Compound interest calculator

See how your money grows over time — works in dollars, pounds, euros, or rupees.

Last reviewed: August 2026 · Figures are estimates for general planning only — see the explanation below for this calculator's specific assumptions.

Initial amount (choose currency below)

Currency

Annual interest rate

Number of years

Compounding frequency

Invested: $10,000 (46%)Interest: $11,589 (54%)

How this grows over time

if you invest $10,000 for 10 at 8%, compounded Annually, it grows to about $21,589 — $11,589 in compound interest earned along the way. See the equivalent using Indian Rupees and FD-specific terms instead

What is compound interest?

Compound interest means the interest you earn also starts earning its own interest, instead of just being calculated on your original amount every time. Over long periods this makes a real difference compared to simple interest, where only the original amount ever earns interest.

This does not convert between currencies

Choosing a currency only changes how the result is displayed — the symbol and the digit grouping — it does not apply any exchange rate. Entering 10,000 with dollars selected shows "$10,000"; the same 10,000 with rupees selected shows "₹10,000." The underlying number is identical either way, since compound interest math doesn’t care what currency it’s denominated in — only what you actually invest and what rate you actually earn.

How compounding frequency changes the result

More frequent compounding — daily beats monthly, monthly beats annually — grows your money slightly faster at the exact same stated interest rate, since each bit of interest starts earning its own interest sooner. The difference is usually modest at typical rates, but it grows with a higher rate and a longer time period.

Frequently asked questions

Does this calculator convert between currencies?

No — selecting a currency only changes how the number is displayed (its symbol and digit grouping), not the number itself. There is no exchange rate applied. If you want to know what $10,000 is worth in rupees today, you’ll need a separate currency converter — this tool only calculates growth over time within one currency.

What is the difference between compound interest and simple interest?

Simple interest is calculated only on your original amount, every time, so it grows in a straight line. Compound interest is calculated on your original amount plus all the interest you’ve already earned, so it grows faster and faster the longer you leave it — the gap between the two widens significantly over long periods.

Does compounding frequency make a big difference to my returns?

It’s a real but usually modest difference — daily compounding beats annual compounding at the same stated rate, but by a few percent over long periods, not a dramatic amount. It matters more at higher interest rates and over longer time horizons.

Common questions answered

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