How do you calculate mining yield manually when no online calculators are around

[GAML]

Hiiii

I was wondering.  I am finding that for new coins there seems to be a lack of mining calculators.  If we know the block reward, our hash rate and difficulty can anyone provide us with the mathematical equation for manually estimating mining yield.

Further more is there an equation for manually calculating what would come out of a mining pool based on shares, overall pool hash rate etc.

If anyone who is really good at maths could help I would really appreciate it.

Many thanks.

[Kluge]

You lot are spoiled. Back in my day, we pulled out a god-damned napkin... there are a bunch of ways to guesstimate it. This one apparently stuck in my head.

Rough expected reward (per day) = (your hash rate / network hash rate)*(144*25)*(1-%pool fee)

Ex: you have 500TH/s. Network has 20000TH/s. 5% pool fee.
(500/20000)*(144*25)*(1-.05)
(.025)*(3600)*(.95)

Expected return: 85.5BTC/day

Adjust for coin of your choice. You'd get a better immediate estimate by working with difficulty instead of network hashrate, but - eh.

[Kluge]

Hold on........

[GAML]

Thank you very much for helping a poor noob.  I am not very good at maths so I really appreciate you taking the time out to explain.  Good luck, many coin and much riches to you  

What would the formula be for difficulty?  I am attempting to calculate what I would get on Reddcoin