According to Healthline, the blood pressure range for a hypertension crisis is a systolic number above 180 mm Hg and a diastolic number above 120 mm Hg. Immediate medical attention is required at that level. Healthy blood pressure is a reading of less than 120/80 mmHg, while elevated blood pressure ranges from a systolic number of 120-129 mm Hg and a diastolic number of less than 80 mmHg. Hypertension occurs starting at 130-139/80-89 mmHg. It's good to have an idea of where your blood pressure should fall. Hypertension doesn't result in visible symptoms right away, so it's important to detect and manage it early on.