15-20 vs. 20-30 mmHg: Which Compression Level Do I Need?

Compression stockings come in different strengths, measured in mmHg (millimeters of mercury). The number tells you how much pressure the garment puts on your leg at the ankle, easing off as it goes up. Picking the right level makes a big difference in how well they work and how comfortable they feel. Here is a simple guide to the two most common levels.

15-20 mmHg: everyday support

15-20 mmHg is moderate compression. Most people can wear it without a prescription, and it is the level many people start with. It is often a good fit for:

• Tired, achy or heavy legs at the end of the day

• Mild ankle and foot swelling

• Spider veins or mild varicose veins

• Pregnancy, when legs swell and feel heavy

• Long flights or car rides, to help with swelling and lower the risk of blood clots

• Nurses, teachers, retail and factory workers, and anyone who stands or sits for long shifts

• Workouts, running and recovery

20-30 mmHg: firm, medical-grade support

20-30 mmHg is firmer and is usually recommended by a doctor or therapist for a specific condition, such as:

• Moderate varicose veins or ongoing swelling (edema)

• Mild lymphedema or lipedema

• After vein procedures, or after a blood clot (DVT), when your doctor recommends it

• Swelling that 15-20 mmHg has not controlled

Higher levels (30-40 mmHg and up), custom garments and compression pumps are used for more advanced lymphedema and venous disease. If that sounds like you, see our custom garments and compression pumps pages.

Check with your doctor first if…

• You have diabetes, neuropathy, or poor circulation in your legs (peripheral arterial disease)

• You have heart failure or skin wounds on your legs

• Your swelling is new, getting worse, or only in one leg

Get care right away if one leg suddenly becomes swollen, painful, warm or red, or if you have chest pain or trouble breathing. These can be signs of a blood clot.

Getting the right size

Compression only works if it fits. Sizing is based on your measurements, not your shoe size. For the best fit:

1. Measure first thing in the morning, before swelling builds up.

2. Measure the narrowest part of your ankle, just above the ankle bone.

3. Measure the widest part of your calf.

4. For knee highs, measure from the floor to the bend of your knee while seated with your foot flat. For thigh highs or pantyhose, also measure the widest part of your thigh and the length from the floor to the top of the thigh.

5. Compare your numbers with the manufacturer's size chart. If you fall between sizes, or your calf is large for your ankle size, ask about full-calf or petite options.

Local? Get measured and get it right the first time

If you live near Kalamazoo, Battle Creek, Grand Rapids or Lansing, our team can measure you and help you choose the right style and strength. Getting fitted helps you avoid the wrong size, saves time on returns, and makes sure your garment does its job. Contact us to set up a fitting.

Shop compression stockings

Browse knee highs, thigh highs and pantyhose in both 15-20 and 20-30 mmHg in our Stockings & Legwear shop, including sheer, opaque, athletic and men's styles.

This article is for general information and is not medical advice. Talk with your doctor about the compression level that is right for you.