Quick Answer
Fixed Deposit (FD) maturity value is calculated using the compound interest formula: Maturity = P × (1 + r/n)^(n×t), where P is the deposit amount, r is the annual interest rate, n is the compounding frequency, and t is the tenure in years.
What Is a FD Calculator?
A Fixed Deposit (FD) — also called a Term Deposit in some countries — is a savings product offered by banks where you deposit a lump sum for a fixed period at a guaranteed interest rate, in exchange for agreeing not to withdraw the funds early. In return for this commitment, banks typically offer a higher interest rate on FDs than on regular savings accounts.
FD interest is almost always compounded — most commonly quarterly or annually, depending on the bank — meaning the interest earned in one period is added to the principal before calculating interest for the next period. This makes the actual return higher than what a simple-interest calculation would suggest, especially for longer tenures.
FDs are popular for their predictability: the interest rate is locked in at the time of deposit and doesn't change with market fluctuations, unlike many other investments. This makes them attractive for risk-averse savers, but it also means FD returns can lag behind inflation during high-inflation periods, since the rate is fixed regardless of how prices rise.
How to Use This FD Calculator
- 1Enter the deposit amount (principal).
- 2Enter the annual interest rate offered by the bank.
- 3Select the compounding frequency (quarterly is most common for FDs).
- 4Enter the deposit tenure in months or years.
- 5The calculator returns the maturity amount and total interest earned.
The Formula Explained
Maturity = P × (1 + r/n)^(n×t)P = principal, r = annual rate, n = compounding frequency per year, t = years
Interest = Maturity − PExample: PKR 500,000 FD at 13% annual interest, compounded quarterly, for 2 years
- P = 500,000, r = 0.13, n = 4 (quarterly), t = 2
- Maturity = 500,000 × (1 + 0.13/4)^(4×2)
- Maturity = 500,000 × (1.0325)^8
- Maturity ≈ 645,860
Tips & Things to Know
- Breaking an FD before maturity usually triggers a penalty — typically a reduced interest rate for the period the money was actually held — so only commit funds you won't need during the tenure.
- Compare the compounding frequency across banks, not just the headline rate — a slightly lower rate with more frequent compounding can sometimes yield a similar or better return than a higher rate compounded less often.
- FD interest is generally taxable as income in most countries — factor this into your real (after-tax) return when comparing FDs to other investment options.
- Laddering FDs (splitting funds across multiple FDs with staggered maturity dates) can provide periodic liquidity while still earning FD-level interest on most of your funds.