No, 112 is not too low for blood pressure. In fact, it is considered to be within the normal range. Blood pressure is a measure of the force that your heart pumps blood through your body. The systolic number (the top number) measures the force when your heart contracts and pump blood out. The diastolic number (the bottom number) measures the force when your heart relaxes between beats and fills back up with blood. A normal blood pressure reading should fall below 120/80 mmHg.