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GuideMay 2026· 8 min read
Measuring blood pressure: how to do it correctly
Measuring your blood pressure yourself is easy — but small mistakes quickly lead to wrong values. A wrongly fitted cuff, the wrong posture or a full stomach can clearly distort the result. Yet regular self-measurement is a valuable tool for recognizing high blood pressure and checking a therapy.
What this is about
Instructions for the correct self-measurement of blood pressure at home: two values (systolic/diastolic in mmHg), avoiding the most common mistakes (cuff height, speaking, crossing the legs, a lack of rest), placing the values. An optimal practice value is usually around 120/80 mmHg — the individual target values are set by the doctor.
1. Why measuring blood pressure is important
High blood pressure (hypertension) is one of the most important risk factors for heart attack, stroke, and heart and kidney damage. The treacherous part: it often causes no symptoms for years — many affected people do not even know that their blood pressure is too high. That is why high blood pressure is also called the "silent killer".¹
Measuring blood pressure makes this invisible risk factor visible. Regular self-measurement at home has several advantages:
Early detection: blood pressure that is too high is noticed before consequential damage arises
Therapy control: with treated high blood pressure it shows whether the medications work well
More values, more meaning: home measurements over several days are often more meaningful than a single measurement at the doctor's
Less white coat effect: at home you are more relaxed (its own chapter)
Active participation: anyone who knows their values can help shape the treatment better
But for the self-measurement to really be useful, it has to be carried out correctly — otherwise wrong values arise that unsettle or lead to wrong decisions.
2. Understanding the two blood pressure values
Blood pressure is always given with two values, in the unit mmHg (millimetres of mercury), e.g. "120 over 80":
Systolic value (upper value): the pressure when the heart contracts and pumps the blood into the vessels — the higher of the two values
Diastolic value (lower value): the pressure when the heart relaxes between two beats and fills with blood — the lower value
Pulse: most devices additionally show the pulse (heartbeats per minute)
Both values are important. An optimal blood pressure when measured in the practice is usually around 120/80 mmHg. But what counts as "too high" and which target values apply to you depends on individual factors (age, accompanying diseases) and is set by the doctor.
3. Upper-arm or wrist device?
For self-measurement there are two device types. The choice influences the accuracy:
Upper-arm device (recommended)
Upper-arm devices are regarded as more accurate and reliable and are recommended by professional bodies. The cuff is placed on the upper arm, roughly at heart level. What is important is the correct cuff size — a cuff that is too small or too large distorts the values.
Wrist device
Wrist devices are handy and practical for when you are out and about, but more prone to error — above all because the wrist has to be held exactly at heart level during the measurement. With correct use they can deliver usable values, but for regular control an upper-arm device is usually the better choice.
Tip: choose a validated device — and have it checked when you get the chance
Choose a tested device validated for self-measurement (corresponding information is available from professional bodies and at the pharmacy). Have the cuff size and the function checked when you get the chance at the practice or pharmacy — and bring your device to the doctor's appointment to compare it with the practice measurement.
4. Preparation: the right conditions
Before you measure, ensure the right conditions — this is decisive for correct values:
Sit quietly for 5 minutes before the measurement — do not measure directly after exertion, climbing stairs or excitement.
No stimulants shortly beforehand — about 30 minutes beforehand no coffee/caffeine, no smoking, no alcohol.
Do not measure with a full bladder — this can raise the value.
A quiet environment, relaxed, not stressed.
Comfortable clothing — the arm should be free; a rolled-up, constricting sleeve distorts the measurement.
Always measure on the same arm — best on the arm with the higher values (test once on both arms).
This preparation sounds laborious, but it makes the difference between a reliable and a misleading value. The 5 minutes of rest before the measurement in particular are often forgotten.
5. Step by step: measuring correctly
This is how you measure blood pressure correctly (using the example of the recommended upper-arm device):
Sit down quietly
On a chair with a backrest, feet flat on the floor, do not cross your legs, relax for 5 minutes.
Put on the cuff
On the free upper arm, about 2–3 cm above the crook of the elbow, not too loose and not too tight (one finger should still fit underneath).
Arm at heart level
Lay the arm relaxed on a table so that the cuff is roughly at heart level — the arm is supported, not held in the air.
During the measurement
Sit quietly, do not speak, do not move, breathe in a relaxed way.
Start the measurement
And let the device do its work.
Read off and note the value
Systolic, diastolic, pulse.
Second measurement
After a 1–2 minute break measure again; with a clear difference possibly a third measurement — usually the average is used.
