To measure for support hose, you need a soft measuring tape, bare legs, and ideally a morning timeslot before any swelling sets in. The process takes just a few minutes, but accuracy matters: poorly fitted compression stockings can cause skin irritation, nerve numbness, or even act as a tourniquet that restricts blood flow instead of improving it.
Why Morning Measurements Matter
Your legs swell throughout the day. Prolonged sitting or standing slows circulation and allows fluid to pool in your lower legs and ankles, sometimes adding noticeable volume by evening. Measuring when your legs are already swollen means you’ll end up with stockings that fit a temporarily enlarged leg, and they’ll be too loose once the swelling goes down. Too-loose stockings deliver less compression than the label promises, and too-tight ones can dig into your skin or roll down and create dangerous pressure bands.
Take your measurements first thing in the morning, right after getting out of bed, before gravity has had time to pull fluid downward. If morning isn’t possible, at least avoid measuring after a long stretch of standing or sitting.
What You Need
All you need is a soft, flexible measuring tape (the kind used for sewing, not a rigid metal one) and a pen to record your numbers. Measure on bare skin, not over pants or socks, and keep both feet flat on the floor while you measure. Having someone help you is useful since bending down to wrap a tape around your own ankle can shift your body position and throw off the reading.
How to Measure for Knee-High Support Hose
Knee-high stockings are the most common style, and they require two types of measurement: circumference (how big around your leg is at specific points) and length (how long the stocking needs to be).
Ankle Circumference
Find the narrowest part of your ankle, just above the ankle bone. Wrap the tape snugly around this spot without pulling it tight enough to compress the skin. Write down the number. This is the most important measurement because compression levels are calibrated based on ankle pressure. Even a half-inch error here can put you in the wrong size.
Calf Circumference
Wrap the tape around the widest part of your calf muscle. For most people, this is roughly halfway between the ankle and the knee. Record the number.
Length
Make a small mark on your skin just above the ankle bone, then make a second mark just below the bend of your knee. Measure the distance between those two marks with your leg straight and your foot flat on the floor. This tells you how long the stocking needs to be so it sits about two finger-widths below your knee crease, where it won’t bunch or dig in when you bend your leg.
Measuring for Thigh-High or Full-Length Hose
If you need thigh-high stockings or pantyhose-style compression garments, you’ll take the same ankle and calf measurements described above, plus two additional ones. Measure the circumference of your thigh at its widest point, usually about mid-thigh or just below the groin depending on the brand’s sizing chart. Then measure the full length from the floor (or from your ankle mark) to that thigh point while standing straight.
Some thigh-high brands also ask for a measurement at the knee itself, taken with your leg slightly bent. Check the sizing chart on the specific product’s packaging before you order, since the required measurement points vary between manufacturers.
Using Your Measurements to Find Your Size
Most compression stocking packaging includes a sizing chart that maps your circumference and length measurements to a specific size (small, medium, large, or numbered sizes). Your ankle measurement is the primary driver. If your ankle measurement falls into one size but your calf measurement falls into another, most manufacturers recommend sizing up. A stocking that’s slightly less snug at the ankle is safer than one that’s too tight around the calf, which can create a band of high pressure and restrict circulation.
Don’t assume your size is the same across brands. Sizing charts differ, so re-check your measurements against the chart every time you try a new brand.
Choosing the Right Compression Level
Support hose come in several pressure levels measured in millimeters of mercury (mmHg), and the right level depends on what you’re using them for.
- Under 20 mmHg (low compression): Suitable for mild leg fatigue, minor swelling from long days on your feet, and general comfort during travel. These are widely available over the counter and don’t require a prescription.
- 20 to 30 mmHg (medium compression): The most commonly prescribed range for moderate swelling, varicose veins with symptoms, and preventing blood clots during long flights. A study of airline passengers over age 50 found that wearing stockings in this range during flights longer than eight hours significantly reduced the risk of symptomless deep vein clots.
- 30 to 40 mmHg (high compression): Used for more serious venous conditions, including healing venous ulcers and managing post-thrombotic syndrome after a deep vein clot. Research shows this level is more effective than lower ranges for ulcer healing and preventing recurrence. These typically require a prescription.
A meta-analysis of 11 trials found that stockings in the 15 to 20 mmHg range improved swelling and symptoms compared to very light compression or none at all. Higher isn’t always better for everyone, though. The general principle is to wear the highest level you can comfortably tolerate, but your doctor or vascular specialist should guide that decision if you’re managing a diagnosed condition.
What Happens if the Fit Is Wrong
Ill-fitting support hose aren’t just uncomfortable. They can cause real problems. The most common issues are skin irritation and discomfort, but the more serious risk comes from stockings that slip down or roll at the top, creating a tight band around one part of your leg. This tourniquet effect can restrict blood flow, cause localized swelling below the band, and in rare cases lead to skin breakdown, nerve damage with numbness or tingling, or even superficial blood clots in varicose veins compressed by the rolled edge.
Two superimposed stockings worn continuously (day and night) have been linked to skin damage at pressure points like the back of the knee and the heel. If your stockings leave deep indentations, cause tingling or numbness, or turn your toes blue or white, take them off and get remeasured.
When to Remeasure
Your legs don’t stay the same size forever. Weight gain, weight loss, reduced swelling from treatment, pregnancy, and aging all change your leg dimensions. Get remeasured any time you notice your stockings fitting differently, whether they feel looser or tighter than before. As a baseline, an annual check is reasonable to confirm your stockings still match your legs and that compression therapy is still appropriate for your circulation. Compression garments also lose elasticity over time, typically after three to six months of daily wear, so replacing them on schedule matters as much as the original fit.