Free Interest Calculator Online - BSR Tools

What is the BSR Interest Calculator?

The BSR Interest Calculator computes both Simple Interest (SI) and Compound Interest (CI) with support for various compounding frequencies — yearly, half-yearly, quarterly, and monthly. Designed for Indian savers and government employees, it includes one-click presets for popular government savings schemes like PPF, NSC, SCSS, Sukanya Samriddhi Yojana, and Fixed Deposits. The tool generates a visual bar chart showing year-wise growth and a detailed breakdown table, helping you make informed investment decisions.

Simple Interest vs Compound Interest — Key Differences

Simple Interest is calculated only on the principal amount and grows linearly: SI = (P × R × T) / 100. Compound Interest is calculated on both the principal and accumulated interest, creating exponential growth: CI = P × (1 + R/n)^(n×T) − P, where n is the compounding frequency per year. For long-term investments, compound interest generates significantly more returns. A ₹1,00,000 investment at 7% for 15 years gives ₹1,05,000 in simple interest but ₹1,75,903 in compound interest (compounded yearly) — a difference of ₹70,903.

Government Savings Scheme Rates (2026)

• PPF (Public Provident Fund): ~7.1% compounded yearly, 15-year lock-in, tax-free returns under Section 80C
• NSC (National Savings Certificate): ~7.7% compounded yearly, 5-year maturity, tax deduction under 80C
• SCSS (Senior Citizens Savings Scheme): ~8.2% quarterly payout, 5-year tenure, ideal for retirees
• SSY (Sukanya Samriddhi Yojana): ~8.0% compounded yearly, for girl child education, 21-year maturity
• Post Office FD: ~7.0-7.5% depending on tenure, compounded quarterly
• Bank FD: 6.5-7.5% for general, 7.0-8.0% for senior citizens, compounded quarterly

Note: Government scheme rates are revised quarterly by the Ministry of Finance. Always check the latest gazette notification for current rates.

How to Use the Interest Calculator

1. Choose mode: Simple Interest or Compound Interest
2. Enter principal amount: The initial investment amount in rupees
3. Set interest rate: Annual percentage rate, or use a preset button for government schemes
4. Enter time period: Duration in years using the input or slider
5. Select compounding frequency (CI only): Yearly, half-yearly, quarterly, or monthly
6. Click Calculate: View maturity amount, total interest earned, growth chart, and year-wise breakdown

Investment Tips for Government Employees

Government employees should maximise their Section 80C deductions through PPF, NPS, and ELSS before considering taxable investments. PPF offers the best risk-free, tax-free return among government schemes. Start PPF contributions early in your career — the 15-year lock-in with extensions means your money compounds for decades. SCSS is excellent for retirement planning as it provides quarterly income. For Sukanya Samriddhi, the earlier you start after your daughter's birth, the more the compounding effect works in your favour. Compare the after-tax returns of FDs with PPF — even though FD rates may sometimes be higher, the tax-free nature of PPF often makes it more beneficial for investors in the 20-30% tax bracket.