Tools · Health
Blood pressure log
Between the paper log and the app store: readings in four keystrokes, 7 and 30-day averages classified by the standard ACC/AHA categories, mornings split from evenings, and a clean printed report for the appointment. No app to install, no account — your readings stay in your browser.
The categories, exactly as defined
| Category | Systolic (mm Hg) | Diastolic (mm Hg) | |
|---|---|---|---|
| Normal | below 120 | and | below 80 |
| Elevated | 120–129 | and | below 80 |
| High — Stage 1 | 130–139 | or | 80–89 |
| High — Stage 2 | 140 or higher | or | 90 or higher |
| Hypertensive crisis | above 180 | and/or | above 120 |
Source: the 2017 ACC/AHA hypertension guideline, as published by the American Heart Association. A reading is classified by the higher category either number reaches.
Questions people actually ask
- What do the categories mean?
- They are the 2017 ACC/AHA guideline categories used across US medicine: Normal is below 120 and below 80; Elevated is 120–129 with diastolic still below 80; Stage 1 hypertension is 130–139 or 80–89; Stage 2 is 140 or higher, or 90 or higher; and a reading above 180 or above 120 is a hypertensive crisis. A reading lands in the highest category either number reaches. The tool classifies both individual readings and your multi-day averages — averages are what clinicians actually reason from.
- Why track at home at all?
- Because a single office reading is a poor sample: some people run high at the clinic ("white coat" readings) and normal at home, others the reverse. Home series taken at consistent times — typically morning and evening, seated, after a few minutes of rest — give your clinician far better information. That is also why this log splits your morning and evening averages instead of blending them.
- Can I show this to my doctor?
- That is the point of the print button: a clean table of every reading with dates, times and categories, plus your 30-day average and the morning/evening split at the top — the format a clinician can scan in seconds. The CSV export carries the same data for anyone who wants it digitally.
- Is my data private?
- Yes, and structurally: readings live in your browser, and nothing is uploaded. Blood pressure history is health data, and this page carries no advertising and never will — the same rule this site applies to its period tracker and sleep journal. If you sign in for cross-device sync, the data sits in your private account row, exportable and deletable any time from My profile.
- Is this a medical device?
- No. It is a log — it records what your monitor said and does honest arithmetic on it. It does not validate your monitor, diagnose anything, or replace clinical judgement. Bring the numbers to a professional; and if a reading is above 180/120 and stays there on re-measurement, seek care immediately rather than logging it.
Read this before relying on it
This is a log, not a medical device and not medical advice. It records what your monitor reported and averages it honestly; it cannot verify your monitor, your technique, or your health. Category labels follow a published guideline but classifying a number is not diagnosing a person — that is a clinician’s job, done with far more than these readings. And a reading above 180/120 that persists on re-measurement is a reason to seek care now, not to keep logging.