Blood Pressure Average Calculator

By CalculatorBolt Team | Published: Jan 15, 2025 | Updated: Jan 15, 2025 | Reviewed by: Health/Medical Editor

Calculate the average of multiple blood pressure readings. Input systolic/diastolic with date/time, filter by date range, and see mean, median, SD, and AHA classification. Informational only—consult a healthcare professional.

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AHA/ACC Blood Pressure Categories

Category Systolic (mmHg) Diastolic (mmHg)
Normal < 120 AND < 80
Elevated 120-129 AND < 80
Hypertension Stage 1 130-139 OR 80-89
Hypertension Stage 2 ≥ 140 OR ≥ 90

Source: American Heart Association / American College of Cardiology

Filter Readings

Blood Pressure Readings

Date Time Systolic
(mmHg)		 Diastolic
(mmHg)		 HR
(bpm)		 Notes Remove

1 mmHg = 0.133322 kPa

How it Works

We compute mean, median, and standard deviation for systolic and diastolic readings within a selected date range. Classification follows AHA/ACC guidelines based on the most recent mean.

Formulas:

Mean = Sum of all values / Count
Median = Middle value when sorted (or average of two middle values)
Standard Deviation = √(Σ(x - mean)² / (n - 1))

Inputs Explained

  • Date & Time: When the BP reading was taken. Helps track trends over time.
  • Systolic (mmHg): Top number; pressure when heart beats (70-250 range).
  • Diastolic (mmHg): Bottom number; pressure when heart rests (40-150 range).
  • Heart Rate (bpm): Optional; beats per minute (30-220 range).
  • Notes: Optional; record conditions (e.g., "after exercise", "morning reading").
  • Date Range Filter: Analyze specific time periods (e.g., last 30 days, last week).

Example

Readings:

  • Day 1: 120/80 mmHg
  • Day 2: 125/82 mmHg
  • Day 3: 130/85 mmHg

Calculation:

  • Mean Systolic: (120 + 125 + 130) / 3 = 125 mmHg
  • Mean Diastolic: (80 + 82 + 85) / 3 = 82.33 ≈ 82 mmHg
  • Median Systolic: 125 mmHg (middle value)
  • Median Diastolic: 82 mmHg (middle value)

Classification: Elevated (125/82 → Systolic 120-129 AND Diastolic < 80)

Tips & Notes

  • Take multiple readings at different times of day for a better average.
  • Measure at the same time each day for consistency (e.g., every morning before breakfast).
  • Rest for 5 minutes before taking a reading; sit quietly with feet flat on floor.
  • Use proper technique: Arm at heart level, cuff snug but not tight.
  • Classification is a quick reference; follow your doctor's advice for diagnosis.
  • Track trends over weeks/months rather than focusing on individual readings.
  • Consider white coat syndrome: Some people have higher BP in medical settings.

FAQs

Generally < 120/< 80 mmHg according to AHA guidelines. Use the calculator to see your average and classification based on multiple readings.

Sort all values from lowest to highest and pick the middle value. The calculator does this automatically for both systolic and diastolic readings.

No. It's an informational tool. Consult a qualified healthcare professional for medical diagnosis and treatment.

No. Everything runs in your browser. Use Export or Share Link to save your readings locally. No server-side storage.

Single readings can be affected by stress, time of day, or measurement errors. Multiple readings provide a more accurate picture of your blood pressure over time.

Mean is the average (sum ÷ count). Median is the middle value when sorted. Median is less affected by outliers (unusual readings).

⚠️ Disclaimer

Informational estimate only. Blood pressure classification is based on AHA/ACC guidelines and may not apply to all individuals. This tool is not a substitute for professional medical advice, diagnosis, or treatment. Consult a qualified healthcare professional for medical concerns.

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