The second (and possibly third) measurement is important, because the first value often comes out somewhat higher. Note the values right away — best digitally, so the course is preserved.
6. The most common measurement mistakes
These mistakes distort the values most often — and are easy to avoid:
No rest before the measurement — directly after movement or excitement the values are too high.
Speaking during the measurement — can clearly raise the value.
Arm not at heart level — an arm that is too low raises, one that is too high lowers the value.
Crossed legs or a lack of back support — raise the value.
The wrong cuff size — too small measures too high, too large too low.
Measured over clothing or a constricting rolled-up sleeve.
A full bladder, coffee/nicotine shortly beforehand.
Only a single measurement instead of several values.
A single high value is not yet high blood pressure
Blood pressure naturally fluctuates over the course of the day and reacts to stress, movement and emotions. Only repeatedly elevated values (on several days, correctly measured) are meaningful. Do not let a single outlier unsettle you, but document the values and discuss persistently high values with the doctor.
7. How often and when should you measure?
How often you measure depends on the situation:
For diagnosis/adjustment: often over about a week, two measurements each in the morning and evening — according to the doctor's instructions
In the morning: before taking the blood pressure medications and before breakfast
In the evening: before going to bed, not directly after eating or alcohol
With stably adjusted blood pressure: less often, on the doctor's recommendation (e.g. a few days a month)
Do not measure "compulsively" all the time: measuring far too often often unsettles more than it helps
What is important is regularity and the correct technique, not the sheer number of measurements.
8. Documenting the values correctly
Single values are not very meaningful — the course counts. Good documentation helps you and your doctor:
Note the date, time and both values (plus pulse)
Record morning and evening values separately
Note particularities (e.g. stress, poor sleep, a forgotten tablet)
Document over several days/weeks — this makes patterns and trends visible
Bring it to the doctor's appointment — the home values are a valuable basis for decisions
A digital blood pressure diary is practical, because it presents the course clearly and nothing gets lost. The documented values help the doctor to adjust the therapy in a targeted way — often more meaningful than the single measurement in the practice.
9. Placing the blood pressure values
General classifications serve as a rough orientation — but the individual target values are always set by the doctor:
Optimal: roughly around 120/80 mmHg (practice measurement)
Normal to high-normal: values above this, but still below the hypertension threshold
High blood pressure: from permanently elevated values (the exact threshold values and degrees of severity are set by guidelines and the doctor)
Home measurement values tend to be somewhat lower than practice values — the threshold values for self-measurement are adjusted accordingly
Blood pressure that is too low: can go along with dizziness, but is usually less dangerous than blood pressure that is too high
Important: the assessment depends on the overall picture — single values, the individual risk, accompanying diseases and the course play together. What is a good target value for one person can differ for another. Persistently elevated values belong in a medical assessment.
10. The white coat effect and the practice measurement
A well-known phenomenon: in some people the blood pressure is higher at the doctor's practice than at home — purely through the tension in the medical environment. This is called "white coat hypertension" or the white coat effect:
White coat effect: elevated values only in the practice, normal at home — the home measurement reveals this
The reverse (masked hypertension): normal practice values, but elevated values at home — likewise important to recognize
24-hour blood pressure monitoring: the doctor can have the blood pressure recorded over 24 hours to get a realistic picture
That is exactly why the home measurement is so valuable: it complements the practice measurement and gives a more realistic picture of "everyday blood pressure". Bring your documented home values to the appointment — they help to distinguish the white coat effect from genuine high blood pressure.
11. When the values should be clarified medically
Self-measurement does not replace the doctor. In the following situations you should seek medical advice:
Repeatedly elevated values on several days (correctly measured)
Very high values — clearly above your usual range
Strongly fluctuating values or an irregular pulse (a possible indication of cardiac arrhythmias)
Accompanying symptoms such as headache, dizziness, visual disturbances, chest pain, shortness of breath
Very low values with complaints (dizziness, a tendency to faint)
Under therapy: when the target values are not reached or side effects occur
Emergency: hypertensive crisis
With very strongly elevated blood pressure with symptoms such as severe headache, visual disturbances, chest pain, shortness of breath, neurological deficits (paralysis, speech disturbance) or confusion, call 112 immediately (in the US: 911) — this is an emergency. Also seek medical help with suddenly very low blood pressure with fainting.
