FD Calculator (Fixed Deposit)
A fixed deposit calculator computes the maturity amount and total interest you earn on a lump-sum deposit, based on the principal, rate, tenure and how often interest compounds.
Last updated 2026-08-14
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quizExample
How this calculator works, with real numbers (no JavaScript needed):
Inputs
- Deposit amount
- 100000
- Interest rate
- 7
- Tenure
- 5
- Compounding frequency
- quarterly
- Interest payout (not cumulative)
- false
Results
- Maturity value
- ₹1,41,477.82
- Total interest
- ₹41,477.82
- Principal invested
- ₹1,00,000
functionsThe formula
A fixed deposit (FD) is one of the safest savings instruments in India. You deposit a lump sum for a fixed tenure at an agreed interest rate, and the bank returns your principal plus interest at maturity. Interest is typically compounded quarterly.
The formula
Maturity = P × (1 + r/m)^(m × t)
- P — deposit amount
- r — annual interest rate (as a decimal)
- m — compounding periods per year (usually 4 for quarterly)
- t — tenure in years
Worked example
Deposit ₹1,00,000 at 7% for 5 years, compounded quarterly:
- Maturity = 1,00,000 × (1 + 0.07/4)^(4 × 5) = 1,00,000 × (1.0175)²⁰ ≈ ₹1,41,478
You earn ₹41,478 in interest. If you choose interest payout instead, the bank pays the interest out each period and returns only your ₹1,00,000 principal at maturity — useful if you want regular income.
Things to know
- Senior citizens usually earn 0.5% more on FDs — ask your bank.
- Interest earned on FDs is taxable as per your income-tax slab (TDS is deducted above certain limits), so factor that into your effective return.
- 5-year tax-saver FDs qualify for a deduction under Section 80C, but lock in your money for 5 years.
helpFrequently asked questions
question_markHow is FD interest calculated?
Fixed deposits in India usually compound interest quarterly. Maturity = P × (1 + r/4)^(4 × t), where P is the deposit, r the annual rate and t the tenure in years.
question_markIs FD interest taxable?
Yes. Interest from fixed deposits is added to your income and taxed per your slab. Banks deduct TDS on interest above certain thresholds. A 5-year tax-saver FD can give a deduction under Section 80C.
question_markWhat is a cumulative vs non-cumulative FD?
In a cumulative FD, interest is reinvested and paid at maturity. In a non-cumulative FD, interest is paid out periodically (monthly/quarterly/yearly), which is useful for regular income.