Compound interest means earning interest on both your original investment and the interest it has already earned, so your money grows faster over time. For example, $1,000 at 7% annual interest becomes about $1,967 in 10 years. Enter your investment details below to see exactly how much your money can grow.
Our Compound Interest Calculator helps you visualize how your money can grow over time based on your initial investment, interest rate, regular contributions, and compounding frequency.
What the Calculator Does
This tool allows you to:
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Enter your initial investment amount
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Set an annual interest rate
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Choose a time period (in years)
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Add regular contributions (monthly, weekly, etc.)
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Select how often the interest is compounded and how frequently you contribute
Based on these inputs, the calculator will show you:
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Future value of your investment
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Total interest earned
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Total contributions made
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Total return as a percentage
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A year-by-year breakdown
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A visual chart of your projected growth
How It Works
Compound interest means earning interest on both your original principal and any accumulated interest. When you add regular contributions into the mix, your growth accelerates even more.
The formula used accounts for both the compounding of the initial investment and any additional contributions. It adjusts for differences in compounding and contribution frequencies to give you an accurate projection.
Why This Matters
Understanding how compound interest works puts you in control. Small changes—like increasing your contribution or adjusting the frequency—can significantly improve your long-term results.
This calculator helps you make informed decisions about saving, investing, and planning for the future.
Compound Interest Calculator
Calculate how your money can grow with compound interest
Compound Interest Formula
Compound interest is calculated using this formula:
A = P(1 + r/n)nt
- A – Future value (total amount)
- P – Principal (initial investment)
- r – Annual interest rate (as decimal)
- n – Compounding periods per year
- t – Time in years
Worked Examples
Example 1 – Lump sum growth
Invest $10,000 at 7% compounded annually for 20 years. A = 10,000(1 + 0.07/1)1×20 = 10,000(1.07)20 = $38,696.84. Interest earned: $28,696.84.
Example 2 – Monthly compounding
Invest $5,000 at 6% compounded monthly for 10 years. A = 5,000(1 + 0.06/12)12×10 = 5,000(1.005)120 = $9,096.98.
Frequently Asked Questions
What is the difference between simple and compound interest?
Simple interest is calculated only on the principal. Compound interest is calculated on principal plus accumulated interest, so your money grows exponentially over time.
How often should interest compound?
More frequent compounding (daily vs. annually) yields slightly higher returns. The difference is small but compounds over long periods.
What is the Rule of 72?
Divide 72 by your interest rate to estimate years to double your money. At 7%, money doubles in about 10.3 years (72/7).
About the author: The DaProfitClub finance tools team builds free, accurate calculators reviewed against standard financial formulas.
Sources: Standard compound interest mathematics; investor.gov guides. Last reviewed: September 2026.
Disclaimer: This calculator is for educational purposes only and does not constitute financial advice. Investment returns are not guaranteed.