Blood Pressure Calculator
Estimate your blood pressure with our free cardiovascular system calculator. See reference ranges, risk factors, and next-step guidance.
Reviewed by Rahul Singh, Health & Wellness Specialist
Formula
AHA Blood Pressure Categories: Normal <120/80, Elevated 120-129/<80, Stage 1 130-139/80-89, Stage 2 ≥140/≥90, Crisis >180/>120
Based on American Heart Association guidelines. MAP = (SBP + 2×DBP)/3. Pulse Pressure = SBP - DBP.
Worked Examples
Example 1: 130/85 mmHg
Problem:Systolic 130, Diastolic 85
Solution:Stage 1 Hypertension (≥130 or ≥80)
Result:Stage 1 Hypertension
Example 2: Athlete's Resting Reading
Problem:A 32-year-old runner records 108/68 mmHg at rest.
Solution:MAP = (108 + 2×68) / 3 = 81.3 mmHg. Pulse pressure = 108 - 68 = 40 mmHg. Both readings fall inside the Normal band (<120/80), consistent with the lower resting blood pressure often seen in trained endurance athletes.
Result:Normal — MAP 81.3 mmHg, pulse pressure 40 mmHg
Example 3: Newly Elevated Reading at a Pharmacy Kiosk
Problem:A 50-year-old checks their blood pressure at a pharmacy kiosk and gets 128/78 mmHg after a stressful commute.
Solution:128 systolic with diastolic under 80 falls in the Elevated category (120-129/<80), not yet hypertension. Because kiosk and one-off readings are easily skewed by stress or recent activity, the next step is to recheck after resting quietly for 5 minutes and to track home readings over several days rather than act on a single number.
Result:Elevated — recommend repeat measurement and home monitoring, not immediate diagnosis
References
Reviewed by Rahul Singh, Health & Wellness Specialist · Editorial policy