FD Calculator India – Post Office Fixed Deposit | PostOfficeCalculator.in

FD Calculator – India (Post Office & Bank Fixed Deposit)

Calculate maturity amount, interest earned, and see the step-by-step calculation. Perfect for Post Office TD, SBI, HDFC, ICICI, and other bank FDs.

Deposit Amount (₹)

Annual Interest Rate (%)

Time Period (Years)

Compounding Frequency

Principal Amount: ₹1,00,000

Total Interest Earned: ₹41,478

Maturity Amount: ₹1,41,478

📘 Step-by-step calculation

1. Principal (P) = ₹1,00,000, Rate (r) = 7.0% p.a., Time (t) = 5 years.

2. Compounding quarterly: n = 4. Formula: M = P × (1 + r/(100×n))^(n×t).

3. r/(100×n) = 7/(100×4) = 0.0175. So (1 + 0.0175) = 1.0175.

4. Exponent = n×t = 4×5 = 20. So (1.0175)^20 ≈ 1.41478.

5. Maturity = 1,00,000 × 1.41478 = ₹1,41,478. Interest = ₹41,478.

What is an FD Calculator?

An FD Calculator (Fixed Deposit Calculator) is a financial tool that estimates the maturity amount and interest earned on a fixed deposit. In India, Post Office Time Deposits and bank FDs are popular savings instruments. This calculator uses the standard compound interest formula (or simple interest, if selected) to give you accurate results.

FD Formula (Compound Interest)

M = P × (1 + r / (100 × n))^{n × t}

Where: M = Maturity amount, P = Principal, r = Annual interest rate (in %), n = Compounding frequency per year (4 for quarterly, 2 for half-yearly, 1 for yearly, 12 for monthly), t = Time in years.

For simple interest (no compounding): M = P + (P × r × t) / 100.

Example Calculation (Post Office FD – Quarterly Compounding)

Example: You deposit ₹2,00,000 in a Post Office FD at 7.5% p.a. for 3 years. Interest is compounded quarterly.

Step 1: P = 2,00,000, r = 7.5, t = 3, n = 4.
Step 2: Rate per quarter = 7.5 / (100 × 4) = 0.01875.
Step 3: Number of quarters = 4 × 3 = 12.
Step 4: Maturity factor = (1 + 0.01875)^12 = (1.01875)^12 ≈ 1.2496.
Step 5: Maturity = 2,00,000 × 1.2496 = ₹2,49,920. Interest ≈ ₹49,920.

Frequently Asked Questions (FAQ)

1. What is the FD interest calculation formula?

For compound interest: M = P × (1 + r/(100n))^(n×t). For simple interest: M = P + (P × r × t)/100.

2. How is Post Office FD interest calculated?

Post Office Time Deposits use quarterly compounding. The formula is M = P × (1 + r/400)^(4t), where r is the annual rate in percentage.

3. Can I use this calculator for bank FDs?

Yes, this calculator works for both Post Office and bank fixed deposits. Just choose the correct compounding frequency from the dropdown.

4. Is the interest earned taxable?

Yes, FD interest is taxable as per your income slab. TDS may apply if interest exceeds ₹40,000 (₹50,000 for senior citizens) in a financial year.

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