Compound Interest Calculator
Calculate investment growth, maturity amount, monthly contribution return and compound earnings instantly
Compound Growth Result
Pro tip
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Compound Interest Calculator
What Is a Compound Interest Calculator?
A compound interest calculator is a free online tool that projects how any sum of money grows over time when interest is earned on both the principal amount and accumulated interest — the financial phenomenon famously described as “interest on interest.” Enter four inputs and get your complete savings or investment projection in seconds.
Compound Interest Formula Explained
Every compound interest calculation uses this standard formula:
A = P × (1 + r/n)^(n×t)
Where:
- A = Final amount (future value)
- P = Principal (initial investment or deposit)
- r = Annual interest rate (decimal)
- n = Compounding frequency per year
- t = Time in years
Quick example: ₹1,00,000 invested at 8% annual interest, compounded monthly for 10 years: A = 1,00,000 × (1 + 0.08/12)^(12×10) = ₹2,21,964 — more than double your money.
Compounding Frequency Comparison — Same Rate, Different Results
| Frequency | ₹1,00,000 at 8% for 10 Years |
|---|---|
| Annually | ₹2,15,892 |
| Quarterly | ₹2,20,804 |
| Monthly | ₹2,21,964 |
| Daily | ₹2,22,535 |
More frequent compounding = faster growth. This is why daily compounding in savings accounts and FDs always outperforms annual compounding at the same stated rate.
Why Use Click2Calculate’s Compound Interest Calculator?
- ✅ All compounding frequencies — daily, weekly, monthly, quarterly & annual
- ✅ Regular contributions — add monthly or annual deposits to model SIPs and savings plans
- ✅ Simple vs compound interest comparison — see exactly how much more compounding earns
- ✅ Rule of 72 shortcut — estimate how many years to double your money at any rate
- ✅ Works for savings, FDs, loans & investments — one tool, every use case
Whether you are planning retirement savings, comparing FD returns, projecting SIP growth, or calculating loan interest, this free compound interest calculator online shows you the power of compounding — instantly and accurately.