Compound Interest Calculator
See how your money grows with compounding. Enter the principal, rate, time, and compounding frequency below.
Common Compound Interest Examples
Sample maturity values for popular principal, rate, and time combinations (monthly compounding) — use the calculator above for your own numbers.
- ₹1,00,000 at 8% for 5 years
Maturity ≈ ₹1,48,985 - ₹50,000 at 7% for 10 years
Maturity ≈ ₹1,00,483 - ₹2,00,000 at 9% for 3 years
Maturity ≈ ₹2,61,729 - ₹10,000 at 6% for 20 years
Maturity ≈ ₹33,102
What is Compound Interest?
Compound interest is interest calculated on both the original principal and the accumulated interest from previous periods — often called "interest on interest." The more frequently interest compounds (monthly vs. annually), the faster your money grows. The formula is: A = P × (1 + r/n)n×t, where P is principal, r is annual rate, n is compounding frequency per year, and t is time in years.
Does compounding frequency really matter?
Yes. Monthly compounding grows your money faster than annual compounding at the same stated rate, because interest is calculated and added more often. The difference becomes more noticeable over longer time periods and higher rates.
How is this different from simple interest?
Simple interest is always calculated on the original principal only, so it grows at a constant amount each year. Compound interest grows faster because each period's interest gets added to the principal before the next calculation. Try our Simple Interest Calculator to compare the two.