LOL thanks but it would be easier to just spend $50 on a heater with a thermometer then trying to calculate things like humidity, airflow and all that mumbo jumbo.I suppose we could calculate it given enough information like heat input from your equipment, lighting, relative humidity, airflow effecting evaporation and cooling.
Realistically, it could be anywhere around 5 degrees F warmer or cooler.
I've found my tanks tend to be a few degrees warmer than the average room temperature. But room temps vary widely so the tank is a bit cooler during the day a bit warmer at night.
Also my 2 fish are pretty hardy.