Costs by Dollar Value. The costs to replace an employee vary by their earning level, so training costs also vary. The Sasha Corporation averaged the results of 15 studies that determined average costs to replace an $8 per hour employee, determining an average cost of $9,444.47 per turnover. Even when the 33 percent of estimates with the highest prices were removed from calculations, replacement costs were $5,505.80 per turnover.