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Compound Interest Calculator 2026

Compound interest is interest earned on both the original principal and interest already added. Future value follows A = P(1 + r/n)^(nt) for the compounding frequency selected on this page.

⚠️ Disclaimer: This calculator provides theoretical projections based on assumed constant interest rates. Actual returns depend on market conditions, fees, and tax implications. For assumption & planning purposes only.
$
%
years

Total Future Value

$0.00
Total Interest-$10,000.00
Principal$10,000.00

Compound interest is interest calculated on the initial principal, which also includes all of the accumulated interest from previous periods on a deposit or loan.

Year-by-Year Growth Schedule

YearStarting PrincipalInterest EarnedEnding Balance
Year 1$10,000.00+$511.62$10,511.62
Year 2$10,511.62+$537.79$11,049.41
Year 3$11,049.41+$565.31$11,614.72
Year 4$11,614.72+$594.23$12,208.95
Year 5$12,208.95+$624.63$12,833.59
Year 6$12,833.59+$656.59$13,490.18
Year 7$13,490.18+$690.18$14,180.36
Year 8$14,180.36+$725.49$14,905.85
Year 9$14,905.85+$762.61$15,668.47
Year 10$15,668.47+$801.63$16,470.09

Financial & Tax Advice Disclaimer

This tool is provided strictly for educational, planning, and illustrative purposes. All figures, estimates, compounding formulas, and tax calculations are based on user input parameters and current mathematical models.

No Performance Guarantee & Liability: Output calculations do not guarantee future returns, exact bank interest payouts, market gains, or legal tax liability. Toolioz and its maintainers accept no legal or financial liability for investment losses, loan commitments, or tax penalties resulting from the use of this calculator.

Always consult a certified financial planner, registered investment advisor, or Chartered Accountant (CA) before taking financial action.

What the annual example leaves out

Annual compounding only

  • $10,000 at 10%: With frequency set to yearly, 20 years grows to about $67,275, or 6.73 times the principal.
  • $10,000 at 7%: The same yearly setting for 20 years grows to about $38,697, or 3.87 times the principal.
  • No tax field: The page does not reduce the rate for income tax, capital gains, or a mutual-fund exit.

Not a product comparison

  • One principal: The formula does not add deposits or withdrawals.
  • Frequencies: The selector is yearly, quarterly, monthly, or daily. The default is monthly.
  • Currency: Results are formatted in USD. The page does not rank PPF, FDs, or equity funds.

What the formula does

One principal, one annual rate, and a compounding frequency of 1, 4, 12, or 365.

Worked figures

  • •Default: ₹10,000 at 5% for 10 years, compounded monthly, finishes near ₹16,470. Interest is about ₹6,470.
  • •Daily: The same principal, rate, and term compounded daily finishes near ₹16,487.
  • •Rule of 72: 72 divided by the annual percent is a rough doubling time. At 12% that estimate is 6 years. The calculator does not print it.
  • •EAR: A 12% nominal rate compounded monthly is about 12.68% effective per year: (1 + 0.12 / 12)^12 − 1.

Not in this calculator

  • •No deposits: Monthly contributions and step-ups are not inputs. Those belong on the SIP calculator.
  • •No withdrawals: The balance is never reduced during the term.
  • •No inflation: A nominal result is not converted to purchasing power.
  • •No tax: The future value is before tax and fees.

Frequency options

  • ✅Annual: n = 1.
  • ✅Quarterly: n = 4.
  • ✅Monthly: n = 12. This is the starting selection.
  • ✅Daily: n = 365. The same 5% and 10-year example is about ₹17 higher than monthly.
  • ✅Interest line: Future value minus the principal typed in.

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Frequently Asked Questions

The compound interest formula is A = P(1 + r/n)^(nt), where A is the future value, P is principal, r is annual rate, n is compounding frequency per year, and t is time in years.

Higher compounding frequency (e.g. daily vs annual) leads to higher Effective Annual Rate (EAR) and greater overall returns, because interest is added back to principal more frequently.

Divide 72 by the annual rate in percent for a rough doubling time. At 12% that estimate is 6 years. It is not the result this calculator prints.

Publisher notes · reviewed 10 September 2026

Compound interest: frequency is part of the answer

Compound interest adds earned interest back to principal on a schedule. Two quotes with the same nominal annual rate are not equal if one compounds monthly and the other annually. This page makes that difference visible.

The equation and a numeric check

A = P (1 + r/n)^(n t). P is opening principal, r is the nominal annual rate as a decimal, n is compounds per year, t is years. ₹1,00,000 at 8% for 5 years compounded annually is 100000 × (1.08)^5 ≈ ₹1,46,933. Compounded monthly, n = 12, the same inputs finish near ₹1,48,984. The extra ₹2,051 is frequency, not a second product.

A one-time mutual-fund lumpsum and a bank FD use this same family of math. An FD that compounds quarterly is n = 4. Toolioz does not keep a second public page for those keywords: type the deposit rate and tenure here. Monthly additions still belong on the SIP calculator.

Compound interest is not SIP math

This page compounds one principal. Monthly additions belong on the SIP calculator. Mixing the two formulas is a common error in informal "how much will I have" threads.

Worked examples

  • Rule of 72 as a sanity check

    At 8% annual compounding, 72 / 8 ≈ 9 years to double. The exact doubling time is ln(2)/ln(1.08) ≈ 9.01 years. If the tool shows a double in 6 years at 8%, the inputs are wrong.

Limits of this page

  • Inflation is not subtracted; real purchasing power is lower than A.
  • Fees, TDS, and premature-withdrawal penalties are issuer-specific.

Sources