Real DeFi APY Calculator
Calculate your true DeFi yield after subtracting inflation and platform fees from the headline APY. Helps you compare DeFi opportunities on a real purchasing-power basis rather than nominal rates.
About this calculator
Headline APY figures in DeFi protocols look attractive, but they overstate real returns because they ignore inflation and platform fees. The real APY formula used here is: Real APY = Nominal APY − Inflation Rate − Platform Fees (all in %). This is an approximation of the Fisher equation adapted for DeFi — the full Fisher formula is (1 + nominal) / (1 + inflation) − 1, but for rates below ~10% the linear subtraction is a close and practical estimate. Nominal APY is the gross yield advertised by the protocol. Inflation erodes purchasing power in fiat terms. Platform fees cover gas, management, and performance charges that reduce net tokens received. A 20% nominal APY with 6% inflation and 3% fees yields only 11% real return.
How to use
You find a liquidity pool offering 18% nominal APY. Current inflation is 4%, and the platform charges 2% in combined fees. Step 1 — Enter Nominal APY: 18. Step 2 — Enter Inflation Rate: 4. Step 3 — Enter Platform Fees: 2. Step 4 — The calculator computes: (18 − 4 − 2) = 12.00% real APY. That means your investment's real purchasing power grows at 12% annually, not 18%. Now test a competing pool at 14% APY with 1% fees: 14 − 4 − 1 = 9% real APY — lower nominal but potentially more attractive after fees than a high-APY pool with heavy charges.
Frequently asked questions
Why is real APY more important than nominal APY in DeFi investing?
Nominal APY tells you how many extra tokens you earn, but it says nothing about what those tokens can actually buy. If inflation runs at 6% and your nominal yield is 8%, your real purchasing power grows by only about 2%. In high-inflation environments, even double-digit DeFi yields can produce negligible real gains. Comparing real APY across protocols also strips out fee differences, giving you an apples-to-apples measure of which pool genuinely grows your wealth the fastest after all costs.
What DeFi platform fees should I include when calculating real APY?
Include every recurring cost that reduces your net yield: protocol management fees (often 0.5–2% annually on yield aggregators), performance fees charged as a percentage of profits (common in vaults), and any withdrawal or deposit fees expressed as an annual equivalent. Gas costs on Ethereum are one-time transaction costs rather than ongoing yields drains, so they matter more for small positions and short holding periods — factor them in separately by dividing total gas cost by position size. Ignore fees that are already netted out of the advertised APY, as some protocols quote net figures.
How does inflation rate affect my DeFi staking returns in real terms?
Inflation erodes the fiat purchasing power of your earnings. If you earn 15% APY in a stablecoin pegged to USD and USD inflation is 5%, your real return is approximately 10% — you can buy 10% more goods next year, not 15%. For yields paid in volatile crypto tokens, the situation is more complex: the token's own price change compounds with fiat inflation to determine real value. During high-inflation periods, allocating to yield-bearing stablecoin pools and then applying this calculator helps you identify protocols that genuinely outpace the cost of living.