Fixed Deposit (FD) Calculator

A fixed deposit calculator estimates the maturity value of a bank FD before you invest. Enter the principal, annual interest rate, tenure, and compounding frequency, and it applies the compound-interest formula A = P(1 + r/n)^(nt) to show your maturity amount, total interest earned, and effective yield instantly.

Most Indian banks compound FD interest quarterly using A = P(1 + r/n)^(nt), where P is the principal, r the annual rate as a decimal, n the compounding periods per year, and t the tenure in years. Example: Rs. 20,000 at 10% per annum for 4 years compounded quarterly gives 20,000 x (1.025)^16 = Rs. 29,690.11.

Compounding frequency (n) is how often interest is added to your principal each year — monthly (12), quarterly (4), half-yearly (2), or yearly (1). More frequent compounding means interest starts earning its own interest sooner, so the maturity value is higher for the same rate and tenure.

For the same principal, rate, and tenure, monthly compounding gives the highest maturity value. For example, Rs. 1,00,000 at 7% per annum for 5 years grows to Rs. 1,41,762.53 with monthly compounding, Rs. 1,41,477.82 with quarterly compounding, and Rs. 1,40,255.17 with yearly compounding.

Effective yield is the actual annual return after compounding, calculated as (maturity value / principal) - 1. Because of compounding, it is slightly higher than the nominal rate: 6.5% per annum compounded monthly has an effective yield of 6.6972%.

Yes — Indian banks typically offer senior citizens about 0.50% per annum extra on FD rates. This calculator includes an optional senior-citizen toggle that adds 0.50% to your rate. Example: Rs. 2,00,000 at 7% for 5 years compounded quarterly matures to Rs. 2,82,955.64, versus Rs. 2,89,989.61 at 7.50% — Rs. 7,033.97 more.

Yes. Enter years and months separately; the tenure is converted to years (1 year 6 months = 1.5 years) before applying the formula. Example: Rs. 50,000 at 6.5% per annum for 1 year 6 months compounded quarterly matures to Rs. 55,077.39, earning Rs. 5,077.39 in interest.

With a 0% rate the maturity value equals the principal — you get back exactly what you deposited, with no interest. This calculator handles that edge case: A = P.

A simple-interest FD pays M = P + (P x r x t/100) with no compounding, while a compound-interest FD reinvests each period's interest using A = P(1 + r/n)^(nt). Example: Rs. 1,00,000 at 10% for 5 years gives Rs. 1,50,000 under simple interest but Rs. 1,61,051 with annual compounding.

Yes, FD interest is added to your taxable income and taxed at your slab rate, and banks may deduct TDS on the interest. This calculator shows pre-tax maturity values only; consult a tax professional or your bank for the current TDS rules before investing.

Most banks allow premature withdrawal but charge a penalty — usually a reduction in the applicable interest rate — so you earn less than the contracted rate. Terms vary by bank, so always check the premature-withdrawal clause before booking an FD.

No. Results are illustrative estimates based on the standard compound-interest formula and the inputs you provide. Actual maturity values depend on your bank's exact rates, compounding method, tenure slabs, taxes, and penalties. This tool is for education and planning only — not financial advice.