The SUPRAVAT.IN FD Calculator helps you estimate how much your fixed deposit will grow over its tenure. Enter your deposit amount, the interest rate, the tenure and the compounding frequency, and it instantly shows the maturity amount and the total interest earned — all formatted in Indian ₹.
What a fixed deposit is
A fixed deposit (FD) is a savings instrument where you deposit a lump sum with a bank or financial institution for a fixed period at a fixed interest rate. The money earns interest over the tenure and the full maturity amount is paid out at the end of the term. Because the rate is locked in, an FD offers predictable returns regardless of market fluctuations.
How an FD calculator works
An FD calculator applies the standard compound interest formula to your inputs. Used as an FD maturity calculator, it takes your deposit amount, annual interest rate, tenure and compounding frequency and computes the maturity amount in one step. Used as an FD interest calculator, it shows the total interest earned separately, so you can see exactly how much of your maturity value comes from interest growth.
How deposit amount affects maturity
The deposit amount is the principal on which interest is calculated. A larger deposit means interest is earned on a bigger base, so both the total interest and the maturity amount grow proportionally. Doubling the deposit (at the same rate and tenure) roughly doubles the interest earned and the maturity value.
How interest rate affects returns
The interest rate is the annual percentage your deposit earns. A higher rate compounds into a noticeably larger maturity amount, especially over longer tenures. Even a small rate difference adds up over several years, which is why comparing FD rates across banks before booking is useful. This fixed deposit interest calculator lets you test different rates and instantly see the impact.
How tenure affects maturity
Tenure is how long your money stays deposited. A longer tenure gives interest more time to compound, so the total interest earned and the maturity amount both increase when the rate is positive. You can calculate FD maturity for any tenure in years or months — the calculator converts months into the correct fraction of a year automatically.
How compounding frequency affects the final amount
Compounding frequency is how often the earned interest is added back to the principal so it can earn more interest. More frequent compounding means interest starts earning interest sooner, so the maturity amount is slightly higher. At the same rate, quarterly compounding gives a higher maturity than half-yearly, which in turn beats yearly compounding. The difference is small over short tenures but grows over longer ones.
FD maturity formula (compound interest):
Maturity Amount = P × (1 + r/n)n×t
Interest Earned = Maturity Amount − Deposit Amount
where P = deposit amount, r = annual interest rate as a decimal, n = compounding periods per year (Quarterly = 4, Half-Yearly = 2, Yearly = 1) and t = tenure in years.
At 0% interest, r = 0 and Maturity Amount = Deposit Amount, so Interest Earned = ₹0.
This FD calculator India tool provides estimates based on the inputs you enter. It does not promise any actual bank return. Real maturity values depend on the bank, the exact interest calculation method, compounding rules, tenure conventions, taxes and other terms set by the financial institution.
