#3 Guard Size — 10mm (3/8") Buzz Cut
Complete guide to #3 guard size: exact measurements, maintenance schedule, and styling tips. See how many millimeters is a #3 guard and whether it's right for your style.

Guard Number
#3
Millimeters
10 mm
Inches
3/8"
#3 Guard Characteristics
Scalp Visibility:
Moderate scalp visibility
Maintenance:
Every 2-3 weeks
Best For:
Balanced style
Common Questions
A #3 guard is exactly 10 millimeters or 3/8" inches in length.
Compare with adjacent lengths
Not sure if #3 is right? Compare with nearby guard sizes: