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Blood Pressure Calculator (WHO Categories)

Check your systolic and diastolic blood pressure reading against standard WHO and AHA classification categories.

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Blood Pressure Checker & Log
Check your BP reading against WHO categories and track trends
Disclaimer: This tool is for informational purposes only. Always consult a doctor for medical advice regarding blood pressure management.
Enter your BP reading to check

Medical disclaimer. This calculator is provided for educational and informational purposes only and does not constitute medical advice, diagnosis, or treatment. Always consult a qualified healthcare professional regarding your health, diet, exercise, or medication decisions. Read full disclaimer →

About Blood Pressure Analyser

Blood pressure is recorded as systolic (pressure when heart beats) over diastolic (pressure between beats) in mmHg. WHO/AHA classification: Normal below 120/80; Elevated 120-129 and below 80; Stage 1 Hypertension 130-139 or 80-89; Stage 2 Hypertension 140+ or 90+; Hypertensive Crisis above 180 or above 120. Hypotension is typically below 90/60 mmHg.

Measurement accuracy tips: sit quietly for 5 minutes before measuring; keep the cuff at heart level; avoid caffeine, exercise, or smoking 30 minutes before; take readings on the same arm at the same time each day. White coat hypertension affects approximately 20% of people - home monitoring is more reliable for diagnosis. Lifestyle factors that significantly reduce BP: weight loss (1 mmHg per kg), regular aerobic exercise, reducing sodium intake, DASH diet, and limiting alcohol. Always consult a doctor before interpreting BP readings for medical decisions.

Frequently Asked Questions

Blood pressure is recorded as systolic over diastolic, in mmHg. Systolic (the top/first number) is the pressure in your arteries when your heart beats and pushes blood out. Diastolic (the bottom/second number) is the pressure between beats, when the heart is at rest and refilling.
Normal is below 120/80 mmHg. Elevated is 120-129 systolic with diastolic still below 80. Stage 1 Hypertension is 130-139 systolic or 80-89 diastolic. Stage 2 Hypertension is 140+ systolic or 90+ diastolic. A reading above 180 systolic or above 120 diastolic is a Hypertensive Crisis requiring immediate medical attention. Hypotension (low blood pressure) is typically defined as below 90/60 mmHg.
Sit quietly for about 5 minutes before measuring, keep the cuff at heart level, and avoid caffeine, exercise, or smoking in the 30 minutes beforehand. Take readings on the same arm at the same time each day for consistent tracking. White coat hypertension (elevated readings only in clinical settings) affects roughly 20% of people, which is why home monitoring is often considered more reliable for ongoing assessment.
Evidence-based approaches with meaningful impact include weight loss (roughly 1 mmHg reduction per kilogram lost), regular aerobic exercise, reducing sodium intake, following a DASH-style diet, and limiting alcohol consumption. This tool is for informational purposes only - always consult a doctor before making decisions about blood pressure management or medication.
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