Compound Interest Online - Free Browser Tool

Principal

Annual rate (%)

Years

Compounding

Future value

22,196.4

Interest earned

12,196.4

Tip: use samples, upload, copy, download, and send-to actions inside the workspace where available.

What is Compound Interest?

Compound Interest is a free, browser-based tool that helps you get the job done quickly. Project growth with compound interest. It's built for speed and privacy: Everything runs locally in your browser — your data is never uploaded to a server. No sign-up, no installs, and no daily limits.

How to use Compound Interest

1Enter your starting principal and the annual interest rate.
2Set the number of years and how often interest compounds (monthly, quarterly, yearly, etc.).
3See the future value and the total interest earned.

Features

Fast, focused, and easy to use
100% client-side — no upload, fully private
Free with no account, no watermark, and no daily limit
Works on large inputs, limited only by your device's memory
Load a sample, then copy, download, or share your result

Common uses

Quick one-off data jobs without opening a heavy app
Preparing data before importing it elsewhere
Sharing a reproducible result with a teammate via a link

Frequently asked questions

What is compound interest?: Compound interest is interest earned on both your original principal and the interest already added. The formula used here is A = P(1 + r/n)^(nt).
How much does compounding frequency matter?: More frequent compounding (e.g. monthly vs yearly) slightly increases the final amount because interest is added — and starts earning — sooner. Toggle the frequency to compare.
Does this account for regular contributions?: This tool compounds a single lump sum. For recurring monthly deposits, use the Investment Calculator or SIP Calculator instead.

Frequently asked questions

What is compound interest?

Compound interest is interest earned on both your original principal and the interest already added. The formula used here is A = P(1 + r/n)^(nt).

How much does compounding frequency matter?

More frequent compounding (e.g. monthly vs yearly) slightly increases the final amount because interest is added — and starts earning — sooner. Toggle the frequency to compare.

Does this account for regular contributions?

This tool compounds a single lump sum. For recurring monthly deposits, use the Investment Calculator or SIP Calculator instead.