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APY Calculator

Investment

See the true return on a deposit by converting its advertised nominal rate into the effective Annual Percentage Yield (APY).

In short: The APY Calculator is a free online tool that lets you convert a nominal interest rate into its true annual percentage yield (APY) — instantly, with charts, a worked example and the exact formula.

Your inputs

% p.a.
130
₹1,00,000
₹1K₹10Cr

APY (effective yield)

8.24%

Nominal rate

8%

Annual earnings

₹8,243

On your deposit at APY

Nominal vs effective rate

How compounding lifts the nominal rate into a higher effective yield.

Rate breakdown

Rate breakdown
MetricValue (%)
Nominal rate8%
APY (effective)8.24%
Compounding boost0.24%

The compounding boost is the extra yield above the nominal rate.

How the APY Calculator works

Formula

APY = (1 + r/n)^n − 1
APY
Effective annual percentage yield
r
Nominal annual rate (decimal)
n
Compounding periods per year

Step-by-step calculation

Worked with the default values.

  1. 1

    Effective yield

    (1 + 8%/4)^4 − 1

    = 8.24%

  2. 2

    Annual earnings

    Deposit × APY

    = 8.24%

How it works

  • A nominal rate ignores compounding within the year; APY captures the interest earned on interest.
  • The more frequently interest compounds, the higher the APY for the same nominal rate.
  • APY lets you compare two deposits fairly even when their compounding schedules differ.

Examples

8% nominal compounded quarterly

Works out to about 8.24% APY — roughly 0.24% extra from compounding.

8% nominal compounded daily

Rises to about 8.33% APY, the highest for the same nominal rate.

Understanding the APY Calculator

What APY really tells you

The Annual Percentage Yield (APY) is the effective rate of return you earn on a deposit once compounding within the year is taken into account. A bank may advertise a nominal rate — say 8% per annum — but if that interest is added to your balance every quarter, you actually earn slightly more than 8% by year end, because each quarter's interest itself earns interest. APY captures that difference in a single, comparable number.

The formula is `APY = (1 + r/n)^n − 1`, where `r` is the nominal rate as a decimal and `n` is the number of times interest compounds per year.

Why compounding frequency matters

For the same nominal rate, the more often interest compounds, the higher the APY:

  • Annually (n = 1): APY equals the nominal rate.
  • Quarterly (n = 4): typical for Indian fixed deposits, a small lift.
  • Monthly (n = 12): common for some NBFC deposits, a larger lift.
  • Daily (n = 365): the highest effective yield for a given nominal rate.

The gap between nominal and effective widens as rates rise, so at higher interest levels the compounding boost becomes more valuable.

Comparing deposits fairly

Two banks might both look attractive — one offering 8% compounded quarterly, another 7.9% compounded daily. The only way to compare them honestly is to convert both to APY. This calculator does exactly that, and also shows the rupee earnings on a sample deposit so the difference feels concrete rather than abstract.

Things APY does not tell you

APY is a pre-tax figure. In India, deposit interest is added to your income and taxed at your slab rate, with TDS deducted once interest crosses the annual threshold. Your real, take-home yield is therefore lower than the APY shown. APY also assumes the rate and compounding schedule stay fixed for the full year, and it ignores penalties for premature withdrawal, minimum-balance requirements and any account fees.

Use APY as the starting point for comparison, then adjust for tax, liquidity and safety before deciding where to park your money.

Pros

  • Reveals the true, comparable return behind any advertised nominal rate.
  • Lets you compare deposits with different compounding frequencies on equal footing.
  • Simple, transparent formula with no market assumptions.
  • Helps spot marketing that quotes a flattering nominal rate but compounds infrequently.

Cons

  • APY is a pre-tax figure; post-tax yield is lower after slab-rate tax and TDS.
  • Assumes the rate and compounding frequency stay constant all year.
  • Ignores fees, penalties and minimum-balance rules that reduce real returns.

Tips

  • 1Always compare products on APY, not the headline nominal rate.
  • 2Confirm the exact compounding frequency your bank applies before comparing.
  • 3Remember to factor in tax to estimate your real, take-home yield.
  • 4For long horizons, even a small APY edge compounds into a meaningful difference.

Frequently asked questions

Everything you need to know about the APY Calculator.

What is the difference between nominal rate and APY?
The nominal rate is the stated annual rate before compounding. APY is the effective rate you actually earn once compounding within the year is counted, so APY is always equal to or higher than the nominal rate.
Why does more frequent compounding raise the APY?
Each time interest is added to the balance, the next period earns interest on a slightly larger amount. Compounding daily adds interest 365 times a year versus once for annual, so the effective yield is higher.
Is APY the same as APR?
No. APR (Annual Percentage Rate) usually describes borrowing cost and often excludes intra-year compounding, while APY describes the effective yield on savings including compounding. For the same nominal rate, APY is higher than a simple APR.
How is APY relevant to Indian deposits?
Banks in India usually quote a nominal FD or savings rate with quarterly compounding. Converting to APY shows the real annual yield, which helps you compare an FD against a debt fund or small savings scheme on equal terms.
Does a higher APY always mean a better deposit?
Not necessarily. Compare APY alongside safety, liquidity, penalties for early withdrawal, and tax treatment. A marginally higher APY on a riskier or less liquid product may not be worth it.
Is the interest shown here taxable?
Yes. In India, interest on deposits is added to your income and taxed at your slab rate, and banks deduct TDS above the annual threshold. The APY figure is a pre-tax yield.
What compounding frequency should I assume?
Use the frequency your bank states. Most Indian FDs compound quarterly, savings accounts often calculate daily and credit quarterly, and some NBFC deposits compound monthly.
Can APY be lower than the nominal rate?
No. With compounding at one or more times a year, APY is always greater than or equal to the nominal rate. They are equal only when interest compounds exactly once a year (annual compounding).
How do I convert APY back to a nominal rate?
Rearrange the formula: nominal = n × ((1 + APY)^(1/n) − 1). This tells you the stated rate a bank would need to advertise, given a compounding frequency, to deliver a target APY.

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