Home / Financial / FD Calculator
Enter your values and click Calculate to see your result.
A fixed deposit is one of the simplest ways to grow savings without taking on market risk: you lock a lump sum away for a set period, the bank pays you a fixed rate of interest, and you get the whole amount back at maturity. The only question is how much that final amount will be. This free FD calculator answers it in seconds — type in your deposit, rate, and tenure, and it shows your maturity value and the interest you will earn.
How to Use This FD Calculator
Enter the amount you plan to deposit, then the annual interest rate your bank is offering — 7% is filled in as a starting point. Next, enter the tenure in years; half-years are allowed, so 2.5 years works fine. Finally, pick how often the interest compounds. Quarterly is the most common choice for fixed deposits and is pre-selected, but you can switch to yearly, half-yearly, or monthly. Press Calculate and you will see three numbers: the maturity value, the total interest earned, and your original deposit for reference. Press Clear to reset the form and try different figures.
What Is a Fixed Deposit?
A fixed deposit, often shortened to FD, is a savings product in which you deposit a sum of money for a fixed term — anywhere from a few months to ten years — at an agreed interest rate that does not change during the term. Unlike a regular savings account, you cannot withdraw the money freely; taking it out early usually means a penalty and a lower rate. In exchange, the bank pays a higher rate than a savings account, and the return is guaranteed. That certainty is the whole appeal: you know on day one exactly what you will get back on the maturity date.
Fixed deposits suit money you will not need for a while — an emergency fund, savings for a goal a few years away, or funds set aside for retirement. They appeal to savers who prefer a predictable return over the ups and downs of the stock market. The trade-off is that your money is tied up, and if rates rise after you lock in, your deposit keeps earning the older, lower rate. If you would rather save gradually with monthly contributions instead of a lump sum, our SIP calculator is the better tool for that plan.
The FD Formula
The maturity value of a fixed deposit comes from the compound interest formula. Your deposit grows by the interest rate divided by the number of compounding periods per year, and that growth repeats for every period across the full tenure. In short, it uses the compound interest formula: maturity = deposit × (1 + annual rate ÷ compounding periods)periods × years. Try it in the calculator above.
A = P × (1 + r ÷ n)n × t
Here, A is the maturity value, P is the deposit, r is the annual rate as a decimal (7% becomes 0.07), n is how many times per year interest compounds, and t is the tenure in years. The interest you actually earn is simply the maturity value minus the deposit. With simple interest, you earn interest only on your original deposit. With compound interest — which almost all FDs use — you also earn interest on interest already added, so your balance grows faster:
Interest earned = A − P
Monthly compounding pays slightly more than yearly compounding, because interest starts earning its own interest sooner — a small gap over one year that grows over five or ten. So yes, the frequency matters: monthly compounding pays a little more than quarterly, which pays a little more than yearly — and over a long tenure the gap becomes noticeable.
Worked Example
Suppose you deposit $50,000 at 7% per year, compounded quarterly, for 5 years: A = $50,000 × (1 + 0.07 ÷ 4)4 × 5 = $50,000 × (1.0175)20 = $70,738.91. Your interest earned is $70,738.91 − $50,000 = $20,738.91. That is the power of compounding: the interest itself keeps earning interest every quarter, so the balance grows a little faster each year.
The same $50,000 at 7% compounded quarterly for 3 years matures to about $61,571.97, earning $11,571.97 in interest. Stretch it to 10 years and it reaches roughly $100,079.87 — your money roughly doubles. Time does as much work as the rate itself, which is why starting an FD earlier beats waiting for a slightly better rate.
How Maturity Changes With Rate and Tenure
The table below shows what a $50,000 deposit becomes at different rates and tenures, all compounded quarterly.
| Annual rate | 3 years | 5 years | 10 years |
|---|---|---|---|
| 5% | $58,037.73 | $64,101.86 | $82,180.97 |
| 6% | $59,780.91 | $67,342.75 | $90,700.92 |
| 7% | $61,571.97 | $70,738.91 | $100,079.87 |
| 8% | $63,412.09 | $74,297.37 | $110,401.98 |
A single percentage point makes a real difference over a decade: at 5% your $50,000 becomes about $82,181, while at 8% it becomes about $110,402. Always compare the rate on offer against what other banks are paying before you lock in.
Tips and Limitations
First, remember that this calculator gives an estimate. Rates vary by bank, by tenure, and sometimes by the size of the deposit, and banks can change their rates at any time — the figure your bank actually quotes is the one that counts. Second, the result shown is before any tax on the interest, which in many countries is taxable income, so your after-tax return will be lower. Third, watch out for early-withdrawal penalties: pulling money out before maturity usually costs you part of the interest, so only deposit money you are confident you will not need. Finally, consider splitting a large sum into several smaller FDs with different maturities — a ladder — so some money frees up regularly instead of everything being locked until one distant date. If you want to compare the FD return with pure compounding on a lump sum, try our compound interest calculator. The maturity value shown here is an estimate based on the rate you enter, not a guarantee. Actual rates vary by bank and can change, and taxes on interest are not included. Always confirm the rate and terms with your bank before depositing.
A fixed deposit will not make you rich overnight, but it turns idle savings into steady, predictable growth — run your numbers above, pick a tenure you can stick to, and let compounding do the work.