#1 Guard Size — 3mm (1/8") Buzz Cut
Complete guide to #1 guard size: exact measurements, maintenance schedule, and styling tips. See how many millimeters is a #1 guard and whether it's right for your style.

Guard Number
#1
Millimeters
3 mm
Inches
1/8"
#1 Guard Characteristics
Scalp Visibility:
Higher scalp visibility
Maintenance:
Every 1-2 weeks
Best For:
Clean, sharp look
Common Questions
A #1 guard is exactly 3 millimeters or 1/8" inches in length.
Compare with adjacent lengths
Not sure if #1 is right? Compare with nearby guard sizes: