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Understand your home blood-pressure average

Build a clear home-reading log, see exactly which readings count, and prepare a useful summary for your clinician.

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Add your home readings

Enter top and bottom numbers in mmHg. Empty slots stay empty; missing readings are never treated as zero.

Two readings in the morning. Two in the evening.

Sit quietly and leave at least a minute between each pair. Aim for seven days; the NICE method needs at least four complete days.

Day 1 — excluded from average

Morning · reading 1

Morning · reading 2

Evening · reading 1

Evening · reading 2

For understanding and clinical discussion. No diagnosis, medication changes or supplement doses. If you feel acutely unwell, seek medical care.

Person taking a seated upper-arm blood pressure reading at home

What this result can tell you

A home blood-pressure average is more useful than one isolated reading. This tool keeps top and bottom numbers separate, checks the quality of your log and makes sure a very high reading is not hidden by the average.

Take a consistent set of readings

The NICE home-monitoring protocol uses two seated readings at least a minute apart, morning and evening, for at least four days and ideally seven. It excludes the first day when calculating the average. Follow a different schedule if your clinician instructed one.

Make the measurement trustworthy

Use a validated upper-arm monitor and the correct cuff size. Sit quietly with your arm supported and follow the monitor's instructions. Record the readings rather than choosing only the lowest ones.

An average is not a diagnosis

Targets depend on the guideline and your medical context. The tool reports a transparent average and completeness check; your clinician decides what it means for you.

How the very-high-reading reminder works

The reminder starts at a top number of 180 or a bottom number of 120, including the boundary itself. This is a cautious prompt to repeat a symptom-free reading and seek professional advice, not a diagnosis. AHA home guidance says above 180 or 120; NICE uses 180/120 or higher for clinic assessment. Those settings and recommendations are not interchangeable.

Food and everyday habits

These are general examples to adapt to your allergies, preferences and existing care plan. They do not predict a specific change in your result.

Compare the same food, with less salt

Packaged foods and sauces can be regular sources of sodium, which is part of salt. Compare two soups or sauces using the same amount on the label, and choose the suitable lower-sodium option. Source

Add flavour with herbs and spices

A DASH-style eating pattern supports blood-pressure management without relying on special products. Try herbs, spices or lemon with vegetables, a whole grain and a suitable lean protein. Source

Common questions

Why is day one excluded?

The NICE diagnostic home-monitoring protocol discards day one and averages the remaining readings. A shorter or different log can still be recorded here, but is clearly marked as incomplete or custom.

Can a good average cancel a very high reading?

No. This tool checks individual readings, including day one, before discussing an average. Serious new symptoms need urgent assessment regardless of the average.

Will my readings be saved automatically?

No. They stay in this browser tab and disappear when you reload or leave. Copy your summary explicitly if you want to keep it. No reading is sent to analytics.

Check the evidence

The sources below support the explanations and rules. Their publishers do not endorse this tool.

  1. Home blood-pressure monitoring protocol (opens in a new tab)

    NICE NG136

  2. Blood-pressure readings and when to seek help (opens in a new tab)

    American Heart Association

  3. DASH eating plan (opens in a new tab)

    NHLBI / NIH

  4. Measuring blood pressure at home (opens in a new tab)

    American Heart Association

Method

Average systolic and diastolic separately over included complete pairs. Exclude day one by default. Check every individual reading and symptoms before averaging.

Preserve the reported number. Compare before rounding. Round converted units only for display; average complete BP pairs separately and round only at the end.