The Calculator Helper

Blood Pressure Category

See which category a blood-pressure reading falls into.

mmHg
mmHg
Category
—
Reading
—
Pulse pressure
—
Mean arterial (MAP)
—
Guideline
ACC/AHA

Informational only and not a diagnosis. Single readings vary; diagnosis needs several over time. Discuss your numbers with a healthcare professional, and seek urgent care for very high readings (around 180/120+) or worrying symptoms.

Reading the categories

Blood pressure is written as systolic over diastolic, in millimetres of mercury (mmHg). The categories below describe where a reading sits; the more severe of the two numbers decides the overall category.

Normalunder 120 and under 80
Elevated120–129 and under 80
Stage 1130–139 or 80–89
Stage 2140+ or 90+
Crisisover 180 or over 120

These are general categories, not a diagnosis. They are a way to understand a number you have measured, not a substitute for professional assessment.

Worked example

A reading of 118/76 falls in the Normal range. 130/85 would be Stage 1 hypertension — the higher of the two numbers’ categories is the one that applies.

Measuring well

Readings drift with the moment — a rushed arrival, a coffee, a full bladder or a stressful day can all nudge them up. Sitting quietly for a few minutes, feet flat and arm supported, gives a fairer number, and an average of several is more telling than any single one.

Good to keep in mind

  • One number isn’t the whole story. Trends over time matter more than a single reading.
  • Technique counts. Rest first; don’t talk; use the right cuff size.
  • Ask a professional. Bring your readings to a clinician for interpretation.

This is general information, not medical advice.

Frequently asked questions

What do the two numbers mean?
The top number (systolic) is the pressure as the heart beats; the bottom number (diastolic) is the pressure between beats. Both matter, and the more severe category is the one used.
Which guidelines are these?
They follow the widely used ACC/AHA categories. Some countries and organisations use slightly different thresholds, so check the guidance that applies where you are.
Is one reading enough to know?
No. Blood pressure varies through the day and with stress, caffeine and activity. A diagnosis relies on several readings over time, often including measurements at home.
What should I do about a high reading?
Speak with a healthcare professional. A very high reading (around 180/120 or above), especially with symptoms like chest pain or breathlessness, needs urgent medical attention.