Theoretical revenue is only a reference for miners.
Theoretical revenue is a result of a calculation that is based on network rewards and difficulty--it is a temporary value. If the volatility of a network’s difficulty is large or the speed of a network’s difficulty adjusts quickly (For example, ZEC, ZEN, XVG, etc.), the theoretical revenue of the coin changes more frequently. Therefore, there will be a significant difference if monetary values are used to estimate the mining revenue of an entire day.
The payment method is also an important factor to take into consideration. BTC and ETH apply the PPS+ payment method (including the basic PPS rewards and transaction fees). Theoretical revenue and actual mined revenue differ since transaction fees are unpredictable. Miner rewards that mining revenue calculators show refer to the past 8 hours of data. There will be significant differences if the total transaction fee amounts from the network change a lot.
Therefore, mining revenue amounts from the calculator can only be considered an estimate.