Compound Interest Calculator

Compound interest is the eighth wonder of the world — money that earns interest on its interest, creating exponential growth over time. Our compound interest calculator shows you exactly how your principal grows with different compounding frequencies and rates.

Compound Interest Formula

A = P(1 + r/n)^(nt), where A = Final amount, P = Principal, r = Annual rate (decimal), n = Compounding periods per year, t = Time in years.

Compounding Frequencies

Annually (n=1): Interest added once per year. Quarterly (n=4): Interest added 4 times per year. Monthly (n=12): Most common for savings accounts and loans. Daily (n=365): Maximum compounding, used by some high-yield accounts.

Power of Compound Interest

₹1,00,000 at 10% for 20 years: Simple interest = ₹3,00,000. Compound interest (annual) = ₹6,72,750. Compound interest (monthly) = ₹7,32,857. The difference is the compounding effect — and it grows exponentially with time.