Compound Interest Calculator
Instant results as you type.
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years
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For education and planning only. Your bank or lender’s actual figures can differ — fees, rounding, day-count conventions and local rules vary. Always confirm the final numbers with your provider before deciding.
A compound interest calculator shows how savings or investments grow when you earn interest on your interest, not just on the original amount. You choose the principal, the annual rate, the number of years, and how often interest compounds — yearly, quarterly, monthly, and so on. More frequent compounding grows money slightly faster. It all runs in your browser.
How to use it
- Enter the principal, the annual interest rate, and the number of years.
- Choose how many times a year interest compounds.
- See the maturity amount and the total interest earned.
Examples
- ₹1,00,000 at 10% for 2 years, compounded yearly → ₹1,21,000.
- The same amount compounded monthly → about ₹1,22,039.
Frequently asked questions
- What is the compound interest formula?
- 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 how many times a year it compounds, and t is the number of years. The interest earned is A − P.
- How is compound different from simple interest?
- Simple interest is calculated only on the original principal, so it grows in a straight line. Compound interest is calculated on the principal plus all previously earned interest, so it accelerates over time. The longer the period, the bigger the gap.
- Does compounding frequency matter?
- Yes, but less than people expect. More frequent compounding — monthly versus yearly — earns a little more, because interest starts earning interest sooner. Over long periods and higher rates the difference grows.
- How does FD compounding work in India?
- Most Indian bank fixed deposits compound quarterly. Our FD calculator uses that convention specifically; this compound interest calculator lets you pick any frequency to model other products.