Free Compound Interest Calculator
See how money grows when interest compounds. Add a starting amount and a monthly contribution, set an expected return and a timeline, and watch the final value, total invested, and interest earned update instantly.
Final value
₹26,30,426
You invested
₹13,00,000
Interest earned
₹13,30,426
Assumes monthly compounding. Estimates only - not investment advice.
The short answer
Compound interest is interest earned on both your original amount and the interest already added. With a starting amount P, monthly contribution M, monthly rate r, and n months, the final value is P·(1+r)ⁿ + M·(((1+r)ⁿ−1)÷r). For example, ₹1,00,000 plus ₹10,000/month at 12% for 10 years grows to about ₹24.2 lakh - of which roughly ₹11 lakh is interest.
Want a year-by-year breakdown you can save offline? The full Compound Interest Calculator you own forever includes it.
Compound Interest Calculator · ₹499 · yours forever, works offline.
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Frequently asked questions
What is compound interest?+
Interest calculated on your original amount plus all the interest already accumulated - so your money grows faster over time. This calculator compounds monthly.
Can I model a SIP with this?+
Yes. Set the initial amount to your lump sum (or 0), and the monthly addition to your SIP amount, to project how a systematic investment grows.
Is this investment advice?+
No - it's a math tool for projections. Returns aren't guaranteed; use realistic rates and talk to a financial advisor for decisions.