Blood Pressure Category Checker
Enter a blood pressure reading to see where it falls in the standard ACC/AHA categories — from normal through elevated to stage 1 and stage 2 hypertension. Educational context for numbers you should also discuss with a doctor.
How to use this calculator
- Rest seated for 5 minutes, feet flat, arm supported at heart level, then measure.
- Enter the systolic (top) and diastolic (bottom) numbers.
- Press Check — and log readings over days, since single measurements mislead.
Formula used
Either number can place you in a category: 125/85 is Stage 1 because of the diastolic. Pulse pressure is systolic minus diastolic; mean arterial pressure ≈ diastolic + one-third of pulse pressure.
Example calculation
118/76 — Normal (both numbers under the 120/80 line).
135/82 — Stage 1 hypertension: the systolic sits in the 130–139 band, and the higher band always wins.
Reading the two numbers
Systolic pressure is the surge when the heart beats; diastolic is the baseline between beats. Both matter — sustained elevation of either strains arteries, heart, kidneys and brain silently, which is why hypertension screening exists at every clinic visit.
Single readings are noisy: stress, caffeine, a full bladder or "white coat" nerves can add 10–20 mmHg. Guidelines therefore diagnose on repeated proper measurements, often with home monitoring. What the categories do is tell you when those conversations and re-measurements should happen — and the crisis threshold tells you when not to wait.
Why use this calculator?
- Translate a home-monitor reading into the standard clinical category.
- Learn the thresholds — 2017 guidelines moved them lower than many remember.
- Know the crisis line (180/120) that changes the urgency entirely.
Frequently asked questions
Is 130/85 high blood pressure?
Under current ACC/AHA guidelines, yes — Stage 1 hypertension (systolic 130–139 or diastolic 80–89). Earlier guidelines called this "prehypertension", which is why many people are surprised. Confirmed Stage 1 usually means lifestyle changes first, medication depending on overall risk.
Why is my blood pressure different every time I measure?
BP naturally swings 10–20 mmHg with time of day, stress, caffeine, talking and posture. Measure rested, seated, same time daily, and average several readings — clinicians diagnose from patterns, not single values.
Can I lower blood pressure without medication?
Often meaningfully: reducing sodium (−5 to −6 mmHg), regular aerobic exercise (−5 to −8), weight loss (~1 mmHg per kg), limiting alcohol, and the DASH diet each help, and they stack. Whether they suffice instead of medication is a decision to make with your doctor based on your numbers and risk.