How to choose mmHg (compression level)

What mmHg means

mmHg (millimetres of mercury) describes how much pressure a sock is designed to apply. Higher numbers mean firmer compression. Ranges on consumer packs are often approximate and brand-specific.

Common consumer ranges (illustrative)

• Around 8–15 mmHg — light / everyday comfort for many people
• Around 15–20 mmHg — moderate; often marketed for travel and all-day wear
• Around 20–30 mmHg — firmer; sometimes used under clinician advice
• Higher than ~30 mmHg — typically medical territory; do not self-prescribe

These bands are a rough map, not a prescription. If you have a health condition, ask a professional before buying firmer classes.

Choosing without the hype

1. Start with why you want them (travel, sport, standing work)
2. Prioritise a size chart over "one size" claims
3. Prefer clear mmHg labelling over vague "firm support" wording
4. If pregnant, or if you have vascular or nerve issues, get personal advice first

Fabric and build

Look for durable knit, a comfortable toe and heel, and a cuff that stays up without digging. Moisture-wicking fabrics help for sport; opaque or sheer styles are preference for workwear.

Next steps

Once you have a sense of mmHg, check the sizing guide so the pressure lands where it should. New to the topic? Start with what compression socks are. Travellers may prefer our travel and flights notes.