Monero is special. The emission curve makes sure that each new block have less blockreward. No mining calculator is considering this. If you use them, they lead you to wrong expectations.
This calculator uses the following formula:Blockreward = (2^64 - 1 - current_supply * 10^12) * 2^-19 * 10^-12Daily income estimate = (H/s * Blockreward * 720) / NetworkHashrate
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