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Compound Interest Calculator

100% Free

Calculate compound interest on any deposit with daily, monthly, quarterly, or annual compounding.

A = P(1+r/n)^nt
Instant
Client-Side
4 Frequencies

Compound Interest

Total Amount
₹ 1,61,051.00
Principal 62%Interest 38%
Principal₹ 1,00,000.00
Total Interest₹ 61,051.00
Total Amount₹ 1,61,051.00
💡 Effective Rate

Annually compounding turns 10% nominal into 10% effective annual rate.

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How to Use

  1. 1 Enter the principal amount (your initial deposit or investment)
  2. 2 Enter the annual interest rate as a percentage
  3. 3 Select the compounding frequency — annually, quarterly, monthly, or daily
  4. 4 Set the time period using the slider or year preset buttons
  5. 5 See total amount, interest earned, and the effective annual rate instantly

Features

  • Formula: A = P × (1 + r/n)^(n×t) — standard compound interest
  • Four compounding frequencies: annually, quarterly, monthly, daily
  • Effective annual rate shown so you can compare products fairly
  • Year presets from 1 to 30 for quick scenario modelling
  • Rate presets from 5%–15% for common FD/savings rates
  • Visual principal vs interest breakdown bar

Why it Matters

Banks often advertise nominal rates but compound monthly or quarterly. The effective rate is what you actually earn. A 10% rate compounded monthly yields 10.47% effective — not 10%. This calculator makes that difference visible so you can compare FDs, RDs, savings accounts, and bonds accurately.

★★★★★

Use Cases

Fixed Deposits

Calculate FD maturity amount with quarterly compounding

Savings Goals

See how a lump sum grows in a savings account over time

Compare Products

Compare FD vs RD vs savings account by changing frequency

Loan Interest

Understand how compound interest accumulates on unpaid loans

Frequently Asked Questions

What is compound interest?
Compound interest is interest calculated on both the initial principal and the accumulated interest. A = P(1 + r/n)^(n×t), where n is the compounding frequency per year.
What is the difference between nominal and effective rate?
The nominal rate is what's advertised. The effective annual rate accounts for compounding within the year. More frequent compounding means a higher effective rate.
Which compounding frequency is best for investors?
Daily compounding gives the highest return for the same nominal rate. However, the difference between daily and monthly compounding is usually less than 0.1% for typical rates.
Does Indian FD compound quarterly or annually?
Most Indian bank FDs compound quarterly by default, though some compound monthly. Check your FD agreement — using the wrong frequency will give inaccurate projections.

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