What is the FD calculator?
The fixed deposit (FD) calculator estimates the maturity amount on a one-time bank or financial institution deposit. You lock in a lump sum for a chosen tenure at a stated annual interest rate; the tool details the total invested amount, interest earned, and maturity value.
Fixed deposits are a staple of conservative financial planning, offering a guaranteed rate of interest that remains unaffected by market fluctuations. While savings accounts provide low, variable returns, FDs lock your rate, making them ideal for shielding capital meant for near-term milestones.
A ₹1,00,000 FD for 5 years at 7% p.a. (compounded quarterly) is estimated at about an illustrative maturity amount, with roughly estimated interest in interest on your principal principal. Compare other principals on the FD calculator.
How do FD calculators work?
Most commercial banks in India compound interest on a quarterly basis. This means interest is calculated and added to your principal four times a year, allowing you to earn interest on interest.
Some calculators mistakenly apply simple annual interest or monthly compounding, which overstates or understates your real return. Our calculator applies standard quarterly compounding to align with reserve bank rules.
M = P × ( 1 + r / n )n × t
Where –
| M | Maturity value |
|---|---|
| P | Principal deposit amount |
| r | Annual interest rate (as a decimal) |
| n | Compounding frequency per year (4 for quarterly) |
| t | Investment tenure in years |
Example: ₹1,00,000 at 7% p.a. for 5 years with quarterly compounding → M ≈ ₹1,41,478
Worked example: Compounding over a 5-year lock-in
Let's trace a ₹1,00,000 fixed deposit locked for 5 years at an interest rate of 7% p.a., with standard quarterly compounding. First, we write the interest rate as a decimal: r = 0.07. Since compounding is quarterly, the frequency factor n is 4, which means interest compounds 20 times over the 5-year tenure (4 × 5).
Plugging these parameters into the formula: M = 1,00,000 × (1 + 0.07 / 4)^(4 × 5). This simplifies to M = 1,00,000 × (1.0175)^20. Compounding over the twenty quarters yields a growth multiplier of approximately 1.414778.
Multiplying this by your ₹1,00,000 principal results in a final maturity value of ₹1,41,478. This includes ₹41,478 in estimated interest gains. Had you used simple interest instead of compounding, your gains would be ₹35,000—meaning quarterly compounding added ₹6,478 in extra earnings.
The Friction Section: Premature Penalty and Tax Leakage
A fixed deposit calculator assumes your money remains locked and grows without tax interference. Real-world returns face penalty and tax leakage.
First, consider Tax Deducted at Source (TDS). Indian banks deduct 10% TDS on FD interest if it exceeds ₹40,000 (₹50,000 for senior citizens) in a financial year. If you do not submit Form 15G/15H, this tax is deducted automatically, dragging down compounding power. Additionally, this interest is added to your income and taxed at your slab rate, meaning high-income investors face substantial tax drag.
Second, watch out for premature withdrawal penalties. If you must break your FD early for emergency liquidity, banks typically penalize you by reducing the applicable interest rate by 0.5% to 1% for the period the deposit was actually held.
Our Take: Why the Safety of Fixed Deposits is an Inflation Illusion
In our experience, while fixed deposits provide safety from market volatility, they suffer from a silent erosion of purchasing power due to inflation. If you lock your money in a 7% FD and inflation runs at 6%, your real rate of return is just 1%. If you are in the 30% tax bracket, your post-tax return of 4.9% is actually lower than inflation, resulting in a net loss of wealth over time.
We recommend building a fixed deposit ladder. Instead of putting all your money in a single 3-year FD, split it into three parts: one in a 1-year FD, one in a 2-year FD, and one in a 3-year FD. As each FD matures, reinvest it in a new 3-year FD. This strategy gives you regular liquidity and lets you benefit from rising interest rates.
How to use this FD calculator
Set your total investment, enter your annual interest rate (p.a.), and choose the tenure in years or months. The results show total principal invested, estimated interest, and final maturity amount.
For monthly recurring deposits instead of a lump sum, try the RD calculator. To calculate the impact of inflation on your savings, use the inflation calculator.
Frequently asked questions
Is FD interest compounded monthly or quarterly?
Most commercial banks in India compound fixed deposit interest quarterly. This calculator uses standard quarterly compounding, but some corporate FDs compound monthly or half-yearly. Check your deposit receipt to verify.
What is the difference between cumulative and non-cumulative FDs?
Cumulative FDs compound interest and pay it all at maturity, maximizing growth. Non-cumulative FDs payout interest at regular intervals (monthly, quarterly, or annually), which is useful for regular income but halts compounding.
Are fixed deposit returns completely risk-free?
No investment is entirely risk-free, but bank FDs are extremely safe. Under the DICGC scheme, deposits in Indian banks are insured up to ₹5 lakh per bank per depositor, covering both principal and interest.