Build a cost average and pnl calculator for trading around core.show average, position size, usd and percentage amount PNL in a line and a small window box

 i am looking for a price average calculator --- i trade around cores a lot - mostly equities and crypto.   i go into trades with multiple ladders and out with multiple orders too. I always need to know the real average price of my position .      after i have m y position with maybe 5-7 orders in to it , then after a partial target was hit or a  partial stop was hit or a partial was added back . I always need to be able to quickly see my : average price ( as a level) ideally with a box attached to the line that has : the average price/ the percentage gain or  loss / in usd or (pips) i don´t trade FX so i think always in usd.    

  do you have such a tool or could you build such a tool? Do you know the FTX exchange - they stole all clients   money but the interface was great and had this exact calculation. 

build a cost average and pnl calculator for trading around core.show average, position size, usd and percentage amount PNL in a line and a small window box 

thank you