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Blood Pressure Calculator

AHA 2017 guidelines · MAP & Pulse Pressure · ISH/IDH detection · BP tracker & cardiovascular risk analysis

Blood Pressure Reading
For informational purposes only. Consult a healthcare provider for diagnosis and treatment.
Blood Pressure Category
Normal
120/80 mmHg
Systolic Position
▼
Low<90NormalElevatedStage 1Stage 2Crisis
MAP = (Sys + 2×Dia) ÷ 3 PP = Sys − Dia
Systolic
120 mmHg
Diastolic
80 mmHg
MAP
93 mmHg
Pulse Pressure
40 mmHg
Category
Normal
Risk Level
Low
BP Position Map
Chart: bp position map.
All-time Average
—
Total Readings
0
Trend
→ Stable
Highest
—
Lowest
—
Std Deviation
—
Systolic & Diastolic Trend
Chart: systolic & diastolic trend.
Systolic Diastolic 120/80 target 130 HTN
Reading Log
Date & Time Reading Pulse Category Notes
No readings logged yet.
Risk Factor Inputs

Uses your current BP reading plus additional risk factors for a simplified 10-year cardiovascular risk estimate.

This is a simplified risk estimate for educational purposes. For clinical risk scoring, use the ACC/AHA Pooled Cohort Equations or consult your physician.
Estimated 10-Year CVD Risk
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What-If Scenarios
If you lower systolic by 10 mmHg
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If you quit smoking
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Potential BP Reduction from Lifestyle Changes
Chart: risk chart.
Personalized Recommendations

What is a normal blood pressure reading?

Normal blood pressure is below 120/80 mmHg. Elevated is 120-129 systolic with less than 80 diastolic. Stage 1 hypertension is 130-139/80-89, and Stage 2 is 140+/90+. Blood pressure should be measured at rest for accurate readings.

How to Use the Blood Pressure Calculator — AHA Categories

1

Enter Your Details

Fill in the input fields with your data — biological sex, reading 1 sys, reading 1 dia, and reading 2 sys. The calculator updates results instantly as you type, so there's no submit button to press.

2

Explore Different Views

Use the tabs (Calculator, BP Tracker, Risk Analysis) to switch between different analysis modes. Adjust presets, toggle options, or compare scenarios to see how changes affect your results.

3

Review & Share Results

Read your results in the output panel. Use the Share button to generate a link with your inputs pre-filled, or copy results to your clipboard. All calculations happen locally in your browser — your data is never sent to a server.

Formulas & Methods

Clamped

Math.max(GAUGE_SYS_MIN, Math.min(GAUGE_SYS_MAX, sys))

Map

(sys + 2 * dia) / 3

Avg

function(a) { return sum(a) / a.length

Key Terms

Biological SexAn input parameter used in blood pressure calculations. Adjust this value to see how it affects your results.
Reading 1 SysAn input parameter used in blood pressure calculations. Adjust this value to see how it affects your results.
Reading 1 DiaAn input parameter used in blood pressure calculations. Adjust this value to see how it affects your results.
Reading 2 SysAn input parameter used in blood pressure calculations. Adjust this value to see how it affects your results.
Reading 2 DiaAn input parameter used in blood pressure calculations. Adjust this value to see how it affects your results.
Reading 3 SysAn input parameter used in blood pressure calculations. Adjust this value to see how it affects your results.

Real-World Examples

AL

Alex

28-year-old software engineer starting a fitness journey

Biological Sex
Male
Reading 1 Sys
124 mmHg
Reading 1 Dia
82 mmHg
Reading 2 Sys
122 mmHg
Result
Stage 1 High BP

Try entering Alex's values above to see the detailed breakdown.

Understanding Blood Pressure

What Is Blood Pressure?

Blood Pressure is a fundamental concept that this calculator helps you understand and apply. Whether you're a beginner or experienced professional, having precise calculations at your fingertips saves time and reduces errors.

Why It Matters

Understanding blood pressure helps you make informed decisions backed by data rather than guesswork. Small miscalculations can compound into significant errors, making accurate tools essential for planning and analysis.

How It Works

The Blood Pressure Calculator — AHA Categories applies established formulas and methodologies to your specific inputs. Results update in real-time, letting you experiment with different scenarios to find the optimal approach for your situation.

Tips & Best Practices

  • Start with realistic values — use actual data when available rather than rough estimates for more meaningful results.
  • Compare scenarios — try different input combinations to understand how each variable affects the outcome.
  • Save your work — use the Share button to bookmark specific calculations for future reference.
  • Consult professionals — for critical decisions, use calculator results as a starting point and verify with a qualified expert.
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Frequently Asked Questions

Basics Why are my blood pressure readings different each time?
Blood pressure naturally fluctuates based on activity, stress, hydration, posture, and time since your last meal. The AHA recommends taking 2-3 readings one minute apart at the same time each day and averaging them.
Basics What is the difference between systolic and diastolic pressure?
Systolic (top number) measures pressure when your heart beats. Diastolic (bottom number) measures pressure when your heart rests. Elevated systolic is a stronger predictor of cardiovascular events in adults over 50, while elevated diastolic is more concerning in younger adults.
Basics What is isolated systolic hypertension?
ISH occurs when systolic is 130+ mmHg while diastolic remains below 80. It is the most common form of hypertension in older adults, caused by arterial stiffening. ISH significantly increases stroke and heart attack risk.
Basics How does salt raise blood pressure?
Excess sodium causes water retention, increasing blood volume and pressure. About 50-60% of hypertensive people are salt-sensitive. The AHA recommends no more than 2,300 mg/day, ideally under 1,500 mg.
Basics Can exercise temporarily spike blood pressure?
During intense exercise, systolic can temporarily rise above 200 mmHg, which is normal. However, an exaggerated response (above 210 in men or 190 in women) may predict future hypertension. If you have uncontrolled hypertension (above 180/110), consult your doctor before vigorous exercise.
Advanced How accurate is the 10-year risk estimate?
Our simplified estimate is for educational purposes. It uses a Framingham-style approach but is not a substitute for the full ACC/AHA Pooled Cohort Equations. For clinical risk scoring, consult your physician who can factor in additional variables.