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Blood Pressure Category Calculator

Classifies a systolic/diastolic blood pressure reading into the ACC/AHA 2017 categories (normal, elevated, stage 1, stage 2, hypertensive crisis) and reports mean arterial and pulse pressure.

When to use

You have a resting blood-pressure reading and want the standard adult category plus MAP and pulse pressure.

Do not use when: Diagnosing hypertension (requires repeated readings over time) or for children and pregnant women, who use different thresholds.

Formula

Normal <120 and <80; Elevated 120–129 and <80; Stage 1: 130–139 or 80–89; Stage 2: ≥140 or ≥90; Crisis: >180 and/or >120. MAP = DBP + (SBP − DBP)/3.

Inputs

Parameter	Type	Unit	Required	Description
`systolic_mmhg`	number	mmHg	yes	Upper reading. Range: ≥ 50, ≤ 300
`diastolic_mmhg`	number	mmHg	yes	Lower reading. Range: ≥ 20, ≤ 200

Outputs

Output	Type	Unit	Description
`category`	string		ACC/AHA 2017 blood pressure category.
`mean_arterial_pressure_mmhg`	number	mmHg	MAP ≈ diastolic + (systolic − diastolic) / 3.
`pulse_pressure_mmhg`	number	mmHg	Systolic − diastolic.

Example

118/76: {"systolic_mmhg":118,"diastolic_mmhg":76} → {"category":"Normal","mean_arterial_pressure_mmhg":90,"pulse_pressure_mmhg":42}

135/85: {"systolic_mmhg":135,"diastolic_mmhg":85} → {"category":"Hypertension stage 1"}

185/95: {"systolic_mmhg":185,"diastolic_mmhg":95} → {"category":"Hypertensive crisis (seek care immediately)"}

GET https://tttkmbb.com/api/v1/calculate/blood-pressure?systolic_mmhg=118&diastolic_mmhg=76

Machine access

API: GET https://tttkmbb.com/api/v1/calculate/blood-pressure (query parameters) or POST with a JSON body {"inputs": {...}}
Schema: https://tttkmbb.com/api/v1/calculators/blood-pressure · Markdown: https://tttkmbb.com/health/blood-pressure.md · JSON definition: https://tttkmbb.com/health/blood-pressure.json
MCP: server https://tttkmbb.com/mcp, tool run_calculator with calculator_id="blood-pressure"
OpenAPI operationId: classify_blood_pressure
Freshness: static. Authentication: none. Rate limit: fair use (see rate limits).

Sources

Whelton PK et al. (2018) 2017 ACC/AHA Guideline for High Blood Pressure in Adults, Hypertension 71:e13-e115 (standard)

FAQ

Do European guidelines differ?

Yes. ESC/ESH define hypertension from 140/90 mmHg and use 'high-normal' for 130–139/85–89; this calculator uses the US ACC/AHA 2017 scheme.

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