FD Calculator: Fixed Deposit Maturity & Interest

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Quick answer

Enter a deposit, an annual interest rate and a tenure in years, and it returns the maturity amount and the interest earned for a fixed deposit. It compounds quarterly using A = P(1 + r/4) to the power (4 × years), which is how most Indian banks work out FD maturity. ₹1,00,000 at 7% for 5 years matures to about ₹1,41,478. The sum is worked out in your browser as you type.

What the FD Calculator does

Put in a deposit amount, an annual interest rate and a tenure in years, and the tool shows the maturity amount and the interest you'd earn. It works in rupees and recalculates as you type.

A fixed deposit locks a lump sum for a set term at a fixed rate. This projects a cumulative FD, where the interest is reinvested each quarter. That reinvestment is why the effective yield comes out a little above the headline rate.

How it works

It applies compound interest four times a year: A = P × (1 + r/4) raised to the power of 4 times the years. The quarterly rate is the annual rate divided by four.

The maturity is A and the interest earned is A minus the deposit. The frequency is fixed at quarterly because that's what most Indian banks use to work out FD maturity.

Methodology

Step 1. Take the deposit P, the annual rate r (as a percentage) and the tenure y in years.
Step 2. Compound quarterly: A = P × (1 + r/100/4) to the power of (4 × y).
Step 3. Report the maturity amount A and the interest, which is A − P.
Step 4. Recompute whenever an input changes.

FD maturity (quarterly compounding)

A = P × (1 + r/4)^(4 × y)
P = deposit, r = annual rate (decimal), y = years
quarterly rate = r/4, periods = 4y; Interest = A − P

Worked examples
₹1,00,000 at 7% for 5 years, compounded quarterly: A ≈ ₹1,41,478 (interest ≈ ₹41,478)
Four compounding periods a year push the effective rate slightly above the 7% nominal

Indian banks typically compound FD interest quarterly, so the tool fixes the frequency at four instead of letting you change it. It models a cumulative FD. A payout (non-cumulative) FD pays the interest out each quarter and does not grow this way.

Assumptions

Quarterly compounding (four periods a year). This is the standard Indian bank convention, though some products differ.
One fixed rate for the whole tenure, and a cumulative FD where interest is reinvested instead of paid out.
No tax deducted. FD interest is taxable and banks apply TDS, so the figure is gross.
You hold the deposit to maturity. Breaking it early usually carries a rate penalty.

Technical details

Inputs	Deposit, annual rate %, years
Compounding	Quarterly (fixed, n = 4)
Outputs	Maturity amount, interest earned
Type modelled	Cumulative FD
Currency	Rupees (₹)
Formula	A = P(1 + r/4)^(4y)
Where it runs	In your browser, updating as you type

Standards and references

A = P(1 + r/4)^(4y): compound interest at a quarterly frequency, the formula behind a cumulative fixed deposit's maturity.
Indian bank convention: most banks compound FD interest quarterly to arrive at the maturity value.
Cumulative vs non-cumulative: a cumulative FD reinvests interest, which is what this tool models. A non-cumulative FD pays interest out periodically and does not compound to the same maturity.

Accuracy and limits

Compounding is fixed at quarterly. If your bank compounds on a different basis, or you choose a non-cumulative FD that pays interest out, the maturity will differ. The compound interest calculator lets you model other frequencies.

The figure is gross. Banks deduct TDS and the interest is taxable, so the amount you receive is lower.

It assumes you hold to maturity. An early withdrawal usually reduces the rate and the interest earned.

Senior-citizen and special-scheme rates aren't built in, so enter the exact rate your bank offers you.

Real-world uses

Estimate before booking

See an FD's likely maturity before you commit the money.

Compare banks and tenures

Check how a different rate or term changes the maturity.

Verify a quote

Sanity-check the maturity figure a bank shows you.

Plan a low-risk goal

Project what a lump sum will grow to when you plan a goal around a fixed deposit.

When it fits, and when it doesn't

Good for

Indian-style bank FDs (quarterly compounding)
Maturity estimates before booking
Comparing rates and tenures
Low-risk lump-sum planning

Not the best choice for

Monthly deposits
A different compounding basis
After-tax, in-hand figures

Depositing a fixed amount every month? Use the RD calculator. Want to choose the compounding frequency? Use the compound interest calculator. FD interest is taxable, so the maturity shown here is before tax.

Frequently asked questions

How is FD maturity calculated here?

With compound interest at a quarterly frequency: A = P × (1 + r/4) to the power of 4 times the years. The interest earned is the maturity minus your deposit.

Why quarterly compounding?

Most Indian banks calculate FD maturity that way, so the tool fixes the frequency at four periods a year to match.

What does ₹1,00,000 at 7% for 5 years mature to?

About ₹1,41,478, of which roughly ₹41,478 is interest, with interest compounded quarterly over the five years.

What's the difference between cumulative and non-cumulative?

A cumulative FD reinvests the interest each quarter and pays it all at maturity. That is the type this tool models. A non-cumulative FD pays interest out periodically, so it doesn't grow to the same maturity figure.

Is tax deducted from the result?

No. The maturity is gross. FD interest is taxable and banks deduct TDS, so your in-hand amount will be lower.

Can I change the compounding frequency?

Not here. It's fixed at quarterly to match bank practice. For yearly, monthly or daily compounding, use the compound interest calculator.

How is an FD different from an RD?

A fixed deposit is a single lump sum. A recurring deposit is a fixed amount paid in every month, and the RD calculator handles that case.

What happens if I withdraw early?

Banks usually apply a penalty and a lower rate for premature withdrawal. This calculator doesn't model that; it assumes you hold to maturity.

Are senior-citizen rates included?

No. Enter the rate your bank offers you, including any senior-citizen or special-scheme bonus, and the maturity updates.

Why is the effective rate higher than the rate I entered?

Quarterly compounding means interest earns interest four times a year, so the effective annual yield sits a little above the nominal rate you typed.

Is the rate fixed for the term?

Yes. A fixed deposit holds one rate for the whole tenure, and the calculation assumes the same.

What currency does it use?

Rupees, because FDs in India are quoted in rupees. The maths works the same for any currency.

References

The maturity follows A = P(1 + r/4)^(4y) for a cumulative fixed deposit compounded quarterly, as most Indian banks do. It is a gross figure, before TDS and income tax on the interest.

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