Compound Interest Calculator
Compound interest is often called the eighth wonder of the world because it earns returns not just on your principal but also on the interest already accumulated. Over long periods, this snowball effect can dwarf the original investment. This compound interest calculator lets you explore that effect for any scenario. Enter the principal, the annual interest rate, the time period, and how often interest compounds — yearly, half-yearly, quarterly, monthly, or daily — and it shows the maturity value and total interest earned. More frequent compounding produces slightly higher returns at the same rate. Whether you are evaluating a deposit, a loan, or a long-term investment, this tool makes the maths behind compounding clear and instant.
Total Amount
₹2,15,893
Principal
₹1,00,000
Total Interest
₹1,15,893
About the Compound Interest Calculator
A compound interest calculator computes how much an amount grows when interest is periodically added back to the balance, so future interest is earned on a larger sum. The more frequently interest compounds, the faster the balance grows.
Why it is useful
Compounding is the engine behind every long-term investment, but its effect is hard to estimate mentally. This tool shows exactly how principal, rate, time, and frequency interact, helping you compare products and appreciate why starting early matters so much.
How the calculation works
The formula is A = P × (1 + r/n)^(n × t), where P is the principal, r is the annual rate (as a decimal), n is the number of compounding periods per year, and t is the time in years. The total interest is A minus P. Increasing n raises the maturity value for the same rate.
Key inputs explained
- Principal: The starting amount you invest or borrow.
- Interest rate: The annual rate of interest.
- Time & frequency: The duration in years and how often interest compounds.
Example calculation
Inputs
- Principal
- ₹1,00,000
- Interest rate
- 8% p.a.
- Time / frequency
- 10 years / quarterly (n = 4)
Calculation breakdown
- Rate per period
- 8% ÷ 4 = 2%
- Number of periods
- 4 × 10 = 40
- A formula
- 1,00,000 × (1.02)^40
Your ₹1 lakh more than doubles to about ₹2.21 lakh. Annual compounding at the same 8% would yield about ₹2.16 lakh, so compounding quarterly adds roughly ₹5,000.
Benefits
- Reveals the long-term power of reinvested returns.
- Compares the effect of different compounding frequencies.
- Works for investments, deposits, and loans alike.
Limitations
- Assumes a constant rate throughout the period.
- Does not account for taxes on the interest earned.
- Real investments rarely compound at a perfectly fixed rate.
Tips
- Start early — time is the most powerful variable in compounding.
- Reinvest interest and dividends to keep the snowball rolling.
- Prefer products that compound more frequently at the same rate.
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About this calculator
The Compound Interest Calculator is built and maintained by the PaisaBot team. All calculations run instantly in your browser using established financial formulas, and we use high-precision arithmetic to keep the results reliable.
Data accuracy: Interest rates, tax slabs, and scheme rules are updated periodically, but figures can change with RBI, government, and lender revisions. Always confirm the latest rates with your bank or an official source before acting.
Educational purpose: This tool is provided for general information and financial education only. It does not constitute investment, tax, or legal advice. For decisions specific to your situation, please consult a qualified financial advisor.