your final balance substantially. Knowing what you're paying—and why—helps ensure more of your returns stay in your pocket.

Disclaimer
Datalign Advisory calculators offer estimates based on your inputs and generally accepted financial principles. Results are for illustrative purposes only and may differ from actual outcomes. These tools are intended for educational use and are not a substitute for professional financial advice.

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Cambridge, MA, USA

@ 2025 Datalign Advisory. All rights reserved.

Datalign Advisory, Inc. (“Datalign Advisory”) is a solicitor for the third-party advisors on our platform. These advisors pay Datalign Advisory a referral fee for prospective client introductions. This referral fee varies based on the information you supply in the Questionnaire and the desired client profile of the Matched Advisor. In return, we provide the Matched Advisor with the information you provide us through our Questionnaire, including phone number and e-mail address. This fee is paid solely by the Matched Advisor and is paid to Datalign Advisory regardless of whether or not you become a client of the Matched Advisor. There are no fees to you for the use of our platform. Datalign Advisory is not otherwise affiliated with the Matched Advisor and does not provide investment advice on its behalf.Participating Advisers pay us a fee for each Investor introduction. Participating Advisers may pay different levels of fees based on a combination of demand and profile of the Investors matched and introduced. This creates a conflict of interest because we could generate more revenue by introducing Investors to the Participating Adviser willing to spend the most, rather than the adviser that best suits an Investor’s needs. We mitigate this risk by only introducing Investors to Participating Advisers that are deemed suitable and match based on information Investors self-report through our platform. Where multiple Participating Advisers meet the requirements identified by an Investor and are deemed equally suitable, the introduction will be made to the Participating Adviser that is willing to pay us the highest referral fee, as determined through an auction.

Datalign Advisory, Inc. (“Datalign Advisory”) is registered with the U.S. Securities and Exchange Commission as a Registered Investment Advisor. Datalign Advisory provides referrals to third-party investment advisors based on consumers’ financial information, services required, and preferred relationship with an investment advisor, as reported through our Questionnaire. Datalign Advisory does not manage client assets nor provide investment recommendations. Datalign Advisory’s form ADV Part 2A is available here, and the Form CRS here.

Cambridge, MA, USA

@ 2025 Datalign Advisory. All rights reserved.

Datalign Advisory, Inc. (“Datalign Advisory”) is a solicitor for the third-party advisors on our platform. These advisors pay Datalign Advisory a referral fee for prospective client introductions. This referral fee varies based on the information you supply in the Questionnaire and the desired client profile of the Matched Advisor. In return, we provide the Matched Advisor with the information you provide us through our Questionnaire, including phone number and e-mail address. This fee is paid solely by the Matched Advisor and is paid to Datalign Advisory regardless of whether or not you become a client of the Matched Advisor. There are no fees to you for the use of our platform. Datalign Advisory is not otherwise affiliated with the Matched Advisor and does not provide investment advice on its behalf.Participating Advisers pay us a fee for each Investor introduction. Participating Advisers may pay different levels of fees based on a combination of demand and profile of the Investors matched and introduced. This creates a conflict of interest because we could generate more revenue by introducing Investors to the Participating Adviser willing to spend the most, rather than the adviser that best suits an Investor’s needs. We mitigate this risk by only introducing Investors to Participating Advisers that are deemed suitable and match based on information Investors self-report through our platform. Where multiple Participating Advisers meet the requirements identified by an Investor and are deemed equally suitable, the introduction will be made to the Participating Adviser that is willing to pay us the highest referral fee, as determined through an auction.

Datalign Advisory, Inc. (“Datalign Advisory”) is registered with the U.S. Securities and Exchange Commission as a Registered Investment Advisor. Datalign Advisory provides referrals to third-party investment advisors based on consumers’ financial information, services required, and preferred relationship with an investment advisor, as reported through our Questionnaire. Datalign Advisory does not manage client assets nor provide investment recommendations. Datalign Advisory’s form ADV Part 2A is available here, and the Form CRS here.

Cambridge, MA, USA

@ 2025 Datalign Advisory. All rights reserved.

Datalign Advisory, Inc. (“Datalign Advisory”) is a solicitor for the third-party advisors on our platform. These advisors pay Datalign Advisory a referral fee for prospective client introductions. This referral fee varies based on the information you supply in the Questionnaire and the desired client profile of the Matched Advisor. In return, we provide the Matched Advisor with the information you provide us through our Questionnaire, including phone number and e-mail address. This fee is paid solely by the Matched Advisor and is paid to Datalign Advisory regardless of whether or not you become a client of the Matched Advisor. There are no fees to you for the use of our platform. Datalign Advisory is not otherwise affiliated with the Matched Advisor and does not provide investment advice on its behalf.Participating Advisers pay us a fee for each Investor introduction. Participating Advisers may pay different levels of fees based on a combination of demand and profile of the Investors matched and introduced. This creates a conflict of interest because we could generate more revenue by introducing Investors to the Participating Adviser willing to spend the most, rather than the adviser that best suits an Investor’s needs. We mitigate this risk by only introducing Investors to Participating Advisers that are deemed suitable and match based on information Investors self-report through our platform. Where multiple Participating Advisers meet the requirements identified by an Investor and are deemed equally suitable, the introduction will be made to the Participating Adviser that is willing to pay us the highest referral fee, as determined through an auction.

Datalign Advisory, Inc. (“Datalign Advisory”) is registered with the U.S. Securities and Exchange Commission as a Registered Investment Advisor. Datalign Advisory provides referrals to third-party investment advisors based on consumers’ financial information, services required, and preferred relationship with an investment advisor, as reported through our Questionnaire. Datalign Advisory does not manage client assets nor provide investment recommendations. Datalign Advisory’s form ADV Part 2A is available here, and the Form CRS here.