There is really nothing to calculate on Solochance and the site is for nothing.

Reason: You can hit a block in an hour or in 500 years.
This is statistics, and easy to calculate:
average time to find a block @ 100% diff. in Seconds = Net difficulty * 2**32 / Miner hashrate per Second
That is all, it did not predict a time when
you will find a block.

und auf deutsch ginge das auch im childboard "Mining"