if your not confirm with calculation

i will do it for you and get 1 BTC

i love math

like the other 2 replys i use this side

http://www.alloscomp.com/bitcoin/calculator.phpbut with 2 exeptions:

**1. i take a BTC -> USD exchange rate of 13 $ (so your on the save side if the price may fall **

2. i will take a Difficulty increas of 20% ea 2 Weeks

(i know its a lit high but why not to be on the save side)

if you start friday you get 1 week on this diffikulty the calc says

1. Week: per Week ฿21.98 $285.68

so the difficulty will increas to: 680000

so you get per week

2.3. Week: per Week ฿18.31 $238.07

and again the increase to: 816000

3.4. Week: per Week ฿15.26 $198.39

5.6. Week: per Week ฿12.72 $165.32

7.8. Week: per Week ฿10.60 $137.77

**after 8 weeks rufly 2 month you get: 1461 $**so this is the time if something goes wronk like the Dificulty is increasing 20% each 2 Weeks and the price per BTC is droping to 13 $

so if you assume that the next

** 4 weeks** the price for 1 BTC is constant

**18$** you will get

**1648$** and got something for energy consumtion.

hope it helped if you didnt understand everything you can ask me (via pm or here)

hope it helped

WhiteCrow