Yes, blood pressure can be measured on your leg, and it’s a well-established clinical practice. Healthcare providers typically do this at one of two sites: the thigh (using the artery behind the knee) or the ankle (using the arteries near the inner ankle bone or the top of the foot). Leg readings aren’t interchangeable with arm readings, though. Systolic pressure measured at the calf runs about 15 mmHg higher than an arm reading on average, so the numbers need to be interpreted differently.
When Leg Measurement Is Necessary
The upper arm is the standard site for blood pressure, but sometimes it simply isn’t available. Fractures, wounds, IV lines, dialysis shunts, surgical dressings, and severe swelling from lymphedema can all make it impossible to place a cuff on either arm. People with limb differences or amputations may also need an alternative site. In rarer cases, narrowing of the arteries that supply the arms (from conditions like Takayasu’s arteritis or advanced atherosclerosis) can make arm readings unreliable, and the leg becomes the better option.
Two Sites: Thigh and Ankle
The British and Irish Hypertension Society recommends ankle measurements over thigh or calf whenever possible. Ankle cuffs are easier to fit, especially on larger patients, and cause less discomfort during inflation. That said, thigh measurement is still used in certain clinical situations.
For a thigh reading, the cuff goes on the lower third of the thigh, about one inch above the crease of the knee. The healthcare provider listens with a stethoscope placed behind the knee, over the popliteal artery. For an ankle reading, the cuff wraps just above the ankle bones, and the provider locates a pulse either on the top of the foot (the dorsalis pedis artery) or just behind the inner ankle bone (the posterior tibial artery). A handheld Doppler device is often used at the ankle because these pulses can be faint and hard to hear with a regular stethoscope.
Why the Numbers Run Higher
If you’ve ever had your blood pressure taken on your leg, you may have noticed the systolic number (the top number) was noticeably higher than what you’re used to seeing. In a study comparing arm and calf readings, the average arm systolic was about 128 mmHg while the calf came in around 143 mmHg. That roughly 15-point difference is normal and has to do with how blood pressure waves amplify as they travel further from the heart through narrower arteries. Your provider accounts for this gap when interpreting the result.
This difference is also why leg readings shouldn’t be plugged directly into treatment decisions meant for arm-based numbers. If your blood pressure is being monitored over time, consistency matters. Switching between arm and leg sites without noting the change can make it look like your pressure jumped or dropped when it didn’t.
Cuff Size Makes a Big Difference
Using the wrong cuff size is one of the most common sources of inaccurate readings, and this is especially relevant for leg measurements. A standard adult arm cuff has a bladder measuring about 13 x 30 cm. A thigh cuff is significantly larger, typically 20 x 42 cm. If the cuff is too small for the limb, it will overestimate your blood pressure. If it’s too large, it can underestimate it. This is one reason leg measurements are best done in a clinical setting with properly sized equipment rather than at home with a standard arm monitor strapped to your thigh.
Leg Pressure as a Diagnostic Tool
Comparing leg and arm blood pressure isn’t just a workaround for when arms are unavailable. It’s actually the basis of an important screening test called the ankle-brachial index, or ABI. This test divides your ankle systolic pressure by your arm systolic pressure to check for peripheral artery disease (PAD), a condition where narrowed arteries reduce blood flow to your legs.
A normal ABI falls between 1.0 and 1.4, meaning your ankle pressure is equal to or slightly higher than your arm pressure. A borderline result is 0.90 to 0.99, suggesting early narrowing. An ABI below 0.90 indicates PAD. The American Heart Association recommends a specific order for this test: one arm first, then the ankle on the same side, then the opposite ankle, then the opposite arm. This sequence helps ensure consistent readings.
If your leg pressure is unexpectedly low compared to your arm, that’s a red flag for blocked or narrowed arteries in the legs. Conversely, if your leg pressure is abnormally high (ABI above 1.4), it can signal stiff, calcified arteries, which is common in people with diabetes or chronic kidney disease.
Accuracy Limitations
Leg blood pressure is a useful backup, but it’s not as reliable as arm measurement. Research in critical care settings has found that for the most dependable readings, the arm should be used whenever possible. Thigh and calf measurements introduce more variability, partly because larger limbs make cuff fit less consistent and partly because the arteries being compressed are deeper under tissue.
Pain during cuff inflation is another concern. If inflating the cuff causes enough discomfort to raise your blood pressure reactively (a spike of more than 5 mmHg), the reading becomes unreliable. This is more likely with thigh cuffs, which require higher inflation pressures. Conditions that affect blood flow in the legs, like deep vein thrombosis, recent surgery, or significant peripheral artery disease, can also make leg readings inaccurate or inappropriate.
For routine home monitoring, an arm cuff remains the best choice. But if you’ve been told your arm readings aren’t reliable, or if a provider measures your leg pressure during an exam, the results are clinically meaningful when interpreted with the right context.