Your reading
120/80 mmHg
Healthy
- Low < 90 / < 60
- Healthy < 130 / < 85
- Slightly raised 130–139 / 85–89
- High (stage 1) 140–159 / 90–99
- High (stage 2) 160–180 / 100–120
- Severe (stage 3) > 180 / > 120
Blood pressure basics
- The two numbers: systolic measures pressure when the heart beats; diastolic measures pressure between beats. Both are measured in mmHg.
- Readings vary: blood pressure changes throughout the day. A single reading does not establish a diagnosis, and high blood pressure often has no symptoms.
- Low blood pressure: a systolic reading below 90 or a diastolic reading below 60 mmHg. It can occur without symptoms or be associated with dizziness or fainting.
NHS information: High blood pressure · low blood pressure · PoTS.
Based on UK ranges (NICE, NHS, British Heart Foundation), in line with European guidelines. Informational only, not medical advice or a diagnosis.