Compound Interest Calculator

See how your money grows over time with compound interest and monthly contributions.

Investment Details

Starting Investment Initial amount (₹ / $ / any currency)

Annual Interest Rate (%) Expected yearly return

Compounding Frequency

Time Period (Years)

Monthly Contribution Additional monthly deposit

Results

          Final Balance
          —
          After all growth
        

Total Interest Earned —

Total Invested — Principal + contributions

Investment Period — years of growth

Principal & Contributions Interest Earned

Principal (Invested)

Interest Earned

Year-by-Year Growth

Enter your investment details above to see the year-by-year breakdown.

Rate Comparison

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Lower Rate

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Your Rate

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—%

Higher Rate

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Frequently Asked Questions

What is compound interest?

Compound interest is interest earned on both the initial principal and all previously accumulated interest. It grows your money faster than simple interest.

How often is interest compounded?

Common frequencies: monthly (12x/yr), quarterly (4x/yr), annually (1x/yr). More frequent compounding means slightly higher returns.

What is the Rule of 72?

Divide 72 by the annual interest rate to estimate how many years it takes to double your money. Example: 72 ÷ 8% = 9 years to double.

Is compound interest always better than simple interest?

Yes, for investments. For loans, compound interest means you pay more — so try to pay off compound loans early.

✅ Do's and ❌ Don'ts

✅ Do's

✅ Do start investing early — compound interest rewards time the most.
✅ Do reinvest dividends and interest instead of withdrawing them.
✅ Do compare different compounding frequencies before choosing an investment.
✅ Do factor in inflation to understand real returns.

❌ Don'ts

❌ Don't forget that compound interest also applies to debt — pay credit cards in full.
❌ Don't assume high interest rates are guaranteed — returns vary.
❌ Don't ignore fees — they can significantly reduce compound growth over time.
❌ Don't wait for the "perfect time" — start small and increase contributions over time.

📐 How Compound Interest Works

Formula: A = P × (1 + r/n)^nt

A = Final amount
P = Principal (initial investment)
r = Annual interest rate (decimal)
n = Compounding frequency per year
t = Time in years

Worked Example

₹1,00,000 at 10% annually compounded monthly for 10 years:

A = 1,00,000 × (1 + 0.10/12)¹²⁰ = ₹2,70,704

Total interest earned: ₹1,70,704 — that's 170% growth on your original investment!

Also try: SIP Calculator · FD Calculator · ROI Calculator

Frequently Asked Questions

Is this tool free to use?

Yes. All UpTools calculators are completely free, with no sign-ups required.

Is my data private?

Yes. All calculations run locally in your browser. Nothing is uploaded to any server.

Does it work on mobile?

Yes. All tools are mobile-responsive and work on any device — phone, tablet, or desktop.

Can I use this offline?

Most tools work offline after the initial page load. No internet needed for calculations.

📐 How This Tool Works

This tool computes results entirely in your browser using JavaScript. No data is sent to any server, ensuring your privacy.

Results update instantly as you type — no waiting for server responses.

Also try: Calculator · Converter · Generator