Blood Pressure Tool

Blood Pressure Checker – BioSenseReview

Diagnostic Tool

Blood Pressure Checker

Enter your systolic and diastolic blood pressure readings to see where they fall across two major guidelines: the 2025 AHA/ACC and the 2024 ESC. Both now treat 120 mmHg systolic as the upper boundary of truly optimal blood pressure, but they classify the ranges above that point differently. For an accurate resting measurement, sit quietly for five minutes and use a validated upper-arm cuff device.

Systolic
/
Diastolic
mmHg

Use the higher reading if you measured both arms. Wrist devices and smartwatch estimates are not recommended for clinical interpretation.

Your Result

LowOptimalElevatedStage 1Stage 2Crisis

2025 AHA/ACC and 2024 ESC Classification

What the Categories Mean

Both the 2025 AHA/ACC and 2024 ESC guidelines agree that below 120 mmHg systolic is the only truly optimal range. Where they differ is what happens above that point. AHA 2025 considers 120-129 as Elevated and 130 as Stage 1 Hypertension. ESC 2024 still calls 120-129 Normal but classifies 130-139 as Elevated. The result is that the AHA draws the hypertension line 10 mmHg lower than ESC and NICE.

Low
< 90/60 mmHg
Below the accepted lower limit. Hypotension can cause dizziness and fainting. This tool cannot interpret readings in this range safely. Please consult a physician.
Optimal
< 120 / < 80 mmHg
Both AHA 2025 and ESC 2024 agree this is the ideal range. Associated with the lowest long-term cardiovascular risk. This is also the treatment target for most adults on blood pressure medication.
Normal (ESC) / Elevated (AHA)
120–129 / 70–79 mmHg
This is where the two guidelines diverge. ESC 2024 calls this range Normal. AHA 2025 classifies it as Elevated, meaning the guidelines do not agree. Neither recommends medication at this stage, but AHA flags it as a risk signal worth addressing through lifestyle changes.
Elevated (ESC) / Stage 1 HTN (AHA)
130–139 / 80–89 mmHg
AHA 2025 defines this as Stage 1 Hypertension, the same range ESC 2024 calls Elevated BP. Under AHA, medication may be recommended here depending on cardiovascular risk. Under ESC and NICE, this is not yet hypertension. Lifestyle changes are advised by all three guidelines.
Stage 2 HTN (AHA) / Grade 1 HTN (ESC/NICE)
140–159 / 90–99 mmHg
All three guidelines classify this as hypertension. AHA calls it Stage 2. ESC and NICE call it Grade 1. A single reading is not enough for a formal diagnosis; confirmed by ambulatory or repeated home measurements. Treatment decisions depend on overall cardiovascular risk.
Grade 2 Hypertension
160–179 / 100–109 mmHg
Moderate hypertension. Most guidelines recommend starting drug treatment at this level regardless of risk profile. Medical evaluation is needed.
Grade 3 / Hypertensive Crisis
≥ 180 / ≥ 110 mmHg
Severe hypertension. AHA calls readings above 180/120 a hypertensive crisis. NICE recommends urgent clinical assessment. If accompanied by symptoms, seek emergency care promptly.

Reference

AHA 2025 vs ESC 2024 vs NICE NG136

The three major guidelines classify the same numbers differently. This is the most important table on this page — the same reading can mean different things depending on which guideline your doctor follows.

Systolic / Diastolic AHA 2025 ESC 2024 NICE NG136 (UK)
< 120 / < 80NormalOptimalOptimal
120–129 / < 80ElevatedNormalNormal
130–139 / 80–89Stage 1 HTNElevated BPNormal / High Normal
140–159 / 90–99Stage 2 HTNGrade 1 HTNStage 1 HTN
160–179 / 100–109Stage 2 HTNGrade 2 HTNStage 2 HTN
≥ 180 / ≥ 110Hypertensive CrisisGrade 3 HTNSevere HTN

AHA/ACC 2025 Guideline (CIR.0000000000001356). ESC 2024 Guidelines for Arterial Hypertension. NICE NG136, last updated November 2023. The most important divergence is at 130 mmHg systolic: AHA classifies this as hypertension, ESC and NICE do not. If you are in the UK, your GP will typically follow NICE thresholds for treatment decisions.

Context

Factors That Affect Blood Pressure Readings

A single home reading is rarely enough to characterise your blood pressure. The following factors can significantly affect what your device shows.

