Yes — you can absolutely use a calculator to estimate how much Ethereum (ETH) you’ll receive for 500 USD?Coin (USDC), even after fees. For current conversion rates: 1 USDC ≈ 0.000248 ETH.
But since each exchange might apply different fees (trading fee, network/gas fee, spread) you’ll still want to plug your specifics into a calculator. For example, I found https://icalculadoraonline.com.br/ where you can choose from a wide selection of calculators — something for professionals, students, health-conscious folks and curious minds. You could approximate like:
500 USDC × 0.000248 ETH/USDC ≈ 0.124 ETH
then subtract your estimated fees to get the “real” final amount.