Blood Pressure Category Calculator

Compare adult blood-pressure readings with the screening thresholds shown. Enter your own values below to see AHA adult reading category and check the method behind it.

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Your inputs

Change the example values to match your situation.

Your result

Let’s work it out.

Fill in your inputs and select Calculate.
Your result and breakdown will appear here.

How this calculator works

AHA adult categories use whichever of systolic or diastolic indicates the higher category.

Before you use the result

  • Estimates for general information. They do not diagnose a condition or replace a qualified clinician’s assessment.

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What is Blood Pressure Category Calculator?

Blood Pressure Category Calculator helps you compare adult blood-pressure readings with the screening thresholds shown.

The main result is AHA adult reading category. The formula, example and assumptions below explain how to interpret it.

How to use Blood Pressure Category Calculator

Use the example to get familiar with the form, then enter your own figures. Any rates in the example are illustrative. Check the field labels and units before calculating.

  1. Gather systolic pressure (mmHg) and diastolic pressure (mmHg). Use values from the same situation or reporting period.
  2. Replace the example systolic pressure with your own value, then complete the other fields. Check the displayed units.
  3. Select Calculate and read AHA adult reading category. Change one input and calculate again to compare a second scenario. Reset restores the original example.
  • Enter systolic pressure in mmHg, at least 50 and at most 300. Decimals are accepted.
  • Enter diastolic pressure in mmHg, at least 30 and at most 200. Decimals are accepted.

Blood Pressure Category Calculator: a worked example

With the inputs below, the result is Stage 1 hypertension (AHA adult reading category). Follow the example, then replace these illustrative values with your own.

A single reading cannot diagnose hypertension. Repeat readings and clinical assessment matter.

Example inputs and output
Input or outputExample value
Systolic pressure (mmHg)120 mmHg
Diastolic pressure (mmHg)80 mmHg
AHA adult reading categoryStage 1 hypertension

Understanding the Blood Pressure Category result

A single reading cannot diagnose hypertension. Repeat readings and clinical assessment matter.

Displayed results use a readable number of decimal places. When checking a result by hand, keep extra precision until the last step. To compare scenarios, change one input at a time and keep the others fixed.

Blood Pressure Category Calculator: assumptions and common mistakes

A useful estimate starts with the right inputs. Check the following assumptions and limits before applying the result to your situation.

  • Estimates for general information. They do not diagnose a condition or replace a qualified clinician’s assessment.
  • Health estimates are context-dependent. Age, pregnancy, illness, medication and individual measurements can affect interpretation; these tools do not diagnose a condition.

For wider guidance, visit World Health Organization. The formula and scope of this specific tool are stated on this page.

Blood Pressure Category Calculator FAQs

What does Blood Pressure Category Calculator calculate?

Blood Pressure Category Calculator helps you compare adult blood-pressure readings with the screening thresholds shown. Its main output is AHA adult reading category.

What inputs do I need for Blood Pressure Category Calculator?

You need systolic pressure (mmHg) and diastolic pressure (mmHg). Use the field labels and units to match your figures to the formula.

Which formula does Blood Pressure Category Calculator use?

AHA adult categories use whichever of systolic or diastolic indicates the higher category.

What is a worked example for Blood Pressure Category Calculator?

Example inputs: Systolic pressure: 120 mmHg; Diastolic pressure: 80 mmHg. The result is Stage 1 hypertension (AHA adult reading category).

How should I enter systolic pressure?

Enter systolic pressure in mmHg, at least 50 and at most 300. Decimals are accepted.

How do I choose diastolic pressure?

Enter diastolic pressure in mmHg, at least 30 and at most 200. Decimals are accepted. The example uses 80 mmHg; replace it if your circumstances differ.

How should I read AHA adult reading category?

A single reading cannot diagnose hypertension. Repeat readings and clinical assessment matter.

Why might my Blood Pressure Category Calculator result differ from my records?

Estimates for general information. They do not diagnose a condition or replace a qualified clinician’s assessment. Differences in entered values, units or rounding can also change the comparison.

Can I compare two scenarios in Blood Pressure Category Calculator?

Yes. Note your first AHA adult reading category, change systolic pressure or another input, and select Calculate again. Editing a field clears the old result so it is not mistaken for a new calculation.

Is Blood Pressure Category Calculator free, and where are my inputs calculated?

This calculator is free to use without signing in. Its formula runs in your browser; calculator inputs are not sent to a calculation API. The inputs reset to the example values when you reset the form or start a fresh page.