Is it safe to use the Compound Interest online?

Yes — and ours is safer than most. Many free online tools quietly upload your files to their servers to do the work. We don't. Everything happens inside your browser on your own device, so your files never reach the internet. There's no upload step, no server copy, and no way for us (or anyone else) to see what you're working on.

Are my files uploaded to a server?

No. There's no server-side processing here. The whole tool is a tiny app that runs in your browser — we don't even have a server that could receive your files. You can confirm this by opening your browser's network tab while you use the tool: nothing leaves your device.

Do I need to sign up or pay?

No. There's no account, no email collection, no credit card. The tool is free to use as much as you want, on as many files as you want. We're supported by a few unobtrusive ads on the page — not by your data.

Compound vs simple interest?

Simple: interest only on principal. Compound: interest on (principal + accumulated interest). Compound grows much faster — the famous 'eighth wonder of the world'.

Why does monthly compounding give more than yearly at the same rate?

Each compounding period adds interest sooner. At 12%/yr, monthly compounding effectively yields ~12.68% (the EAR).

Does it support SIP step-up?

Yes — you can set an annual increase percentage to model salary-linked SIP growth.

Compound Interest Calculator

See what your money will grow to. Plug in principal, interest rate, time, and (optionally) monthly contributions — get future value, total contributed, and total interest earned. Inflation-adjust for real-terms growth.

Features

Principal + monthly SIP contributions
Compounding frequency: yearly, half-yearly, quarterly, monthly, daily
Real-terms (inflation-adjusted) value
Year-by-year balance table
Visual growth chart (principal vs interest)
Save and share — URL encodes all parameters

How to compound interest calculator

Enter principal — Initial lump sum.
Add monthly contribution (optional) — For SIP / DRIP-style investing.
Set rate and tenure — Annual rate, years to grow.
Read the result — Future value, total interest, growth chart.

Frequently asked questions

Is it safe to use the Compound Interest online?: Yes — and ours is safer than most. Many free online tools quietly upload your files to their servers to do the work. We don't. Everything happens inside your browser on your own device, so your files never reach the internet. There's no upload step, no server copy, and no way for us (or anyone else) to see what you're working on.
Are my files uploaded to a server?: No. There's no server-side processing here. The whole tool is a tiny app that runs in your browser — we don't even have a server that could receive your files. You can confirm this by opening your browser's network tab while you use the tool: nothing leaves your device.
Do I need to sign up or pay?: No. There's no account, no email collection, no credit card. The tool is free to use as much as you want, on as many files as you want. We're supported by a few unobtrusive ads on the page — not by your data.
Compound vs simple interest?: Simple: interest only on principal. Compound: interest on (principal + accumulated interest). Compound grows much faster — the famous 'eighth wonder of the world'.
Why does monthly compounding give more than yearly at the same rate?: Each compounding period adds interest sooner. At 12%/yr, monthly compounding effectively yields ~12.68% (the EAR).
Does it support SIP step-up?: Yes — you can set an annual increase percentage to model salary-linked SIP growth.