See which category your blood pressure reading falls into.
Updated Sep 2026Fill in the fields and press Calculate. Every range comes from the sources listed under the tool.
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Sources
- High Blood Pressure - Diagnosis | NHLBI, NIH NIH National Heart, Lung, and Blood Institute
- Essential Hypertension - StatPearls - NCBI Bookshelf NIH National Library of Medicine (NCBI Bookshelf)
- High Blood Pressure | Hypertension | MedlinePlus MedlinePlus
- High Blood Pressure - What Is High Blood Pressure? | NHLBI, NIH NIH National Heart, Lung, and Blood Institute
Understanding Your Blood Pressure Reading
This blood pressure calculator places a reading in its category. A blood pressure reading has two numbers. Systolic, the top number, is the pressure in your arteries when your heart beats. Diastolic, the bottom number, is the pressure between beats. Both matter: a diagnosis of high blood pressure can come from either number being elevated, not just the top one.
This checker uses the American Heart Association categories, updated in 2017, which set the bar lower than the old 140/90 standard. Nearly half of American adults now fall into the high blood pressure range, and most of them do not feel a thing, which is exactly why checking matters.
- Low: under 90 or under 60
- Normal: under 120 and under 80
- Elevated: 120 to 129 and under 80
- High, stage 1: 130 to 139 or 80 to 89
- High, stage 2: 140 or higher or 90 or higher
- Crisis: above 180 or above 120
How to Take an Accurate Reading at Home
- Sit quietly for 5 minutes first, feet flat on the floor, back supported
- No caffeine, exercise, or smoking in the 30 minutes before
- Cuff on bare skin, arm resting at heart level
- Take two readings a minute apart and average them
- Measure at the same times each day; morning and evening is the usual advice
One high reading does not diagnose anything. Blood pressure swings with stress, sleep, coffee, and even a full bladder. What counts is the pattern across days. Pair this check with your waist to hip ratio and BMI for a fuller heart health picture; the page on what is a normal blood pressure puts the categories next to resting pulse, A1C and caffeine.
Frequently Asked Questions
What is a normal blood pressure?
Below 120 systolic and below 80 diastolic. Readings of 120 to 129 over less than 80 count as elevated, and 130/80 or higher is stage 1 high blood pressure under current AHA guidelines.
Which number matters more?
Both are used for diagnosis, but after age 50, systolic pressure is generally the stronger predictor of cardiovascular risk. Under 40, an isolated high diastolic still deserves attention.
Can I lower blood pressure without medication?
Often, yes, at least partly. Losing 5 percent of body weight, cutting sodium, 30 minutes of daily walking, limiting alcohol, and better sleep each shave off measurable points. Many people combine these with medication rather than replacing it; that decision belongs to your doctor.
When is blood pressure an emergency?
Above 180 systolic or 120 diastolic, recheck after a few minutes of rest. If it stays that high, or you have chest pain, shortness of breath, vision changes, or weakness, seek emergency care immediately.
Sources
- High Blood Pressure – Diagnosis | NHLBI, NIH · NIH National Heart, Lung, and Blood Institute
- Essential Hypertension – StatPearls – NCBI Bookshelf · NIH National Library of Medicine (NCBI Bookshelf)
- High Blood Pressure | Hypertension | MedlinePlus · MedlinePlus
- High Blood Pressure – What Is High Blood Pressure? | NHLBI, NIH · NIH National Heart, Lung, and Blood Institute
This tool categorizes readings for education only. It does not diagnose, and it is not a substitute for medical care. Concerning readings belong in front of a doctor.