12. Lifestyle: what lowers blood pressure
Besides medications (e.g. valsartan, ACE inhibitors like ramipril, beta blockers like bisoprolol), lifestyle has a big influence on blood pressure:
A low-salt diet: less salt can clearly lower blood pressure
Weight reduction with excess weight — one of the most effective levers
A Mediterranean, vegetable-rich diet has a favourable effect
Never stop the therapy on your own — not even with good values
A healthy lifestyle supports the drug therapy and with slightly elevated blood pressure can sometimes even save medications. But: never stop a prescribed blood pressure therapy on your own because of good values — the blood pressure would rise again. More under high blood pressure.
brite: your blood pressure diary
Document systolic, diastolic and pulse with date and time, be reminded of the regular measurement and of the blood pressure medications — and at the next doctor's appointment have the real course with you instead of a vague memory. That is exactly what brite is for.
FAQ: common questions about measuring blood pressure
It is best to always measure on the same arm — namely the one with the higher values. To find out which that is, measure once on both arms; the arm with the higher value is the measuring arm from then on. Slight differences between the arms are normal, larger lasting differences should be clarified medically. What matters is consistency, so the values stay comparable.
The first value often comes out somewhat higher, because you have not quite come to rest yet or the measurement itself tenses you slightly. That is why it is recommended to measure a second time after a 1–2 minute break and usually to use the average. The 5 minutes of rest before the first measurement are also important. A single higher first value is therefore no cause for concern.
Upper-arm devices are regarded as more accurate and reliable and are recommended by professional bodies for regular self-measurement. Wrist devices are practical for when you are out and about, but more prone to error — above all because the wrist has to be held exactly at heart level. For reliable control at home, a validated upper-arm device with a suitable cuff size is the better choice.
This depends on the situation. For diagnosis or a new adjustment, it is often measured over about a week, twice each in the morning and evening. With stably adjusted blood pressure, less often is enough, e.g. a few days a month — on the doctor's recommendation. More important than the amount is the correct technique and regularity. Measuring far too often, "compulsively", often unsettles more than it helps.
The upper (systolic) value is the pressure when the heart contracts and pumps blood into the vessels — the higher value. The lower (diastolic) value is the pressure when the heart relaxes between two beats and fills — the lower value. Both values are important. An optimal practice value is usually around 120/80 mmHg; the individual target values are set by the doctor.
With the white coat effect, blood pressure is higher at the doctor's practice than at home — purely through the tension in the medical environment. The home measurement reveals this and gives a more realistic picture of everyday blood pressure. The opposite also exists (masked hypertension: normal in the practice, elevated at home). That is why home values and possibly a 24-hour measurement are valuable additions to the practice measurement.
No. Blood pressure naturally fluctuates over the course of the day and reacts to stress, movement, coffee or emotions. A single high value — especially if it was not measured under resting conditions — does not yet mean high blood pressure. Only repeatedly elevated values on several days, correctly measured, are meaningful. Document the values and discuss persistently high values with the doctor.
The morning measurement is usually done before taking the blood pressure medications and before breakfast — this way you capture the value before the fresh dose takes effect. This helps the doctor to assess whether the medication is enough over 24 hours. The exact recommendation can vary depending on the therapy — if in doubt, discuss it with the doctor. What matters is to handle it consistently the same way, so the values stay comparable.
Yes. Caffeine can raise blood pressure in the short term. That is why you should not drink coffee or other caffeinated drinks about 30 minutes before the measurement, nor smoke or drink alcohol. Physical exertion and excitement shortly before the measurement also distort the value. For a reliable result, the 5 minutes of rest and avoiding such influences directly beforehand are decisive.
No, not on your own. Good values under therapy mean that the medications are working — not that the high blood pressure has disappeared. If the therapy is stopped, blood pressure usually rises again. A reduction or stopping only makes sense after consulting the doctor and under control, for example when a lasting improvement has been achieved through lifestyle changes. Always discuss such steps with your doctor.
Deutsche Hochdruckliga (DHL) — Empfehlungen zur Blutdruck-Selbstmessung. hochdruckliga.de
Europäische Leitlinien zur arteriellen Hypertonie (ESC/ESH). escardio.org
Deutsche Herzstiftung — Blutdruck richtig messen. herzstiftung.de
Nationale VersorgungsLeitlinie / DEGAM — Hypertonie. leitlinien.de
Medical disclaimer: This article is for general information and does not replace medical advice, diagnosis or therapy. Self-measurement is a valuable addition, but does not replace the medical assessment. Persistently elevated or strongly fluctuating values should be clarified medically. Do not stop a prescribed blood pressure therapy on your own. With very high blood pressure with symptoms (severe headache, visual disturbances, chest pain, neurological deficits), call 112 immediately (in the US: 911). Last updated: May 2026.
