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Interest Calculator

Interest Calculator is a free online tool to calculate simple interest and compound interest on investments, savings, and loans. Instantly find interest earned, total maturity value, and long-term growth with accurate formulas.


Interest Calculator

Interest Calculator – Simple & Compound Interest Calculator Online

The Interest Calculator helps you accurately calculate interest earned, maturity amount, and total value on savings, investments, and loans. Whether your money grows through simple interest or compound interest, this calculator gives you instant clarity for better financial planning.

It is ideal for investors, students, borrowers, salaried individuals, and business owners who want quick and error-free interest calculations without manual effort.

What Is an Interest Calculator?

An Interest Calculator determines how much money you will earn or pay as interest over a specific time period based on:

  • Principal amount
  • Rate of interest
  • Time duration
  • Type of interest (Simple or Compound)
  • Compounding frequency (for compound interest)

It answers common questions like:

  • How much interest will I earn?
  • What will be the maturity amount?
  • Is simple or compound interest better?
  • How fast will my investment grow?

Types of Interest Calculated

🔹 Simple Interest

  • Interest calculated only on the principal
  • Principal remains constant throughout the tenure
  • Common in short-term loans and basic savings

Formula:

A = P (1 + rt)
SI = (P × R × T) / 100

🔹 Compound Interest

  • Interest calculated on principal + accumulated interest
  • Grows faster over time
  • Used in investments, FD, SIP, mutual funds

Formula:

CI = P × (1 + r/n)^(nt) − P

Key Features of the Interest Calculator

  • ✅ Supports Simple & Compound Interest
  • 📊 Shows interest earned & total maturity value
  • 🔁 Multiple compounding options (annual, monthly, etc.)
  • 💰 Works for any currency
  • ⏱️ Instant and accurate results
  • 📈 Helps compare investment options
  • 💻 100% online, no login required

How to Use the Interest Calculator

  1. Enter the principal amount
  2. Enter the interest rate
  3. Choose time period (months or years)
  4. Select Simple or Compound Interest
  5. Click Calculate
  6. View:
    • Interest earned
    • Total maturity amount

Example: Simple Interest Calculation

  • Principal: ₹100,000
  • Rate: 6%
  • Time: 5 years
SI = (100000 × 6 × 5) / 100 = ₹30,000
Total Amount = ₹1,30,000

Example: Compound Interest Growth

  • Principal: ₹1,000
  • Rate: 10%
  • Time: 2 years
CI = ₹210
Total Amount = ₹1,210

This demonstrates the power of compounding, where interest earns interest.

Why Use an Interest Calculator?

✔ Avoid manual calculation errors
 ✔ Save time
 ✔ Compare simple vs compound returns
 ✔ Plan investments and loans better
 ✔ Understand real growth of money

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