Educational tool only. It does not diagnose conditions or replace medical care.
What This Blood Pressure Calculator Does
This blood pressure calculator helps you quickly interpret your readings using widely used adult blood pressure categories. Enter your systolic and diastolic values, and the calculator will show:
- Your blood pressure category (Normal, Elevated, Stage 1, Stage 2, or Crisis).
- Pulse pressure (systolic minus diastolic).
- Estimated mean arterial pressure (MAP).
- A short guidance note for what your result may mean.
How to Use It Correctly
1) Take a proper reading first
A good calculation starts with a good measurement. Sit quietly for at least 5 minutes, keep your feet flat on the floor, rest your arm at heart level, and avoid caffeine, nicotine, or exercise for about 30 minutes beforehand.
2) Enter systolic and diastolic values
Type your top number (systolic) and bottom number (diastolic). If you also know your pulse, you can add it, but it is optional and not required for classification.
3) Review your category
The category is based on standard clinical thresholds for adults. If systolic and diastolic fall in different ranges, the higher-risk category is used.
Blood Pressure Categories (Adults)
- Normal: Systolic < 120 and Diastolic < 80
- Elevated: Systolic 120–129 and Diastolic < 80
- High BP Stage 1: Systolic 130–139 or Diastolic 80–89
- High BP Stage 2: Systolic ≥ 140 or Diastolic ≥ 90
- Hypertensive Crisis: Systolic > 180 and/or Diastolic > 120
Understanding the Extra Metrics
Pulse Pressure
Pulse pressure is the difference between systolic and diastolic pressure. A typical resting pulse pressure is often around 40 mmHg, though normal can vary with age and health context.
Mean Arterial Pressure (MAP)
MAP estimates your average arterial pressure during one heartbeat cycle. A common approximation is: MAP = (Systolic + 2 × Diastolic) / 3. This is useful for understanding general perfusion pressure but should always be interpreted with clinical context.
Tips for Better Blood Pressure Tracking
- Measure at the same times each day, such as morning and evening.
- Take 2–3 readings one minute apart and record the average.
- Use a validated upper-arm cuff that matches your arm size.
- Track readings over time rather than reacting to one number.
- Share your home log with your healthcare professional.
When to Seek Medical Help
If your reading is in hypertensive crisis range (over 180 systolic or over 120 diastolic), wait five minutes and recheck. If it remains high or you have warning symptoms (chest pain, shortness of breath, severe headache, weakness, vision/speech changes), seek emergency care immediately.
Important Disclaimer
This calculator is an educational reference. It cannot diagnose hypertension, heart disease, kidney disease, or other conditions. Always consult a qualified medical professional for diagnosis and treatment.