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Blood Pressure Calculator

Enter your blood pressure reading to find out which category it falls into, from normal to hypertensive crisis. This calculator uses internationally recognised categories and includes age-based reference ranges relevant to Australian adults.

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1

Enter your details

mmHg
mmHg
years

For age-specific context

Your Blood Pressure

Example

Example figures, not your own. Worked for a reading of 128/82 mmHg. Enter your own details and press Calculate.

Reading

128/82mmHg

Stage 1 Hypertension

Consult your GP. Lifestyle changes (weight loss, exercise, reduced salt) may be recommended. Medication may be needed based on overall risk.

For your age group (18-39): Typical normal range is around 110-120/70-80 mmHg.

How It Works

Blood pressure is measured as systolic (top number) over diastolic (bottom number) in mmHg. Categories are: Normal (below 120/80), Elevated (120-129 systolic with diastolic below 80), Stage 1 Hypertension (130-139/80-89), Stage 2 Hypertension (140+/90+), and Hypertensive Crisis (above 180/120). The calculator uses the higher category if systolic and diastolic fall into different ranges.

How to use it

  1. 1Enter your systolic blood pressure (top number) in mmHg
  2. 2Enter your diastolic blood pressure (bottom number) in mmHg
  3. 3Optionally enter your age for age-specific context
  4. 4Click "Calculate" to see your blood pressure category and risk level

Quick Reference

CategorySystolic (mmHg)Diastolic (mmHg)
Low (Hypotension)< 90< 60
Normal< 120< 80
Elevated120-129< 80
Stage 1 Hypertension130-13980-89
Stage 2 Hypertension140+90+
Hypertensive Crisis> 180> 120
---------
Age 18-39 typical110-12070-80
Age 40-59 typical115-13075-85
Age 60+ typical120-14070-80

Age-based ranges are averages. Individual targets may vary based on health conditions. Source: Heart Foundation Australia.

How This Is Calculated

BP Category = classify(systolic, diastolic)
systolic
= top number - pressure when heart contracts (mmHg)
diastolic
= bottom number - pressure between heartbeats (mmHg)

The higher category applies when systolic and diastolic fall in different ranges. A single reading does not diagnose hypertension - your GP will take multiple readings over time.

Frequently Asked Questions

What is a normal blood pressure reading?
A normal blood pressure for adults is below 120/80 mmHg. The first number (systolic) measures pressure when your heart beats, and the second (diastolic) measures pressure between beats. Readings should be taken at rest.
How often should I check my blood pressure?
The Heart Foundation recommends all Australian adults have their blood pressure checked at least every two years from age 18. If you have risk factors or a reading above 120/80, check more frequently, your GP can advise on the right interval.
Does weight loss lower blood pressure?
Yes. Losing even 5 kg can reduce blood pressure by 5-10 mmHg. The combination of weight loss, reduced sodium intake, regular exercise, and limiting alcohol is often as effective as medication for mild hypertension.
When should I see a doctor about my blood pressure?
See a GP if your reading is consistently above 140/90, or immediately if above 180/120 (hypertensive crisis). A single high reading does not mean you have hypertension, your doctor will want multiple readings over time.

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