The Fixed Deposit (FD) Calculator determines maturity amounts and total accrued compound interest for bank term deposits using standard quarterly compounding schedules.

### Compound Interest Formula Fixed deposits in commercial banking frameworks typically compound interest on a quarterly basis ($n = 4$ times per year): - **Quarterly Compounded Maturity Value**: $$A = P \times \left(1 + \frac{r}{4}\right)^{4 \times t}$$ where: - $P$ is the principal deposit amount. - $r$ is the annual nominal interest rate in decimal form (e.g. $7.5\% = 0.075$). - $t$ is the deposit tenure in full years. - **Total Interest Yield**: $$\text{Earned Interest} = A - P$$

### Worked Calculation Example Investing a principal deposit of $100,000 at an annual interest rate of 7.5% for a tenure of 5 years: - **Quarterly Rate Factor**: $1 + (0.075 / 4) = 1 + 0.01875 = 1.01875$ - **Total Compounding Periods**: $4 \times 5 = 20\text{ quarters}$ - **Compound Multiplier**: $(1.01875)^{20} \approx 1.449948$ - **Maturity Amount**: $\$100{,}000 \times 1.449948 = \$144{,}995$ - **Total Interest Earned**: $\$144{,}995 - \$100{,}000 = \$44{,}995$

### In-Browser Processing & Privacy Calculations update dynamically in your web browser. No deposit amounts, account balances, or financial details are transmitted across the internet.