Free Blood Pressure Calculator: Check Your Reading Online

Enter your systolic and diastolic readings to instantly determine your blood pressure category based on the latest American Heart Association (AHA) guidelines.

What Do Your Blood Pressure Numbers Mean?

Blood pressure is the force of blood pushing against artery walls. A reading has two numbers that are crucial indicators of your heart health. Consistently high blood pressure (hypertension) increases the risk of serious health issues, making regular monitoring essential.

  • Systolic (top number): The pressure when your heart beats.
  • Diastolic (bottom number): The pressure when your heart rests between beats.

The 5 Blood Pressure Categories (AHA Guidelines)

CategorySystolic (mmHg)Diastolic (mmHg)
NormalLess than 120Less than 80
Elevated120 – 129Less than 80
High BP (Stage 1)130 – 13980 – 89
High BP (Stage 2)140 or higher90 or higher
Hypertensive CrisisHigher than 180Higher than 120

Disclaimer: This tool is for informational purposes only. Consult with a healthcare professional for medical advice, diagnosis, or treatment.

Check Your BP Category

Maintained by Live Fitness Check. Last updated: August 9, 2026. How we test our calculators .

About This Calculator

Blood Pressure Calculator classifies a blood-pressure reading from systolic and diastolic values. It is designed to give a quick, understandable estimate from systolic and diastolic blood pressure so the result can be used as a starting point for learning, tracking or a more informed discussion.

Methodology

Inputs used: Systolic and diastolic blood pressure.
Calculation approach: The entered readings are compared with adult blood-pressure categories used by the calculator to return the corresponding category.
Interpretation: Results are presented as an estimate and should be read together with the limitations described below.

Sources

American Heart Association — Understanding Blood Pressure Readings: https://www.heart.org/en/health-topics/high-blood-pressure/understanding-blood-pressure-readings

Frequently Asked Questions

What does the Blood Pressure Calculator estimate?

Classifies a blood-pressure reading from systolic and diastolic values.

How is this result calculated?

The entered readings are compared with adult blood-pressure categories used by the calculator to return the corresponding category. The calculation uses systolic and diastolic blood pressure.

How should I use the result?

A single reading cannot diagnose hypertension; correct measurement technique and repeated readings matter. Use the number as an estimate and consider professional advice when the result may affect health, treatment, pregnancy, nutrition, exercise safety or another important decision.