How to calculate Dash network hashrate

gistfile1.txt

You will need : 

Actual diff (find it here http://insight.dash.org/insight/status).
Expected number of block per day (576 : 1blk every 2.5min. 1440min / 2.5).
Real number of block found that day. 

Algo is : D*2**32/150, or also other term : BlkFound/BlkExpected*Diff*2**32/150.

With exemple as of data today : 

diff = 400250.1804901968. 
Block found today = 550
Block expected per day = 576 (constant). 

We have 1.1460409569489950030692352 × 10^13 = 11.46 TH.
Or just have the direct answer using getnetworkhashps RPC command.