How to calculate difficulty increases

[feofhweufheuiwhfef]

I am looking into Bitcoin mining, and want to ask if I have done my Math correctly.

Bitcoin mining difficulty increases by 20% every 2 weeks.

Let's say, I make 1 BTC over a 52 week period, without taking difficulty into account.

In order to take difficulty into account, is the following correct....??

1. Take 1 BTC, divide by 26 = 0.0384615384615385 BTC every 2 weeks

2. Take 0.0384615384615385 ... and multiply by 0.8, to take into account the 20% decrease.

So....

1st 26th = 0.0384615384615385
2nd 26th = 1st 26th * 0.8
3rd 26th = 2nd 26th * 0.8

and keep going until

26th 26th = 25th 26th * 0.8

Is this the right way to do it??

[DrG]

You're extrapolating backwards for lack of a better word.

calculate how much you make at current difficulty
The next difficulty you will make about 0.8x that
the one after you will make 0.8x the one above and so on

it's exponential decay, at least for the rest of the year most likely.  After 4 months the earnings will be trivial to waste time monitoring it.

Start it, enjoy the light show and the fun stats, promote BTC