Compound Interest Calculator
Calculate compound interest with any compounding frequency.
🔒 Runs entirely in your browser — nothing is uploaded.
How Compound Interest Calculator works
How does the compound interest calculator work?
It applies the classic compound interest formula A = P × (1 + r/n)^(n×t), where P is your principal, r is the annual rate as a decimal, n is the compounding frequency, and t is the number of years. You can pick n as annually, semi-annually, quarterly, monthly, or daily, and the interest earned is just the final amount minus the principal.
When would I use this?
Use it to see how a lump-sum deposit, such as a fixed deposit, savings account, or bond, grows over time, and to compare how compounding more frequently (say monthly versus annually) changes the final balance at the same nominal rate. It is also a handy way to grasp why compounding frequency matters more as the time horizon stretches out.
What does it assume?
The calculation is for a single upfront principal only - it does not model recurring deposits or withdrawals during the term, and it assumes the interest rate stays constant for the entire period. For a scenario with regular monthly contributions instead of a one-time deposit, the SIP Calculator is a better fit.