Tool
Calculators · Online utility
Compound Interest Calculator — lump sum + optional monthly SIP, compounding frequency, inflation-adjusted purchasing power, yearly breakdown, and growth chart.
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Inputs on the left, structured output on the right.
Fill inputs and click Run Tool to generate results.
Insights will appear as soon as valid values are entered.
Straightforward expectations for how Compound Interest Calculator fits your workflow.
Disclaimer: Calculator outputs depend on correct inputs and stated assumptions. Confirm numbers with a qualified professional when stakes are high.
Documentation
Project how a lump sum and optional monthly contributions (SIP) grow with your chosen compounding frequency. See maturity value, total interest, illustrative nominal CAGR, inflation-adjusted purchasing power, a year-by-year schedule, and a simple growth chart—ideal for mutual funds, FDs, and long-term goals.
What is compound interest?
Compound interest means you earn returns on your principal and on interest that was reinvested. Compared with simple interest, growth can accelerate over long horizons—especially when you add regular contributions and reinvest earnings.
Compounding levers
Lump sum future value: A = P × (1 + r/n)^(n×t) where r = annual rate, n = compounds per year, t = years.
This tool uses an equivalent monthly rate so month-by-month schedules align with your chosen n.
Total invested = initial principal + (monthly contribution × number of months).
Interest earned = maturity value − total invested.
Nominal CAGR (illustrative) ≈ (maturity ÷ total invested)^(1/t) − 1.
Real CAGR (after inflation) ≈ (1 + nominal CAGR) ÷ (1 + inflation) − 1.
Purchasing power equivalent ≈ maturity ÷ (1 + inflation)^t.
Compound interest is the process where your investment earns interest on both the original principal and previously earned interest. Over time, this creates exponential growth, making it one of the most powerful concepts in finance.
• Interest is added to principal after each compounding period • Future interest is calculated on the increased amount • The longer the duration, the higher the growth • Frequency of compounding impacts total returns
Simple interest grows linearly, while compound interest grows exponentially. This means investments with compounding generate significantly higher returns over time compared to simple interest.
Time is the most important factor in compounding. Even small investments can grow into large amounts if given enough time due to the compounding effect.
The more frequently interest is compounded (monthly vs yearly), the higher your total returns, holding other inputs constant. This calculator lets you compare annual, semi-annual, quarterly, and monthly compounding.
By investing a fixed amount monthly, you can benefit from compounding and rupee-cost averaging. SIP helps build wealth consistently over time.
Inflation reduces the purchasing power of money. Use the optional inflation field to see a rough purchasing-power equivalent and real annualized return—helpful for retirement and long-term planning.
• Lump sum + optional monthly SIP • Compounding frequency selector • Year-by-year balance schedule • Nominal vs inflation-adjusted CAGR (illustrative) • Growth chart from yearly closing balances
• Fixed deposit (FD) and recurring deposit planning • Mutual fund and SIP forecasting • Retirement and education corpus estimates • Comparing monthly vs yearly compounding
• Ignoring inflation for long horizons • Expecting CAGR to equal the stated annual rate • Forgetting fees, taxes, and market risk in real portfolios • Using very short horizons to judge compounding
• Start early and stay consistent • Increase SIPs gradually with income • Revisit assumptions yearly • Keep an emergency fund so you don’t break compounding
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