Blood pressure cuffs – choosing the right size matters

People are different, and so are their (upper) arms. Just as people need different clothing sizes, they also need different sizes of blood pressure cuffs. The cuff must fit to ensure accurate readings. If it does not, the readings may be inaccurate.

The standard cuffs supplied with blood pressure monitors have a length and width that fit many people. However, if the user has a very large or very small upper arm circumference, a larger or smaller cuff must be selected. The cuff must fit snugly around the upper arm. It must not be too loose or too tight, and the inflatable part must be long enough, but not too long. The width must also be appropriate. Common standard cuffs are usually 12-13 cm wide. However, for an upper arm circumference of 33 cm or more, cuffs measuring 15-18 cm in width, or wider if necessary, are recommended.

For very slim arms, a correspondingly smaller and, if necessary, narrower cuff should be selected. Sometimes a pediatric cuff is the right choice.

How are the results distorted?

For people with a very slender arm, the standard cuff may be too large. This may result in readings that are too low. In one study, when an oversized cuff was used, systolic readings were too low by an average of 3.8 mmHg and diastolic readings by an average of 1.5 mmHg.

If the cuff used is too small for the arm inside it, the opposite happens: the readings may be falsely elevated. The less suitable the cuff used, the greater the deviations. In the study, systolic readings were 3.8 mmHg too high and diastolic readings 1.5 mmHg too high for upper arms that would require a size L cuff. If a size XL cuff would have been appropriate, the systolic reading was up to 19.7 mmHg too high. For diastolic readings, the upward deviation was up to 7.4 mmHg.

Upper arms may be too large for a standard blood pressure cuff for various reasons. Being overweight or obese is often the cause, but very muscular arms may also require a larger cuff.

Special case: lipoedema

Lipedema is a special case. This chronic disease is a fat distribution disorder involving an abnormal increase in subcutaneous fatty tissue, which can also affect the arms. As a result, the upper arm circumference can be very large. In addition, the tissue changes often make blood pressure measurement very painful and can cause bruising. Careful consideration must be given to which measuring device may be suitable, and it should be tested individually whether the measurement can be tolerated. Unfortunately, blood pressure monitors are not yet tested for their suitability for people with this condition.

Wrist blood pressure monitor

If taking a measurement with an upper arm blood pressure monitor is not possible, a wrist blood pressure monitor may be an alternative, provided that the user is not known to have arteriosclerosis. This could narrow the relatively finer blood vessels in the wrist and thus distort the measurement. If a wrist monitor is chosen, meticulous care must be taken to perform the measurement correctly in order to obtain accurate results. Due to their design, wrist monitors offer a limited selection of different cuff lengths and widths. However, there are sometimes minor differences between individual devices, so there is still some choice.

Conclusion

It is therefore advisable to measure your arm circumference before purchasing a blood pressure monitor and then specifically look for a device that comes with a suitable cuff. Various manufacturers offer additional cuff sizes as options for their upper-arm blood pressure monitors. For wrist blood pressure monitors, additional cuff sizes are rarely available due to the design of the devices. However, sizes may vary slightly here as well, so it may be possible to find a suitable device. Please note, however, the exclusion criteria for taking measurements at the wrist. If such a device is suitable for you, please also make sure that you take the measurement correctly, with the measurement site at heart level.

Sources:

This article is from Tensana – the leading app since 2011, helping hundreds of thousands of people monitor their blood pressure every day. Our content is based on carefully researched, evidence-based data and is continuously updated (as of 11/2025).

Author Sabine Croci is a qualified medical assistant with many years of experience in internal medicine and cardiology practices as well as outpatient care, and has headed the specialist editorial team at Tensana since 2015. Thanks to her extensive additional qualifications as an emergency medical technician, first responder, and in various areas of therapy and emergency care, she provides well-founded, practical, and reliably verified information.

We hope you found the article helpful. Accurate measurements are essential for good blood pressure control. Our app Tensana can help with that. Clear instructions walk you through taking measurements according to current guidelines. The app can also remind you if you wish. These features are fully available in the free version as well. Get the free app now.