Do Birkenstocks Run Big? A Guide to Sizing and Fit

A top-down view of various Birkenstock sandals in different sizes arranged on a wooden floor, with a measuring tape beside them.

Understanding Birkenstock Sizing

Birkenstocks have become a staple in comfortable footwear, known for their unique design and orthopedic benefits. While they typically run true to size, their unique sizing system can be confusing for first-time buyers. The brand offers both regular and narrow width options, labeled as:

  • Regular width: ⚫️ or R
  • Narrow width: ⚪️ or N

Size Conversion Chart

US Women'sUS Men'sEU Size
6-6.54-4.537
7-7.55-5.538
8-8.56-6.539
9-9.57-7.540
10-10.58-8.541

Factors Influencing Fit

  1. Footbed Design: Birkenstocks feature a contoured footbed that molds to your foot's shape over time.
  2. Width Options: Available in regular and narrow widths to accommodate different foot types.
  3. Material Differences:
    • Leather straps will stretch slightly
    • Birko-Flor and EVA materials maintain their original size
    • Suede footbed liners may feel snugger initially

How to Find Your Perfect Fit

  1. Measure Your Foot: Use a ruler or measuring tape to measure foot length from heel to toe. Compare with the Birkenstock size chart.

  2. Check Proper Fit Indicators:

    • Feet should sit comfortably in the heel cup
    • Allow 1/4 inch space at both heel and toe
    • Toe bar should align with toe base
    • Sides of feet shouldn't touch or hang over edges

"Birkenstocks are like a good wine - they get better with time." - Common saying among Birkenstock enthusiasts

Breaking In Period and Care

The break-in period typically lasts 1-2 weeks, during which the cork footbed molds to your unique foot shape. To maintain proper fit:

  • Clean regularly with a damp cloth
  • Use cork sealer every 6 months
  • Store in a cool, dry place
  • Avoid extreme heat exposure

When to Adjust Sizing

Size Up If:

  • You're between sizes
  • You prefer wearing socks
  • You have wide feet

Size Down If:

  • The shoes feel loose after trying them on
  • You have narrow feet
  • You prefer a snug fit

Common Sizing Mistakes

  • Choosing based on US size alone
  • Ignoring width options
  • Not adjusting straps properly
  • Not considering sock thickness

For the most accurate fit, visit an authorized Birkenstock retailer for a professional fitting, or check the official Birkenstock website for detailed guidance. Many online retailers offer free returns, making it easier to find your perfect size through trial and error.


Remember that Birkenstocks should feel roomy initially, as the footbed will conform to your feet over time. The key is finding the right balance between comfort and proper support.