The percent yield is the actual yield divided by the theoretical yield. It is determined by dividing the experimental yield by the theoretical yield and multiplying by 100%. The percent yield is 100 percent if the actual and theoretical yields are equal. Because the actual yield is typically lower than the theoretical value, the percent yield is usually less than 100 per cent. Incomplete or competing responses, as well as sample loss during recovery, are possible causes. Percent yield might be higher than 100%, indicating that more samples were retrieved from a reaction than expected.