Conclusion first: over short periods, simple and daily-compounding interest come out almost the same. What actually decides how much you get is the rate and the number of days, not the compounding method.

Most people's first reaction to an APY is "that looks decent", but converted into their amount over their number of days, the figure is often far from what they expected. That's what this tool does: turn a percentage into money you can picture.

How to use it, and how to read the numbers

What problem it solves

The platform shows an annual percentage; what you care about is "how much do I get for this amount over these days". There's a conversion in between, and the place that conversion goes wrong most often is the days: an APY refers to 365 days, so holding for 30 gets you a small fraction of it. Type it in and the answer appears, no mental arithmetic.

What goes in each of the three inputs

Principal is the amount you plan to deposit, in USDT. APY is whatever percentage the platform is showing you at the time. Note that some products list the base rate and a campaign bonus separately, so add the two before entering. Days is how long you plan to hold; for something like Flexible that you can exit anytime, enter your estimate of how long it will sit there.

The difference between simple and daily compounding

Simple means the interest is calculated and set aside and the principal doesn't change; daily compounding means each day's settled interest starts earning from the next day. Over short periods the two are nearly identical; the gap only shows with longer periods and higher rates. Flexible products usually settle daily and add to the balance, which is close to daily compounding; Locked products mostly settle once at maturity, closer to simple. Go by the terms of whatever product you subscribed to.

How the "annualised" figure is calculated

It takes the interest you actually received over the period and extrapolates it to a full-year rate over 365 days, using the same basis as the method you selected. With simple selected it extrapolates linearly, and the result equals the rate you entered. With daily compounding selected it extrapolates on a compound basis, and the result comes out a little above the rate you entered: 10,000 principal at 5% for 30 days shows 5.13% in this row, not 5.01%; the latter is the compounding flattened onto a simple basis, which wouldn't reconcile with the "equivalent over a full year" row below it.

This row exists for comparison: when one product settles daily and another settles at maturity, comparing their headline rates isn't fair, and putting them on the same basis is.

Where the data comes from

There is no data source. This page connects to no API and has no hard-coded rate table; every number is entered by you and computed in your own browser. The reason is simple: platform rates change daily, any copied number goes stale, and rather than give you a default that may already be wrong, we'd rather you typed in what you can see on the page in front of you.

What to think about after the calculation

The interest is only half the account. The other half is what you carried for it: whether you can exit anytime, how long the lock-up is, whether the principal can be converted into another coin. The same APY on Flexible and on Dual Investment sits on completely different risks. To see that layer clearly, read the tier-by-tier write-ups in Product Terms.

Who it's for

People new to stablecoin Earn who have no intuition for percentages, and people already depositing who want to compare two options quickly. It isn't suitable for forecasting returns; rates move, and today's number doesn't mean you'll capture it for the whole period.

What comes out is an estimate, not a promise. Floating rates change daily and the actual amount is whatever the platform settles. Earn products aren't principal-protected and the platform itself carries credit risk; a product with an unusually high APY usually means you're carrying a risk that isn't in the headline.

Once the numbers are clear, the next step is usually opening an account. The sign-up flow and where the invite code goes are in Binance sign-up and invite code.