FD Calculator for Regular & Senior Citizens

HOW IT WORKS

How a fixed deposit calculator works

A fixed deposit (FD) is one of the simplest and safest ways to grow money: you lock a lump sum with a bank for a fixed period at a fixed interest rate, and in return the bank pays you a guaranteed return. A fixed deposit calculator turns the terms of that deposit — how much you put in, the rate, the tenure, and how often interest compounds — into a single maturity figure, so you know exactly what you will receive at the end.

For a cumulative FD, where interest is reinvested rather than paid out, the maturity value follows the compound-interest formula:

A = P × (1 + r/n)^n×t

Here P is your principal, r is the annual interest rate written as a decimal (7% becomes 0.07), n is the number of times interest is compounded each year, and t is the tenure in years. The interest you earn is simply the maturity amount minus what you deposited, A − P. The breakdown table above shows this one period at a time, so you can watch the balance grow as each round of interest is added.

A worked example

Deposit ₹1,00,000 at 7% for five years, compounded quarterly. There are four compounding periods a year, so over five years interest is added twenty times, each time at 7% ÷ 4 = 1.75% of the running balance. The deposit matures at about ₹1,41,478, meaning you earn roughly ₹41,478 in interest without ever touching the account. Because each quarter's interest joins the principal and then earns interest itself, the total is a little more than you would get from simple interest on the original ₹1,00,000. To see when that money arrives, find the date a fixed deposit matures by adding your tenure to the start date.

Maturity value at common rates (5-year FD)

Rates vary by bank and change over time, so rather than quote a specific bank's rate — which can go stale — here is what a ₹1,00,000 deposit becomes at illustrative rates over 5 years, quarterly compounded. Use this to check what rate a bank actually needs to offer to hit your goal:

Always compare banks on their current published rate before booking — this table shows the effect of the rate, not a live quote from any bank.

Why compounding frequency matters

Two FDs can advertise the same headline rate yet pay slightly different amounts, and the reason is compounding frequency. The more often interest is added to your balance, the sooner it starts earning interest of its own. At the same 7% nominal rate, monthly compounding beats quarterly, which beats half-yearly, which beats annual. The gap is small on short tenures but grows over time. The single number that captures this is the effective annual yield: 7% compounded quarterly is equivalent to about 7.19% compounded once a year. When you compare deposits across banks, comparing effective yields is fairer than comparing headline rates.

Cumulative versus non-cumulative FDs

A cumulative FD reinvests interest and pays it out together with the principal at maturity — that is what makes it compound, and it is what the calculator shows by default. A non-cumulative FD instead pays the interest out to you at regular intervals (monthly or quarterly), which suits retirees and anyone who wants a steady income stream rather than one lump sum years away. Switch the "Interest payout" toggle above to Monthly or Quarterly to model this: the principal is never touched and is returned in full at maturity, while each period pays out simple interest on that principal — Payout = Principal × rate ÷ payouts per year. Because the interest leaves the account instead of compounding, a non-cumulative FD's total payout over the same tenure is a little lower than the cumulative version's interest, for the same quoted rate.

The senior-citizen rate bonus

Indian banks almost universally pay depositors aged 60 and above an extra 0.50% per annum over the standard rate, on the same deposit and tenure — a handful of banks offer more on specific tenures, so it is worth checking your bank's own senior-citizen schedule. Tick "Senior citizen" above to see the effective rate and the maturity or payout figure it produces; the calculator applies the bonus to whatever rate you enter, so it works whether you are pricing a specific bank's published rate or a rate you are shopping for. Seniors should also price the government's Senior Citizens' Savings Scheme, which pays 8.2% a year, paid quarterly, for October–December 2026, more than most banks' senior rates, on up to ₹30 lakh per person.

Tax on FD interest

Fixed deposit interest is fully taxable. It is added to your income and taxed at your slab rate, and banks deduct TDS (tax deducted at source) once your interest for the year crosses the applicable threshold. The maturity figure is gross, so pick your slab in the calculator to see what you keep: at the 30% slab plus 4% cess, ₹12,941 of the default example's ₹41,478 interest goes in tax, leaving ₹1,28,537, and a 7% deposit earns roughly 4.82% a year after tax. TDS is not an extra tax: it is an advance payment counted against your final bill, and if your income is below the taxable limit you can submit Form 15G (15H if you are 60 or older) to stop it. If you fall in a higher slab, factor that in before comparing an FD against tax-advantaged options. In the 30% slab, for example, an equity SIP only needs to earn about 5.3% a year to match a 7% deposit after tax — see SIP vs FD returns compared after tax.

Premature withdrawal and laddering

Locking money away is the trade-off for a guaranteed rate. If you break an FD early, the bank typically pays interest only for the period the deposit actually ran, at the rate that applied to that shorter tenure, minus a small penalty of around 0.5% to 1%. One way to keep flexibility without giving up returns is laddering: split your money across several FDs with staggered maturities, so a portion becomes available at regular intervals while the rest keeps earning. This calculator assumes the deposit is held to its full tenure, which gives you the best-case maturity value to plan around.

How safe is a fixed deposit?

Fixed deposits are among the lowest-risk places to keep money, which is why they anchor so many conservative portfolios. In India, bank deposits are insured by the DICGC up to ₹5,00,000 per depositor per bank, covering both principal and interest, so even in the rare event of a bank failure your money up to that limit is protected. The trade-off for this safety is a modest return: over long horizons an FD will usually trail equity or a diversified SIP, and if its rate is close to inflation, your real (inflation-adjusted) return can be small. FDs are best used for capital you cannot afford to put at risk or money you will need on a known date, rather than for long-term wealth building.

Using your results

Start with the amount you can comfortably lock away and the date you expect to need it, then adjust the tenure and compounding frequency to see how the maturity value changes. Use the effective yield to compare offers on an equal footing, and download the period-by-period breakdown as a CSV if you want to keep a record or compare a few scenarios side by side. Remember that the real, post-tax return is what matters for your plan — treat the gross figure here as the starting point.