In one sentence
Two ways of expressing an annual return or cost: APR is the simple rate without reinvestment, while APY factors in compound interest, so two products with the same number can pay differently.
APR and APY both express annual returns (or costs), with one decisive difference: APR is the simple rate, without reinvestment; APY factors in compound interest. Two products with the same number can pay differently, and the acronym tells you which.
Both acronyms show up in loans, savings accounts, and, with particular enthusiasm, in crypto yield products. APR is annual percentage rate: what you’d earn (or pay) in a year if interest isn’t reinvested. APY is annual percentage yield: the real result if every interest payment gets added to the principal and starts generating its own. At low rates the difference is cosmetic; at high rates with frequent compounding, it’s real money.
The difference between APY and APR, with numbers
The conversion is mechanical: APY = (1 + APR/n)^n − 1, where n is how many times a year it compounds. A 12% APR compounded monthly equals a 12.68% APY; compounded daily, 12.75%. Seems small? Raise the rate and the gap explodes. A 50% APR with daily compounding is a 64.8% APY. In the rate range DeFi advertises, confusing the acronyms can mean getting the math wrong by a fifth.
Same “12%,” different result
Two platforms advertise “12% annual” on $100,000 pesos. The first pays APR with no reinvestment: after a year you have 112,000. The second pays with daily compounding (an effective APY of 12.75%): you end up with 112,750. Same marketing, 750 pesos of difference in a year. Now flip the comparison: one advertises 12% APR and another 12% APY. The first one, if it compounds, actually yields more. The small acronym next to the big number is what decides.
Where APR shows up, where APY shows up, and why marketing picks one
For loans, regulatory standards usually require disclosing the annualized cost rate, because the bigger number protects the consumer by showing the real cost. For yield products, it’s the opposite. The bigger number sells better, so platforms tend to advertise APY, especially when frequent compounding inflates it. It’s neither illegal nor necessarily misleading; it’s a reason to read the acronym before the number.
The fine print of crypto yields
In DeFi and staking products, ask three questions before letting the number seduce you. First: is it APR or APY, and how often does it actually compound? (some protocols publish theoretical APYs that would require manually reinvesting every day, gas fees included). Second: what’s it paid in? An 80% APY paid in a token that loses 90% of its value in a year is a loss disguised as a party. Third: where does the yield come from? If the answer isn’t clear (real fees, protocol emissions, temporary subsidy), the high rate isn’t an opportunity: it’s the price of a risk you’re not seeing. Sustainable three-digit yields are unicorns; unsustainable ones are plentiful and have a track record.
How to compare APY and APR across products, step by step
The procedure that avoids almost every trap: first, convert both to effective APY using the same compounding frequency (or use a calculator, there are dozens). Second, check what asset the yield is paid in and what happened to that asset over the last year: a 30% rate on a token that dropped 70% is a 61% loss with good marketing. Third, identify the source of the yield (real fees, emissions, subsidy) and how long it will last. Fourth, subtract the costs: entry and exit fees, gas, early-withdrawal penalties. Whatever survives those four steps can be honestly compared.
