Blood Pressure Calculator — BP Category
Free blood pressure calculator (AHA 2017). Enter systolic/diastolic BP, age and sex for category, percentile and pediatric ranges.
CalcVita. (2026). Blood Pressure Calculator — BP Category. CalcVita. Retrieved September 2, 2026, from https://calcvita.com/en/calculators/blood-pressure
How It Works
Enter your systolic pressure (top number), diastolic pressure (bottom number), age and sex. The calculator uses AHA 2017 guidelines for adults (≥18) and AAP 2017 simplified tables for children (1–17). Results include classification, estimated population percentile, mean arterial pressure, and pulse pressure.
Methodology & Classification
This calculator classifies blood pressure using the 2017 ACC/AHA High Blood Pressure Clinical Practice Guideline (Whelton PB et al., Hypertension 2018), which lowered the hypertension threshold from 140/90 to 130/80 mmHg. The thresholds are: Normal (<120 AND <80 mmHg), Elevated (120-129 AND <80), Stage 1 Hypertension (130-139 OR 80-89), Stage 2 Hypertension (>=140 OR >=90), and Hypertensive Crisis (>180 AND/OR >120). The European ESC/ESH 2023 Guidelines for the Management of Arterial Hypertension (Mancia G et al., J Hypertens 2023) use a similar framework with Grade 1 (140-159/90-99) and Grade 2 (>=160/>=100) categories. Mean Arterial Pressure (MAP) is calculated as: MAP = Diastolic + (Systolic - Diastolic) / 3.
AHA 2017 Adult Classification
Normal: <120/<80 mmHg | Elevated: 120–129/<80 | Stage 1: 130–139 or 80–89 | Stage 2: ≥140 or ≥90 | Crisis: >180 or >120. Diagnosis of hypertension requires readings confirmed on at least 2 separate occasions.
AAP 2017 Pediatric Classification
Normal: <90th percentile | Elevated: 90th–94th | Stage 1: ≥95th | Stage 2: ≥99th+5 or ≥140/90. Thresholds vary by age, sex, and height. This calculator uses simplified tables averaged across height percentiles.
Measure blood pressure after sitting quietly for 5 minutes with your back supported and feet flat on the floor.
Avoid caffeine, exercise, and smoking for at least 30 minutes before measuring blood pressure.
Take multiple readings (at least 2) on separate occasions to confirm a diagnosis.
Scientific Sources
- Whelton PK et al. 2017 ACC/AHA High Blood Pressure Clinical Practice Guideline. Hypertension. 2018;71(6):e13-e115. PMID 29133356
- Flynn JT et al. Clinical Practice Guideline for Screening and Management of High Blood Pressure in Children and Adolescents. Pediatrics. 2017;140(3):e20171904. PMID 28827377
- NCD Risk Factor Collaboration (NCD-RisC). Worldwide trends in hypertension prevalence and progress in treatment and control. Lancet. 2021;398(10304):957-980. PMID 34450083
- Mancia G et al. 2023 ESH Guidelines for the management of arterial hypertension. J Hypertens. 2023;41(12):1874-2071. PMID 37345492
Suggested article
Blood Pressure Guide: AHA 2017 Classification and Healthy Ranges
What does your blood pressure reading mean? Learn the AHA 2017 classification (Normal, Elevated, Stage 1 & 2 Hypertension, Hypertensive Crisis), how to measure correctly, and evidence-based lifestyle strategies to manage it.
Read the full article →Frequently asked questions
- What is normal blood pressure?
- According to the American Heart Association (AHA) 2017 guidelines, normal blood pressure is a systolic reading below 120 mmHg AND a diastolic reading below 80 mmHg (written as 120/80 mmHg). Blood pressure is measured in millimeters of mercury (mmHg). Normal BP indicates a healthy cardiovascular system with lower risks of heart disease and stroke.
- What is the difference between Stage 1 and Stage 2 hypertension?
- Stage 1 hypertension (AHA 2017) is defined as systolic BP 130–139 mmHg OR diastolic BP 80–89 mmHg. Stage 2 hypertension is defined as systolic BP ≥140 mmHg OR diastolic BP ≥90 mmHg. Stage 1 may be treated with lifestyle changes alone; Stage 2 typically requires medication in addition to lifestyle changes. Always consult a doctor for diagnosis and treatment.
- What is a hypertensive crisis?
- A hypertensive crisis occurs when systolic BP exceeds 180 mmHg and/or diastolic BP exceeds 120 mmHg. There are two types: hypertensive urgency (very high BP without organ damage) and hypertensive emergency (very high BP WITH signs of organ damage such as chest pain, shortness of breath, severe headache, or vision changes). A hypertensive emergency requires immediate emergency care.
- How is blood pressure measured in children?
- In children (ages 1–17), blood pressure classification differs from adults. The American Academy of Pediatrics (AAP) 2017 guidelines define thresholds based on the child's age, sex, and height percentile. Normal BP is below the 90th percentile for age/sex/height; Elevated BP is 90th–94th percentile; Stage 1 hypertension is 95th percentile or above; Stage 2 hypertension is 99th percentile + 5 mmHg or above. This calculator uses simplified average tables averaged across height percentiles.
- What do systolic and diastolic mean?
- Systolic blood pressure (the top number) is the pressure in your arteries when your heart beats and pumps blood. Diastolic blood pressure (the bottom number) is the pressure between heartbeats, when your heart is at rest. Both numbers are important: high systolic pressure indicates the heart is working too hard; high diastolic pressure signals persistent arterial tension.
- What is mean arterial pressure (MAP)?
- Mean arterial pressure (MAP) is the average blood pressure throughout the cardiac cycle. It is calculated as: MAP = Diastolic + (Pulse Pressure / 3), where Pulse Pressure = Systolic − Diastolic. A normal MAP is generally 70–100 mmHg. MAP is used by clinicians to assess perfusion of vital organs; a MAP below 60 mmHg is considered inadequate for organ perfusion.
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