What is compound interest?

Compound interest means you earn interest on your interest, not just on the principal. Over time this snowballs — a key reason long-term investing is powerful.

How does compounding frequency affect growth?

More frequent compounding (monthly vs. annually) produces slightly more growth. The difference becomes meaningful over longer time horizons.

Does this account for regular contributions?

No — this calculator handles a single lump-sum principal. For regular contributions, the SIP / DCA approach requires a separate calculation.

Compound Interest Calculator

Calculate how your savings or investment grows with compound interest. See the year-by-year balance breakdown instantly in your browser.

How to use

1
Enter your principal
Enter the starting amount you're investing or saving.
2
Set rate and term
Enter the annual interest rate, number of years, and how often interest compounds.
3
See your growth
The final balance and total interest appear instantly. Toggle the table to see each year.

Why use this tool?

Shows the exact power of compounding with a year-by-year breakdown
Supports annual, semi-annual, quarterly, monthly, and daily compounding
Runs entirely in your browser — no server, no data sent
Useful for savings accounts, bonds, CDs, and investment projections

Frequently asked questions

What is compound interest?: Compound interest means you earn interest on your interest, not just on the principal. Over time this snowballs — a key reason long-term investing is powerful.
How does compounding frequency affect growth?: More frequent compounding (monthly vs. annually) produces slightly more growth. The difference becomes meaningful over longer time horizons.
Does this account for regular contributions?: No — this calculator handles a single lump-sum principal. For regular contributions, the SIP / DCA approach requires a separate calculation.

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