Our compound interest calculator shows exactly how your investments grow over time. Calculate future value with any compounding frequency and optional monthly contributions.
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Compound Interest Formula
A = P × (1 + r/n)^(n×t)
P = Principal | r = Annual rate (decimal) n = Compounding frequency/year | t = Time in years
₹1,00,000 at 10% for 10 years (monthly): A = 1,00,000 × (1+0.10/12)^120 = ₹2,70,704 Interest Earned = ₹1,70,704 (170.7%)
Rule of 72
Years to double = 72 ÷ interest rate. At 10%: 72 ÷ 10 = 7.2 years to double your money.
Frequently Asked Questions
Simple interest is calculated only on the principal amount throughout the investment period. Compound interest is calculated on the principal plus accumulated interest, leading to exponential growth over time.
More frequent compounding (daily or monthly) yields slightly higher returns than annual compounding for the same nominal interest rate, because interest is added to the principal more often.