Normal blood pressure by age: why adults do not use an age chart
UK guidance does not give every adult age group a different normal range. Age can affect treatment targets, but home readings are still judged from a consistent series.
Updated 3 min read
A search for “normal blood pressure by age” often leads to a table with a different pair of numbers for each decade. That is not how UK adult guidance diagnoses high blood pressure. NICE NG136 uses the same diagnostic thresholds for adults under and over 80: a clinic reading of 140/90 mmHg or higher, confirmed by a daytime or home average of 135/85 mmHg or higher.
Age can change a treatment target after a diagnosis. It does not turn a high home average into a normal one simply because high readings are more common later in life.
The UK thresholds for adults
The NHS says blood pressure is usually considered high when it is 140/90 or higher when checked by a healthcare professional, or 135/85 or higher when checked at home.
These are not interchangeable measurements. A GP surgery reading captures one setting. A home average is built from repeated readings taken under similar conditions. NICE normally confirms a diagnosis by combining the clinic result with home monitoring or a 24-hour ambulatory monitor.
BP Diary also includes the 2024 European Society of Cardiology guideline as a reference system. Its lower category boundary is 120/70 mmHg, but it uses the same 135/85 mmHg home threshold for hypertension. The blood pressure calculator shows the selected reference and does not use age to re-label a reading.
Why age tables can mislead
An average for an age group answers, “What readings are common among people this age?” A clinical threshold answers, “At what level does guidance recommend assessment?” Those are different questions.
If an online table shows a higher average for older adults, that does not create a personal target. It also cannot account for the place of measurement, a series of readings, other health conditions or a clinician’s judgement. That is why a simple decade-by-decade chart is a poor substitute for UK guidance and your own record.
Where age does affect treatment targets
NICE does make an age distinction for people who already have hypertension and are being treated. For adults under 80, it recommends maintaining clinic blood pressure below 140/90 mmHg. For adults aged 80 or over, the clinic target is below 150/90 mmHg.
For home or daytime ambulatory averages, the corresponding targets are below 135/85 mmHg for adults under 80 and below 145/85 mmHg for adults aged 80 or over. NICE also tells clinicians to use judgement for people with frailty, several long-term conditions or particular treatment needs.
These are treatment targets, not a new definition of normal. A GP sets and reviews them for an individual. An app cannot infer a personal target from age alone.
What about children and teenagers?
This article and BP Diary’s adult reference ranges are not designed to interpret a child’s blood pressure. Paediatric assessment depends on factors such as age, sex and height and should be done by an appropriately trained healthcare professional. Do not use an adult calculator or an adult age chart to interpret a child’s reading.
Use your own week, not a generic age row
For home monitoring, NICE asks for two seated readings at least one minute apart, twice a day, ideally morning and evening. Continue for at least four days and ideally seven. The first day’s readings are left out and the rest are averaged.
The average blood pressure calculator can do that arithmetic, while the printable blood pressure diary gives you a paper record. How to keep a blood pressure diary explains the routine and what to take to a GP appointment.
BP Diary keeps cuff readings, pulse and notes together. It can show averages for a period and produce a report, but it does not diagnose high blood pressure or set a treatment target. Discuss your home average with your GP or another healthcare professional.