Recently, while studying crypto staking and DeFi, I found that many people confuse the concepts of APR and APY. To be honest, I was the same at first because they look very similar, but in reality, the difference is quite significant.

Let's start with APR, which is the annual percentage rate, a very straightforward concept. Suppose you deposit $10,000, with an interest rate of 20% APR, then after one year, you earn $2,000 in interest, totaling $12,000. In the second year, the interest is still calculated on the original principal of $10,000, again earning $2,000, reaching $14,000. Simply put, APR is calculated based on the original principal, not considering the interest you've already earned.

APY is different. APY takes into account the effect of compounding. The same 20% APR, but if compounded monthly, the interest earned each month is added to your principal, so the next month's interest is calculated on the higher new principal. As a result, by the end of the year, you won't have $12,000 but about $12,194. If compounded daily, it would be even higher, around $12,213. The more frequently the interest is compounded, the more money you ultimately receive.

In other words, a 20% APR with monthly compounding is effectively about 21.94% APY; with daily compounding, it's approximately 22.13% APY. The interest rate itself doesn't change, but increasing the compounding frequency boosts your actual yield. That's why APY is almost always higher than APR.

In the crypto space, this difference becomes even more important. The APY you see on a staking platform or DeFi protocol might be calculated with daily or even higher frequency compounding, while another platform might advertise APR. Comparing these numbers directly can be misleading. The best approach is to convert them to the same conditions before comparing; otherwise, you might think you've found a better yield product, but in reality, you haven't.

There's also a detail to watch out for. In crypto, APY usually refers to the rewards in tokens you earn, not their fiat value. This is crucial because token prices fluctuate rapidly. You might receive tokens with a high APY, but if their market price crashes, your total asset value actually decreases. Even if the number of tokens increases, your overall value in fiat terms could drop. So, when choosing staking or lending products, don't just look at the APY number—understand the risks and details behind it.

To summarize: APR is the base interest rate, and APY reflects the actual yield after considering compounding. The higher the compounding frequency and the longer the time, the more the difference between the two becomes apparent. When evaluating crypto staking, lending, or other DeFi products, take the time to confirm whether the platform uses APR or APY, and convert them to the same conditions for comparison. That way, you can make smarter decisions.