1. The Heikin-Ashi Close is simply an average of the open,  
 
high, low and close for the current period.  
 

 
 HA-Close = (Open(0) + High(0) + Low(0) + Close(0)) / 4   
 

 
2. The Heikin-Ashi Open is the average of the prior Heikin-Ashi  
 
candlestick open plus the close of the prior Heikin-Ashi candlestick.  
 

 
 HA-Open = (HA-Open(-1) + HA-Close(-1)) / 2    
 

 
3. The Heikin-Ashi High is the maximum of three data points:  
 
the current period's high, the current Heikin-Ashi  
 
candlestick open or the current Heikin-Ashi candlestick close.  
 

 
 HA-High = Maximum of the High(0), HA-Open(0) or HA-Close(0)    
 

 
4. The Heikin-Ashi low is the minimum of three data points:  
 
the current period's low, the current Heikin-Ashi  
 
candlestick open or the current Heikin-Ashi candlestick close. 
 

 
 HA-Low = Minimum of the Low(0), HA-Open(0) or HA-Close(0)    
 

   ref:     http://stockcharts.com/school/doku.php?id=cha...eikin_ashi 
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