Blood pressure phase graph
Plots your systolic and diastolic reading against NHS/NICE-style blood pressure ranges.
Your reading
Blood Pressure Range Calculator
Check a blood pressure reading against NHS/NICE-style low, ideal, raised, high, and very-high ranges.
Reading128/82 mmHgClinic reading
NHS-style rangeRaised / pre-high rangeAbove 120/80 but below 140/90 mmHg.
High threshold140/90 mmHgClinic threshold
Range assessment
AssessmentAbove 120/80 but below 140/90 mmHg.Raised / pre-high range
Main driverBoth systolic and diastolic
Reading contextClinic / professional
Very high thresholdNICE severe hypertension threshold uses clinic 180/120 mmHg or higher.180/120 mmHg
NHS/NICE-style bands
Low rangeCan sometimes cause faintness or dizziness.90/60 or lower
Ideal / normal rangeAdult general guide.90/60 up to 120/80
Raised / pre-high rangeNot high, but above ideal.120/80 up to 140/90 mmHg
High rangeClinic threshold.140/90 mmHg or higher
Very high rangeNeeds prompt clinical attention, especially with symptoms.180/120 mmHg
Cautions
AgeAdult reading.45 years
Medical contextUse normal adult interpretation limits and measurement technique cautions.General adult
Symptoms selectedNo symptom warning selected.No
Assumptions
Calculation notes
- Independent calculator using NHS and NICE published adult blood-pressure thresholds. It is not an official NHS service.
- This calculator does not diagnose high blood pressure, low blood pressure, symptoms, heart attack, stroke, pregnancy problems, or any medical condition.
- NHS blood-pressure tools are for adults aged 18 or over with a recent reading, and are not intended for pregnancy, recent surgery or injury, relevant medical conditions, medicines affecting blood pressure, or new worrying symptoms.
- NHS guidance says high blood pressure is usually 140/90 mmHg or higher in clinic, or 135/85 mmHg or higher when checked at home.
- NICE defines severe hypertension as a clinic reading of 180/120 mmHg or higher. If you feel unwell or have worrying symptoms, use NHS 111/999 guidance.
Reading context
How the blood-pressure range is shown
The chart places one reading into broad regions without turning it into a diagnosis.
Range mapping
The calculator places systolic and diastolic readings into broad NHS/NICE-style ranges and marks the entered reading on a phase chart.
It is designed to help users understand a reading, not diagnose hypertension.
Reading pathsystolic and diastolic reading -> broad range category -> phase chart position
135/85 example
Example: 135/85 mmHg
- Systolic: 135
- Diastolic: 85
Result: The reading is plotted against the range bands used by the calculator.
Single readings can be affected by stress, caffeine, exercise and cuff fit, so clinical diagnosis normally needs repeat measurements.
When to treat it cautiously
- Very high readings or symptoms need urgent NHS or clinical advice.
- Home and ambulatory readings are often interpreted differently from a single clinic reading.
Content reviewed: 7 September 2026.
Guide
Blood Pressure Range Calculator notes
Enter systolic and diastolic blood pressure to see an NHS/NICE-style range assessment, charted against key mmHg thresholds for clinic or home readings.
FAQs
Blood Pressure Range Calculator FAQs
What is the Blood Pressure Range Calculator for?
Enter systolic and diastolic blood pressure to see an NHS/NICE-style range assessment, charted against key mmHg thresholds for clinic or home readings.