Measure around the middle of your bare upper arm with a tape measure, then match that number to the chart below. A cuff that is too small squeezes harder than it should and pushes your reading up, which is one of the most common reasons a reading at home does not match the one at the clinic. Getting this right matters more than which monitor you buy.
Reviewed 19 August 2026. Cuff ranges are taken from the manufacturer specifications listed on the AMA Validated Device Listing.
Take your arm out of your sleeve. Do not roll the sleeve up, because a bunched sleeve squeezes the arm above the cuff.
Let your arm hang loose at your side, relaxed.
Find the middle of your upper arm, halfway between the tip of your shoulder and the point of your elbow.
Wrap a tape measure around your bare arm at that point. Snug against the skin, not tight enough to press in.
Write the number down in inches or centimetres, then read the chart below.
No tape measure? Use a strip of paper or a piece of string, mark where it meets, then hold it against a ruler. That works and it costs nothing.
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Measure around the middle of your bare upper arm, then type it in. It runs in your browser and your measurement is not sent anywhere.
Type your measurement and the matching cuff size appears here.
Not sure how to measure? The full method is here. Arm bigger than 17.7 in (45 cm)? Read this first.
You cannot pick a cuff size until you have measured your arm, and measuring your own upper arm with an ordinary tape takes two hands you do not have. This one hooks to itself and locks, so you can do it alone.
It is a tape measure, nothing more. A strip of paper and a ruler works too, and costs nothing. Buy this only if you would rather not fiddle.
Check the MyoTape body tape measure on AmazonMatch your arm measurement to a row. Ranges overlap on purpose, because different makers cut their cuffs slightly differently.
| Cuff size | Arm, inches | Arm, cm |
|---|---|---|
| Small adult | 6.3 to 9.4 in | 16 to 24 cm |
| Adult | 9.0 to 14.6 in | 23 to 37 cm |
| Wide range | 8.6 to 16.5 in | 22 to 42 cm |
| Large adult | 12.2 to 17.7 in | 31 to 45 cm |
| Extra large | 16.9 to 22.0 in | 43 to 56 cm |
Most monitors sold today include a wide range cuff, which covers 8.6 to 16.5 in (22 to 42 cm). That fits a lot of adults, and it is why one cuff is often enough. If your measurement sits near either end of that range, look for a monitor that sells a separate cuff in your size.
A standard cuff will be loose on you and the reading will drift. You want a small adult cuff, 6.3 to 9.4 in (16 to 24 cm). Some monitors sell one separately. One validated model ships with it already in the box, which saves the guesswork.
Model UA-651SAC
This one ships with the small cuff already in the box. If your arm measures under about 9.4 in (24 cm), a standard cuff will read high on you, and this solves that on day one.
Why it is on this list
Cuff sizes
The trade off
Only useful if your arm is genuinely small. Measure first. On a normal size arm this cuff will be too tight and will read high.
Check the UA-651SAC on AmazonAffiliate link. It opens the UA-651SAC listing on Amazon. We earn a commission if you buy, at no extra cost to you.
This is where home monitoring most often goes wrong, because the cuff in the box stops at 16.5 in (42 cm) and people use it anyway. If your arm is bigger than the cuff range, the number you get is not usable.
Two things work, in this order.
Add a large cuff to a validated monitor. The A&D Medical monitors on our list take a separate large cuff covering 12.2 to 17.7 in (31 to 45 cm). The monitor stays the validated one. You just fit it with a cuff that reaches around your arm.
Above 17.7 in (45 cm), it gets harder. Extra large cuffs going up to about 22 in (56 cm) exist, and there is a specific model worth knowing about, but no monitor has cleared our check at that size yet. We wrote the whole thing up, including how much a too-small cuff actually costs you in mmHg.
Both reach 17.7 in (45 cm). They are made by A&D, the same company that makes the monitor, and A&D names the compatible models itself. We do not list third party cuffs sold as “compatible with” a brand. A cuff that reads long turns a validated monitor into an unvalidated one and you would never know.
Fits arms 12.2 to 17.7 in (31 to 45 cm)
The large cuff for the UA-651 and the UA-651SAC. Your monitor stays the validated one. Only the cuff changes.
A&D Medical names these monitors: UA-651, UA-651SAC. Check your own model number before you buy.
A&D does not name the UA-767F in this cuff’s compatibility list. If yours is the UA-767F, use the UA-291 below instead.
Check the UA-291A on AmazonFits arms 12.2 to 17.7 in (31 to 45 cm)
The large cuff A&D names for the UA-767F, the multi user monitor on our list. Same arm range as the UA-291A, different compatibility list.
A&D Medical names these monitors: UA-651, UA-767F. Check your own model number before you buy.
A&D does not name the UA-651SAC here. If yours is the UA-651SAC, use the UA-291A above.
Check the UA-291 on AmazonYou can search the AMA Validated Device Listing yourself and filter by cuff size. It is free, and it is the same list we used.
Measure around the middle of your bare upper arm, halfway between your shoulder and your elbow. Under 9.4 in (24 cm) needs a small adult cuff. About 9 to 14.6 in (23 to 37 cm) is a standard adult cuff. Many monitors now ship a wide range cuff covering 8.6 to 16.5 in (22 to 42 cm). Above that you need a large or extra large cuff.
It reads high. A cuff that does not wrap far enough around your arm has to squeeze harder to stop the blood flow, and the monitor records that extra effort as higher pressure. This is one of the most common reasons a home reading disagrees with the reading taken at a clinic.
It tends to read low, though the effect is usually smaller than the effect of a cuff that is too small. Either way the reading is not trustworthy, so it is worth getting the size right rather than guessing.
Let your arm hang loose at your side. Find the midpoint between the tip of your shoulder and the point of your elbow. Wrap a tape measure around your bare arm at that point, snug but not tight, and read the number. Use that measurement, not your shirt size.
Only if your arm measurement falls inside that cuff range. Cuffs print their range on the cuff itself, and there are index lines that show whether it fits when you wrap it. If your arm falls outside the printed range, the reading is not reliable.
Yes. Put the cuff on a bare upper arm. A rolled up sleeve bunched above the cuff squeezes the arm and can change the reading, so take your arm out of the sleeve instead of pushing it up.
BP Central keeps a record of readings you enter yourself. It does not measure your blood pressure and it is not medical advice. One reading at home does not diagnose anything. Only a doctor or other health professional can do that.
Once the cuff fits, the readings are worth keeping. BP Central organises them and works out your averages.
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