The numbers you type never leave your device.
No account, no tracking of your finances, no black-box math. Here's exactly how CompoundInterestCalc.cc works — and why you can rely on it without handing over anything.
Private by design
Every calculation runs entirely in your own browser. Your income, balances and loan details are never sent to us, stored on a server, or shared with anyone.
No sign-up, ever
No email wall, no free trial, no "create an account to see your results." Open any tool and use it in full, instantly — free today and free tomorrow.
Transparent math
We don't hide the formula. Every calculator shows the equation it uses and a worked example, so you can check our working — or reproduce it yourself.
The questions people actually ask
What our numbers can and can't do
We think trust is built as much on what a tool won't claim as on what it does. So we say this clearly: our calculators produce illustrations, not predictions. They rely on simplifying assumptions — a steady rate of return, a fixed interest rate, no surprise fees — and the real world is bumpier than that.
Markets rise and fall. Lenders quote their own figures. Tax rules change. A result here is a well-built estimate to help you understand the shape of a decision, not a promise of what will happen. We'd rather be useful and honest than impressive and misleading.
How the site stays free
Keeping the tools free and open means the site is supported by advertising and, occasionally, affiliate links. These never change the price you pay, and the presence of an ad or link is not an endorsement. We spell out exactly how this works in our Terms of Service and Privacy Policy.
Found a mistake?
We build carefully, but errors can happen. If a number ever looks wrong, please tell us — we take corrections seriously and fix them fast. Accuracy you can check is the whole point.
Trust, but verify.
Open any calculator, read its formula, and run the numbers yourself. Nothing to sign, nothing to share.
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