Ear Piercing Stud Sizes Explained: Gauge, Length & Millimeters Made Simple

What Are Gauge Sizes in Ear Piercing Studs?

Gauge represents the thickness of the post. The lower the number, the thicker the jewelry.
Most ear piercing studs come in these common gauges:

• 18G (1.0 mm) – typically used for lobe piercings
• 16G (1.2 mm) – standard for cartilage such as helix, tragus, conch
• 20G (0.8 mm) – used for traditional butterfly-back earrings

Choosing the correct gauge helps prevent irritation, migration, and difficulty inserting jewelry later.

Understanding Post Length: Millimeters That Actually Matter

Post length determines how comfortably the stud sits in your ear.
The most common lengths are:

• 6 mm (0.24″) – ideal for healed lobes and tight placements
• 7–8 mm (0.27″–0.31″) – recommended for most cartilage piercings
• 9–10 mm (0.35″–0.39″) – suitable for swelling or thicker cartilage

A post that’s too short causes pressure and delayed healing. One that’s too long may snag on hair or clothing.

Why These Measurements Are Important

Correct size = safer healing, better comfort, and a cleaner look.
Using the right gauge and millimeter length helps:

• Minimize irritation
• Avoid embedding
• Keep the stud straight
• Improve long-term wearability, especially with flat-back designs

How to Pick the Right Fit

If your piercing is healing, cartilage tends to swell — so slightly longer lengths (7–8 mm) are safer.
For everyday wear, choose:

• 18G 6 mm for lobes
• 16G 7–8 mm for helix, tragus, rook, conch
• Flat backs for maximum comfort, especially during sleep

If unsure, always consult your piercer or choose the next size up and adjust later.