Health and Fitness
Compare one adult blood-pressure reading with the NICE clinic or home high-pressure threshold. This screening result cannot diagnose hypertension.
3 inputsInstant estimateScenario tool
Blood Pressure Chart Calculator
Enter your values below to get the result first, then scroll for the full explanation and guidance.
Single-reading threshold screen
Below high threshold128/82 mmHg
Single-reading threshold screen: Below high threshold (128/82 mmHg)
This compares one clinic reading with the applicable NICE high-blood-pressure threshold. It cannot diagnose hypertension.
Reading summary
This compares one clinic reading with the applicable NICE high-blood-pressure threshold. It cannot diagnose hypertension.
Result snapshot
A quick visual read of the values behind this result.
Systolic128 mmHg
Diastolic82 mmHg
Measurement contextClinic threshold: 140/90
Recommended next checks
- →A clinic reading at or above 140/90 should be repeated and normally confirmed with ambulatory or home monitoring.
- →For a reading at or above 180/120, follow urgent NHS clinical advice, especially if symptoms are present.
- Systolic
- 128 mmHg
- Diastolic
- 82 mmHg
- Measurement context
- Clinic threshold: 140/90
Try different values to compare results.
Choose clinic or home context and enter one adult reading. The result is a threshold reference, not a diagnosis, treatment recommendation or replacement for repeated measurements.
Single-reading threshold screen
Below high threshold128/82 mmHg
Single-reading threshold screen: Below high threshold (128/82 mmHg)
This compares one clinic reading with the applicable NICE high-blood-pressure threshold. It cannot diagnose hypertension.
Reading summary
This compares one clinic reading with the applicable NICE high-blood-pressure threshold. It cannot diagnose hypertension.
Result snapshot
A quick visual read of the values behind this result.
Systolic128 mmHg
Diastolic82 mmHg
Measurement contextClinic threshold: 140/90
Recommended next checks
- →A clinic reading at or above 140/90 should be repeated and normally confirmed with ambulatory or home monitoring.
- →For a reading at or above 180/120, follow urgent NHS clinical advice, especially if symptoms are present.
- Systolic
- 128 mmHg
- Diastolic
- 82 mmHg
- Measurement context
- Clinic threshold: 140/90
Try different values to compare results.
Table of Contents
Table of Contents
About Blood Pressure Chart Calculator
Blood Pressure Chart Calculator helps you work through the main numbers for this topic quickly with a simple input flow and an instant result.
Use the calculator result as a practical starting point, then review the explanation and assumptions on the page if you want more context.
How to use the threshold reference
NICE uses 140/90 mmHg as the clinic threshold and an average of 135/85 mmHg for ambulatory or home confirmation. A raised clinic reading normally needs repeat and out-of-clinic confirmation.
A reading at or above 180/120 mmHg needs prompt clinical handling under NICE guidance, particularly when concerning symptoms are present.
Formula explained
Calculation flow
This calculator is structured for fast UK-focused estimates with clear inputs, repeatable logic, and instant results.
Formula
Input values -> calculation engine -> instant result
How the result is built
1Enter the values requested in the form.
2The calculator applies the configured formula logic.
3The result updates instantly with a breakdown.
4Use the output to compare scenarios quickly.
Example
Example: 140/90 mmHg reaches the NICE clinic threshold; 135/85 mmHg reaches the home-average threshold.
Assumptions
- Adult single-reading reference only: clinic 140/90 mmHg, home average 135/85 mmHg and very high reading flag at 180/120 mmHg.
- Systolic and diastolic values must be whole numbers, and systolic must exceed diastolic.
- One reading cannot diagnose hypertension. Pregnancy, under-18s, symptoms, treatment decisions and personal targets are outside scope.
Source basis
- UK-focused calculator flow
- Structured input validation
- Instant result breakdowns
Trust and notes
Assumptions and important notes
This calculator is designed to give a fast estimate using the method shown on the page. Results are most useful when your inputs are accurate and the tool matches your situation.
Use the result as guidance rather than a final diagnosis or professional decision. If the result could affect health, legal, financial, or compliance decisions, verify it with a qualified source where appropriate.
- Adult single-reading reference only: clinic 140/90 mmHg, home average 135/85 mmHg and very high reading flag at 180/120 mmHg.
- Systolic and diastolic values must be whole numbers, and systolic must exceed diastolic.
- One reading cannot diagnose hypertension. Pregnancy, under-18s, symptoms, treatment decisions and personal targets are outside scope.
Method
UK calculator guidance
Last reviewed
April 17, 2026