Blood Pressure Checker
Is Your BP Normal, High or Low?
Enter your blood pressure reading to instantly check your category and health risk. Get your personalised action plan, BP chart position, WhatsApp share card, and free PDF report. Based on American Heart Association guidelines.
What Is Blood Pressure?
High blood pressure (hypertension) is called the "silent killer" because it usually has no symptoms until serious damage has occurred to the heart, blood vessels, kidneys, or brain. It affects approximately 1.3 billion people worldwide and is the leading cause of preventable cardiovascular disease, stroke, kidney failure, and premature death. Regular monitoring is essential because most people with hypertension are unaware they have it.
Blood pressure naturally fluctuates throughout the day -- it is highest in the morning, lower in the afternoon, and lowest during sleep. Acute stress, exercise, caffeine, and anxiety can temporarily elevate readings. This is why a single high reading does not diagnose hypertension -- diagnosis requires sustained elevated readings on multiple occasions. Check your related cardiovascular markers with our Heart Rate Calculator and Cholesterol Checker.
What Is Normal Blood Pressure?
AHA Blood Pressure Categories -- Complete Guide
| Category | Systolic | Diastolic | Risk Level |
|---|---|---|---|
| Hypotension (Low BP) | Below 90 | Below 60 | Consult doctor if symptomatic |
| Normal | Less than 120 | Less than 80 | Minimal -- maintain healthy habits |
| Elevated | 120-129 | Less than 80 | Increased -- lifestyle changes needed |
| Stage 1 Hypertension | 130-139 | 80-89 | High -- lifestyle changes + possibly medication |
| Stage 2 Hypertension | 140 or higher | 90 or higher | Very high -- medication and lifestyle |
| Hypertensive Crisis | 180 or higher | 120 or higher | Emergency -- seek immediate care |
Understanding High Blood Pressure (Hypertension)
Hypertension affects approximately 45% of adults in the United States and similar proportions in South Asia, where rates are rising rapidly. It is defined by the AHA as a sustained blood pressure of 130/80 mmHg or higher on multiple readings. The 2017 reclassification (from the previous 140/90 threshold) means more people are now identified as hypertensive at an earlier, more treatable stage.
Types of Hypertension
Primary (essential) hypertension accounts for 90-95% of cases. It develops gradually over years without a single identifiable cause. Risk factors include age (risk doubles every decade over 45), family history, obesity, high sodium diet, physical inactivity, excessive alcohol, smoking, and chronic stress.
Secondary hypertension accounts for 5-10% of cases and is caused by an identifiable underlying condition including kidney disease, primary aldosteronism, thyroid disorders, obstructive sleep apnoea, renal artery stenosis, or certain medications (NSAIDs, oral contraceptives, decongestants).
Complications of Untreated Hypertension
Sustained hypertension silently damages blood vessels and organs over years. Key complications include:
- Stroke: Hypertension is the single largest risk factor for stroke -- both ischaemic (clot) and haemorrhagic (bleed)
- Heart attack: Damaged coronary arteries are more prone to blockage
- Heart failure: The heart works harder against elevated pressure, eventually weakening
- Kidney disease: Hypertension is the second leading cause of kidney failure
- Vision loss: Hypertensive retinopathy damages blood vessels in the eye
- Cognitive decline: Chronic hypertension increases dementia risk by 50%
High blood pressure is strongly linked to diabetes risk. Check your Diabetes Risk Score -- hypertension and diabetes frequently co-occur and each dramatically worsens the other's cardiovascular effects.
Understanding Low Blood Pressure (Hypotension)
Low blood pressure is generally defined as below 90/60 mmHg. While low blood pressure is often desirable and associated with longevity in young, healthy individuals, symptomatic hypotension can cause significant problems:
- Orthostatic hypotension: A drop of 20+ mmHg systolic upon standing, causing dizziness and falls -- particularly dangerous in older adults
- Postprandial hypotension: BP drops 1-2 hours after eating, causing lightheadedness -- common in older adults and those with Parkinson's
- Dehydration-related hypotension: Low blood volume from inadequate fluid intake reduces BP. Staying well hydrated is essential. Use our Water Intake Calculator for your personalised hydration target
How to Lower Blood Pressure Naturally
Lifestyle modifications are the cornerstone of blood pressure management and can reduce systolic BP significantly -- sometimes as much as medication:
DASH Diet -- Most Evidence-Based Dietary Approach
The DASH (Dietary Approaches to Stop Hypertension) diet reduces systolic BP by 8-14 mmHg. It emphasises: fruits and vegetables (8-10 servings/day), low-fat dairy, whole grains, lean proteins, nuts and legumes; while limiting sodium, red meat, sweets, and sugar-sweetened beverages. Find DASH-compatible South Asian recipes on Daily Health Kitchen.
Sodium Reduction
Reducing sodium from the typical Western intake of 3,400mg/day to under 2,300mg/day (ideally under 1,500mg for hypertensives) reduces systolic BP by 2-8 mmHg. Check your current sodium intake with our Sodium Calculator. Most dietary sodium comes from processed foods and restaurant meals, not from home cooking salt.
Regular Exercise
150 minutes of moderate-intensity aerobic exercise per week (brisk walking, cycling, swimming) reduces systolic BP by 5-8 mmHg. The effect is both acute (each exercise session temporarily lowers BP for 24 hours) and chronic (regular training lowers resting BP over months). Use our Heart Rate Calculator to find safe exercise zones.
Weight Loss
Each kilogram of excess weight lost reduces systolic BP by approximately 1 mmHg. Losing 10 kg can lower BP by 10 mmHg -- equivalent to one blood pressure medication. Use our BMI Calculator and Weight Loss Calculator to plan your weight management strategy alongside BP control.
Sleep
Poor sleep (under 6 hours per night) significantly increases hypertension risk. Blood pressure naturally dips 10-20% during sleep (called "nocturnal dipping") -- people who lack this dip have significantly higher cardiovascular risk. Use our Sleep Calculator to optimise your sleep cycles.
How to Measure Blood Pressure Accurately at Home
- Use a validated upper arm monitor: Wrist monitors are less accurate. Ensure the cuff fits your arm size correctly
- Prepare properly: Sit quietly for 5 minutes before measuring. Do not measure within 30 minutes of exercise, caffeine, or smoking
- Position correctly: Sit with back supported, feet flat on the floor, arm at heart level. Do not cross legs
- Take multiple readings: Take 2-3 readings 1 minute apart and record the average. The first reading is often highest
- Consistent timing: Measure at the same time each day -- morning (before medications and breakfast) and evening give the most useful readings
- Record and track: Keep a log for at least one week before appointments -- single readings are much less useful than trends
