Calculating Common Real Estate Commissions Step 1 Multiply the commission percentage by the purchase price to find out your total commission. To estimate commission, simply multiply the percentage by the purchase price of the property. Remember, to convert percentage to decimal first by dividing it by 100. Rate: 5.5%; Purchase Price: $200,000 → .055 x 200,000 = $11,000 Rate: 4.75%; Purchase Price: $325,000 → .0475 x 325,000 = $15,437.50 Rate:.. Read More