Average Down Calculator Existing shares Existing average price (per share) New shares to buy New purchase price (per share) Currency (for display) USD ($) EUR (€) GBP (£) PKR (Rs) None Calculate Reset Tip: leave fields empty to treat them as zero. Mobile friendly. How To Use Average Down CalculatorEnter your existing shares and average price per share.Add the number of new shares you plan to buy and their purchase price.Choose your currency from the dropdown.Click Calculate to see your new average price and total cost.Click Reset to clear all fields and start again.