White Coat Effect
Blood pressure measured in a clinical setting is often higher than at home. NICE defines white coat hypertension as a difference of more than 20/10 mmHg between clinic and ambulatory readings. This is one reason home monitoring is clinically valuable.
Measurement Method
Validated upper-arm cuff devices are the standard. Wrist devices give less consistent results and smartwatch cuffless estimates are not considered clinically reliable at this time. Arm position and cuff size both affect accuracy significantly.
Time of Day and Activity
Blood pressure follows a circadian pattern, typically lowest at night and higher in the morning. Exercise, caffeine, a full bladder, and emotional stress can all raise a reading temporarily. Measurements should always be taken after five minutes of quiet rest.
Both Arms
NICE recommends measuring blood pressure in both arms at initial diagnosis. A persistent difference of more than 15 mmHg between arms is clinically significant and can indicate vascular disease. Subsequent measurements should be taken from the arm with the higher reading.

Device Accuracy

Can Wearables Measure Blood Pressure?

This is one of the most actively marketed and most frequently misunderstood features in consumer wearables. No cuffless wearable currently on the market has been validated to clinical standards for blood pressure measurement. The physics behind cuffless estimation, which typically involves pulse transit time or photoplethysmography, does not yet produce accuracy comparable to a validated cuff device.

The Apple Watch Series 10 introduced a Hypertension Notification Feature in certain regions. This is a screening tool designed to flag possible undiagnosed hypertension, not a measurement device. A positive notification requires confirmation with a validated cuff. It is not intended for monitoring known hypertension.

A 2025 review published in Hypertension Research concluded that no cuffless BP technology currently provides convincing evidence of adequate accuracy for clinical use. Smartwatch-type devices with actual inflatable cuffs are a more promising category, but more research is needed before they can replace conventional ambulatory monitoring.

This tool is for informational and educational purposes only and does not constitute medical advice, diagnosis, or treatment. Blood pressure categories are shown according to both the 2025 AHA/ACC Guideline and the 2024 ESC Guidelines for Arterial Hypertension. These two guidelines do not fully agree on how to classify readings between 120 and 139 mmHg systolic. If you are in the UK, your GP will typically use NICE NG136 thresholds for treatment decisions. A single reading from a home device is not sufficient to diagnose hypertension. If you are concerned about your blood pressure, or if you are consistently seeing readings in the elevated or hypertensive ranges, please consult a qualified healthcare professional.

This reading is below the accepted lower limit. Low blood pressure can cause dizziness, lightheadedness, or fainting, particularly when standing up. There are many possible causes, from dehydration to medication effects. This tool cannot safely interpret readings in this range. If you are experiencing symptoms or if this is a consistent pattern, please speak with a physician. Both AHA 2025 and ESC 2024 agree this is the ideal range. It is associated with the lowest long-term cardiovascular risk and is the treatment target for most adults on blood pressure medication. If you are not on medication, a consistent reading here reflects good cardiovascular health. Continue current lifestyle habits and monitor periodically. Under AHA 2025, any systolic reading at or above 120 mmHg is no longer considered fully normal. This range is classified as Elevated, the first stage above optimal. No medication is recommended here, but AHA 2025 treats this as a clear signal to act on lifestyle: physical activity, salt reduction, limiting alcohol, and weight management. ESC 2024 still labels this range as Normal, so you may see different language depending on which guideline your doctor uses. If readings here are consistent and you have other cardiovascular risk factors, a conversation with your doctor is worthwhile. AHA 2025 classifies this as Stage 1 Hypertension. This is the most debated range across guidelines: ESC 2024 calls it Elevated Blood Pressure and NICE does not yet treat it as hypertension. Under AHA guidance, medication may be recommended at this stage depending on your 10-year cardiovascular risk score. Regardless of the label, all three guidelines agree lifestyle changes are the first response here. If you have diabetes, kidney disease, or existing cardiovascular disease, medical review is advisable even without symptoms. All three guidelines classify this as hypertension. AHA calls it Stage 2, ESC calls it Grade 1. A single reading is not enough to confirm a formal diagnosis. NICE recommends confirming with ambulatory monitoring or repeated home readings before starting treatment. At this level, medication is typically considered alongside lifestyle changes, with the decision based on your overall cardiovascular risk profile. Please discuss this with your GP or a healthcare professional. This is moderate to severe hypertension. All major guidelines recommend drug treatment at this level regardless of cardiovascular risk score. Sustained readings here carry significant long-term risk for stroke, heart attack, and kidney damage. Please do not ignore this result. If you are not already under medical care for blood pressure, make an appointment with your GP promptly. If you are on medication and still seeing readings in this range, a review of your current treatment is needed. This is a very high reading. AHA 2025 calls readings above 180/120 a hypertensive crisis. NICE recommends urgent clinical assessment at this level. If you are experiencing symptoms alongside this reading such as severe headache, chest pain, shortness of breath, visual disturbances, or confusion, seek emergency care now. If you feel well, sit quietly, wait five minutes, and repeat the measurement. If the reading remains this high, contact your GP or go to an urgent care clinic today. Do not wait.
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