Blood Pressure Category Calculator — AHA/ACC Categories

How this calculator works

• Average: if you enter more than one reading, the systolic and diastolic values are averaged separately, as guidelines recommend basing decisions on 2 or more readings.
• Category: the higher of the systolic and diastolic categories, using the American Heart Association chart shown above (aligned with the 2025 AHA/ACC high blood pressure guideline).
• Pulse pressure = systolic − diastolic. Mean arterial pressure ≈ diastolic + (systolic − diastolic) ÷ 3.

By Suhaib Hassan · Reviewed 28 September 2026 against the AHA blood pressure chart · How CalculatePilot verifies formulas →

A worked example

Readings of 128/82, 132/84 and 126/80 average to 129/82 mm Hg. The systolic of 129 is "elevated", but the diastolic of 82 is in the 80–89 range, so the overall category is stage 1 hypertension. Pulse pressure is 47 mm Hg and mean arterial pressure about 98 mm Hg.

When to act

If a reading is higher than 180/120 mm Hg, the AHA advises waiting a minute and measuring again. If it's still that high and you have no symptoms, it's severe hypertension — call your healthcare professional. If you have symptoms such as chest pain, shortness of breath, back pain, numbness, weakness, vision changes or difficulty speaking, it may be a hypertensive emergency — call 911 (or your local emergency number).

These categories are for adults. Children and teens use age-based ranges, and blood pressure in pregnancy needs individual guidance from your care team. This calculator categorizes readings for awareness only — it is not a diagnosis. Blood pressure varies through the day with stress, caffeine, activity and technique, so a clinician looks at the pattern of readings over time. For home readings, sit quietly for 5 minutes with your back supported, feet flat and arm at heart level, and avoid caffeine, exercise and smoking for 30 minutes beforehand.

Sources

• American Heart Association — Understanding Blood Pressure Readings (reviewed August 2025)
• Jones DW, Ferdinand KC, Taler SJ, et al. 2025 AHA/ACC/AANP/AAPA/ABC/ACCP/ACPM/AGS/AMA/ASPC/NMA/PCNA/SGIM Guideline for the Prevention, Detection, Evaluation and Management of High Blood Pressure in Adults. Hypertension. 2025;152:e114–e218.
• American Heart Association — Monitoring Your Blood Pressure at Home

Blood pressure categories at a glance

Category	Systolic (top)	and / or	Diastolic (bottom)
Normal	Less than 120	and	Less than 80
Elevated	120–129	and	Less than 80
Stage 1 hypertension	130–139	or	80–89
Stage 2 hypertension	140 or higher	or	90 or higher
Severe hypertension (hypertensive crisis if symptoms)	Higher than 180	and/or	Higher than 120

The category follows whichever number falls in the higher band. Categories apply to adults at every age, and the cut-offs do not change as you get older.

Example readings and their categories

Reading (mm Hg)	Category	Why
118/76	Normal	Both numbers are in the lowest band
124/76	Elevated	Systolic 120–129 with diastolic under 80
124/82	Stage 1	Diastolic 80–89 outranks the systolic
136/78	Stage 1	Systolic 130–139
132/92	Stage 2	Diastolic 90 or higher outranks the systolic
142/84	Stage 2	Systolic 140 or higher
180/110	Stage 2	180 itself is not above 180
185/110	Severe	Systolic higher than 180

A reading like 120/80 lands in stage 1 because a diastolic of 80 is the start of the 80–89 band, even though the systolic alone would be elevated.

Pulse pressure and mean arterial pressure examples

Reading	Pulse pressure	Mean arterial pressure
118/76	42	90.0
136/78	58	97.3
142/84	58	103.3
185/110	75	135.0

Pulse pressure is systolic minus diastolic. Mean arterial pressure is estimated as diastolic plus one third of the pulse pressure. Both are extra context for your clinician; neither changes the category.

Common mistakes that skew a home reading

• Measuring straight after caffeine, exercise or smoking (wait 30 minutes).
• Not resting for 5 minutes with your back supported and feet flat.
• Crossed legs, a full bladder, or talking during the measurement.
• An arm resting below heart level, or a cuff over clothing.
• A cuff that is the wrong size for your arm.

Take two or more readings and enter them all. The calculator averages them for you. Readings below 90 systolic or 60 diastolic are flagged as low; low pressure mainly matters if it causes symptoms such as dizziness or fainting.

Frequently asked questions

Which number matters more, systolic or diastolic?expand_more

Both matter. Your category is set by whichever number falls in the higher band. After about age 50, systolic pressure becomes a stronger predictor of heart disease and stroke risk for most people.

Is one high reading a diagnosis of high blood pressure?expand_more

No. Diagnosis is based on the average of two or more readings taken on two or more occasions. A single high reading is worth rechecking, and repeated high readings are worth discussing with a clinician.

What is a normal blood pressure?expand_more

Under the AHA categories, normal is a systolic below 120 and a diastolic below 80 mm Hg.

Is 130/80 high blood pressure?expand_more

Under the AHA categories used here, yes: a systolic of 130 to 139 or a diastolic of 80 to 89 is stage 1 hypertension. One reading is not a diagnosis, so confirm it with repeated readings and a clinician.

What is the difference between elevated blood pressure and stage 1 hypertension?expand_more

Elevated means a systolic of 120 to 129 with a diastolic under 80. Stage 1 starts when the systolic reaches 130 or the diastolic reaches 80, whichever happens first.

What counts as a hypertensive crisis?expand_more

A reading higher than 180 systolic and/or higher than 120 diastolic. Wait a minute and measure again. If it is still that high, contact your healthcare professional right away, and call 911 or your local emergency number if you have chest pain, shortness of breath, numbness, weakness, vision changes or difficulty speaking.

Do the blood pressure categories change with age?expand_more

No. The AHA categories apply to adults of any age. Average readings tend to rise with age, but that does not move the category cut-offs. Children and teens use age-based ranges instead.

How do I calculate pulse pressure and mean arterial pressure?expand_more

Pulse pressure is systolic minus diastolic, so 118/76 gives 42. Mean arterial pressure is about diastolic plus one third of the pulse pressure, so 118/76 gives 76 + 14 = 90 mm Hg.