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FD Calculator

Estimate fixed deposit maturity amount and interest earned using deposit amount, rate, tenure, and compounding frequency.

Future payout-mode support. This release calculates cumulative maturity value only.

Status: initial

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Deposit estimate

Introduction

An FD calculator estimates the maturity amount and interest earned on a fixed deposit using deposit amount, interest rate, tenure, and compounding frequency.

What is FD?

A fixed deposit is a deposit product where money is placed for a defined tenure at a stated interest rate. Product terms, payout rules, taxes, and premature withdrawal rules vary.

FD formula

For cumulative fixed deposits, maturity value can be estimated using compound interest: A = P x (1 + r / n) ^ (n x t). Interest earned is maturity amount minus principal.

Variables explained

Deposit amount

The principal amount placed in the fixed deposit.

Annual interest rate

The stated annual rate used for the estimate, entered as a percentage.

Tenure

The deposit duration in years, months, or days.

Compounding frequency

How often interest is added to the deposit balance.

Maturity amount

The estimated value at the end of the selected tenure.

Interest earned

The estimated maturity amount minus deposit amount.

FD disclaimer

This calculator provides educational estimates only. It is not financial advice, a deposit recommendation, or a bank quote. Product terms, tax rules, premature withdrawal penalties, and payout rules can change actual results.

Formula guide

Maturity amount

A = P x (1 + r / n) ^ (n x t)

  • P is deposit amount.
  • r is annual interest rate as a decimal.
  • n is compounding periods per year.
  • t is tenure in years.

This estimates cumulative FD maturity value under compound interest.

Interest earned

Interest = A - P

  • A is maturity amount.
  • P is principal deposit amount.

Interest earned is the estimated growth above the original deposit.

Monthly compounding

n = 12

  • Interest is compounded twelve times per year.

More frequent compounding can slightly increase maturity value.

Quarterly and yearly compounding

n = 4 or n = 1

  • Quarterly uses four periods.
  • Yearly uses one period.

Many FD products use quarterly compounding, but product terms vary.

Worked examples

Quarterly compounding

  1. Deposit amount is 1,00,000.
  2. Annual interest rate is 7%.
  3. Tenure is 5 years.
  4. Quarterly compounding estimates maturity at about 1.41 lakh.

Monthly compounding

  1. Monthly compounding uses 12 periods per year.
  2. The same rate and tenure can produce a slightly different maturity value.
  3. Actual bank calculation rules may differ.
  4. Check product terms before making decisions.

Yearly compounding

  1. Yearly compounding adds interest once per year.
  2. It is simpler but may estimate lower than monthly or quarterly compounding.
  3. Use the frequency that matches the deposit product.
  4. Compare results only with the same assumptions.

Zero interest example

  1. Deposit amount is 50,000.
  2. Interest rate is 0%.
  3. Maturity amount remains 50,000.
  4. Interest earned is 0.

Common FD mistakes

Ignoring tax

Interest may be taxable depending on jurisdiction and user profile.

Using the wrong compounding frequency

Monthly, quarterly, half-yearly, and yearly compounding can produce different estimates.

Confusing payout and cumulative FD

This release estimates cumulative maturity value; payout-mode behavior can differ.

Ignoring premature withdrawal rules

Breaking an FD early may change the applicable rate or add penalties.

Treating estimates as product quotes

Actual bank or institution calculations depend on product-specific terms.

FAQs

What does an FD calculator estimate?
It estimates maturity amount and interest earned for a fixed deposit.
What formula does this FD calculator use?
It uses A = P x (1 + r / n) ^ (n x t) for cumulative compound interest.
What is maturity amount?
Maturity amount is the estimated value of the FD at the end of the tenure.
What is interest earned?
Interest earned is maturity amount minus the original deposit amount.
Which compounding frequencies are supported?
Monthly, quarterly, half-yearly, and yearly compounding are supported.
Can I enter tenure in months?
Yes. Choose months as the tenure unit.
Can I enter tenure in days?
Yes. Days are converted to years using a 365-day year for this estimate.
What happens at 0% interest?
Maturity amount equals the deposit amount and interest earned is 0.
Does this include tax?
No. Tax treatment is not included.
Does this include payout FD?
No. The payout option is a placeholder; this release estimates cumulative maturity.
Is FD interest guaranteed?
Terms depend on the institution and deposit product. This calculator is only an estimate.
What is FD vs RD?
An FD usually starts with one deposit amount, while an RD uses recurring deposits over time.
What is FD vs savings account?
An FD usually has a fixed tenure and rate, while savings accounts are more liquid and rates can vary.
Can premature withdrawal change the result?
Yes. Early withdrawal may change rates or add penalties.
Is this financial advice?
No. It is an educational estimate and not financial advice or a product quote.

References

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Last updated and version history

Last updated: 2026-07-04

  • 1.0.0 (2026-07-04): Initial production release with FD maturity estimate, interest earned, tenure units, compounding frequencies, and payout placeholder.