Calculating Placepot Costs When calculating the total cost of your overall Placepot bet, you simply multiply your chosen stake by the number of selections picked in six races: e.g. if you have two horses in each race and your stake is 20p, your total bet would be: 2 x 2 x 2 x 2 x 2 x 2 x 0.2 = £12.80 (64 bets x 20p).