What does this tool do?
Blood pressure is written as systolic over diastolic pressure. This calculator applies common American Heart Association screening bands to a single reading and shows pulse pressure as an additional number.
The Formula
Normal <120/<80; elevated 120–129/<80; stage 1 130–139 or 80–89; stage 2 ≥140 or ≥90; crisis >180 or >120Frequently Asked Questions
Does one high reading mean hypertension?
No. Diagnosis usually requires repeated readings on separate occasions, often with home monitoring. A single elevated reading can reflect stress, caffeine or measurement error.
What should I do about a very high reading?
A reading above 180/120 mmHg needs prompt medical attention, especially with chest pain, breathlessness or vision changes. This tool cannot assess symptoms.